Homework

Assigment 1: Foundations: Atoms, Molecules, and Ions 1. 1 A 47. 3-mL sample of ethyl alcohol (ethanol) has a mass of 37. 32 g. What is its density? 1. 2 If 116 g of ethanol is needed for a chemical reaction, what volume of liquid would you use? The density of ethanol is 0. 789 g/mL 1. 3 Battery acid is 40. 0% sulfuric acid, H2SO4, and 60. 0% water by mass. Its density is 1. 31. Calculate the mass of pure H2SO4 in 100. 0 mL of battery acid. 1. 4 How many moles of atoms does 136. 9 g of iron metal contain? 1. 5 A stack of 500 sheets of typing paper is 1. inches thick. Calculate the thickness, in inches and in miles, of a stack of typing paper that contains one mole (Avogadro’s number) of sheets (1 inch = 2. 54 cm) 1. 6 Compounds containing sulfur and oxygen are serious air pollutants; they represent the major cause of acid rain. Analysis of a sample of a pure compound reveals that it contains 50. 1% sul- fur and 49. 9% oxygen by mass. What is the simplest formula of the compound ? 1. 7 A 20. 882-gram sample of an ionic compound is found to contain 6. 072 grams of Na, 8. 474 grams of S, and 6. 336 grams of O. What is its simplest formula? 1. 8 Hydrocarbons are organic compounds composed entirely of hydrogen and carbon. A 0. 1647-gram sample of a pure hydrocarbon was burned in a C-H combustion train to produce 0. 4931 gram of CO2 and 0. 2691 gram of H2O. Determine the masses of C and H in the sample and the percentages of these elements in this hydrocarbon. 1. 9 A 0. 1014-g sample of purified glucose was burned in a C-H combustion train to produce 0. 1486 g of CO and 0. 0609 g of H2O. An elemental analysis showed that glucose contains only carbon, hydrogen, and oxygen. Determine the masses of C, H, and O in the sample and the percentages of these elements in glucose. 1. 10 Phosphorus, P4, burns with excess oxygen to form tetraphosphorus decoxide, P4O10. In this reaction, what mass of P4 reacts with 1. 50 moles of O2? 1. 11 What mass of CO2 could be formed by the reaction of 16. 0 g of CH4 with 48. 0 g of O2? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com 1. 12 What is the maximum mass of Ni(OH)2 that could be prepared by mixing two solutions that contain 25. g of NiCl2 and 10. 0 g of NaOH, respectively? NiCl2 + NaOH — > Ni(OH)2 + NaCl 1. 13 A 15. 6-gram sample of C6H6 is mixed with excess HNO3. We isolate 18. 0 grams of C6H5NO2. What is the percent yield of C6H5NO2 in this reaction? 1. 14 Phosphoric acid, H3PO4, is a very important compound used to make fertilizers. It is also pres- ent in cola drinks. H3PO4 can be prepared in a two-step process. Rxn 1: P4 +O2 — > P4O10 Rxn 2: P4 O10 +H2O — > H3PO4 We allow 272 grams of phosphorus to react with excess oxygen, which forms tetraphosphorus decoxide, P4O10, in 89. % yield. In the second step reaction, a 96. 8% yield of H3PO4 is obtained. What mass of H3PO4 is obtained? 1. 15 2. 00 grams of ammonium sulfate was dissolved in distilled water and made up to 250 mL in a volumetric flask. A 25. 0 mL portion of this solution was boiled with 50. 0 mL of 0. 100 M sodium hydroxide solution until no more ammonia gas was evolved. Then excess sodium hydroxide in the resulting solution required for neutralization, 24. 30 mL of HCl 0. 100M. Calculate the percentage purity of the sample. 1. 16 Write the correct formulae/ions for: Potassium sulfite:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Dinitrogen pentoxide:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Nitrorous acid: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Sodium hyperchlorite†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Chloric acid†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Hydride ion:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Coprous ions: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Mercuric ion†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1. 17 In acidic solution, dichromate ion will oxidize ferrous ion to ferric ion and form chromate (III) ion. What volume of 0. 100 M dichromate ion is required to oxidize 60. 0 mL of 0. 250 M of ferrous ion? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com Homework Lesson 1 asdf jkl ; asdf ; jkl ; asdf jkl ; asdf jkl ; asdf ; jkl ; asdf jkl ; asdf jkl ; asdf ; jkl ; asdf jkl ; asdf jkl ; asdf ; jkl ; asdf jkl ; fff jjj fff jjj fff jjj ff jj ff jj f j fff jjj fff jjj fff jjj ff jj ff jj f j ddd kkk ddd kkk ddd kkk dd kk dd kk d k ddd kkk ddd kkk ddd kkk dd kk dd kk d k sss lll sss lll sss lll ss ll ss ll s l sss lll sss lll sss lll ss ll ss ll s l aaa ;;; aaa ;;; aaa ;;; aa ;; aa ;; a ; aaa ;;; aaa ;;; aaa ;;; aa ;; aa ;; a ; ff jj dd kk ss ll aa ;; f j d k s l a ; ff jj dd kk ss ll aa ;; f j d k s l a ; sad sad fad fad ask ask lad lad dad dad s; as; fall fall alas alas flask flask aaa ddd sad sad aaa sss lll lll all all aaa ddd sad sad aaa sss lll lll all all aaa sss ;;; as; as; ddd aaa ddd dad dad aaa sss ;;; as; as; ddd aaa ddd dad dad f fl fla flas flask ; l la las lass lass f fl fla flas flask; l la las lass lass f fa fal fall falls; a al ala alas alas f fa fal fall falls; a al ala alas alas Lesson 2 Ff jj dd kk ss ll aa ;; f j d k s l a ; Adds adds fads fads asks asks lads lads Jjj jhj jhj hjh jhj jjj jhj jhj hjh jhj Jhj ash ash jhj had has jhj had had jhj Jhj ash ash jhj has has jhj had had jhj Jhj a lass has ; adds a half ; a lad had ;Has a slash ; half a sash dad shall dash Ddd ded ded ede ded ddd ded ded ede ded Ded lef lef ded she she ded he ; ded he ; Ded he lef; she fell ; he slashes sales; He sees sheds ahead; she sealed a lease Ll lol lol olo lol lll lol lol olo lol Lol odd odd lol hoe hoe lol fo foe lol Load sod ; hold a foe ; old oak hoes ; lol She sold odd hooks ; he folded old hoses Ddd ded ede ded ddd ded ded ede ded Lll lol lol olo lol lll lol lol olo lol Jjj jhj jh jhjh jhj jjj jhj jhj jhj hjh jhj She has old jokes ; he has a half a salad ; Heed jade hoof elf; hash folk head hole Seed lake look jell sas hold dead halfHeed heed feed feed deed deed seed seed Jade jade fade fade fake fake lake lake Hoof hoof hood hood hook hook hook look look Elf ; elf ; self self sell sell jell jell Hash hash lash lash dash dash sash sash Folk folk fold fold sold sold hold hold Head head heal heal deal deal dead dead Hole hole hale hale hall hall half half Asdf jkl ; heo asdf jkl l heo asdf jkl ; Jade jade fake fake held held lose lose Jjj jmj jmj mjm jmj jjj jmj jmj mjm jmj Jmj mom mom jmj mad mad jmj ham ham jmj Jmj make a kam l fold a hem l less flame ; Messes make some moms mad ; half a dome ; Fff frf frf rfr frf fff frf frf rfr frfFrf far far frf for for frf err err frf frf more rooms ; for hrt mstkd ; from me He reads ahead l more are far ajar Kkk kik kik iki kik kkk kik kik kik iki kik Kik dim dim kik lid lid kik rim rim kik Kik If she did ; for his risk ; old mill ; More mirrors l his middle silo is filled Jjj jmj mjm jmj jjj jmj jmj mjm jmj Fff frf frf rfr frf fff frf frf rfr frf Kkk kik kik iki kik kkk kik kik iki kik He did l his firm red desk lef is a joke Joke ride sale same roam aims sire more Jars aide dark lame foal elms hire mare Joke joke jade jade jams jams jars jars Ride ride h ide hide hide side aide aide Sale sale dale dale dare dare dark darkSame same fame fame dame dame lame lame Roam roam loam foam foam foal foal aims aims arms arms alms alms elms elms Sire sire dire dire dire dire hire hire More more mire mire mere mare mare Lesson 3 Warm-up Asdf jkl ; heo ; asdf ; jkl ; heo ; asdf jkl ; Jade jade fake fake held held lose Jjj jmj jmj mjm jmj jjj jmj jmj mjm jmj Jmj mom mom jmj mad mad jmj ham ham jmj Jmj make a jame ; fold a hem ; less flame ; Messes make some moms mad ; halkf a dome ; Fff frf frf rfr fff frf frf rfr frf Frf farfar frf for for frfr err err frf Frf more rooms ; for her marks ; from me ; He reads ahead l more doors are far ajarKkk kik kik iki kik kkk kik kik iki kik Kik dim dim kik lid lid kik rim rim kik Kik if she did ; for his risk ; old mill ; More mirrors ; his middle silo is filled Jjj jmj mjm jmj jjj jmj jmj mjm jmj Ffffrf frf rfr frf fff frf frf rfr frf Kkk kik iki kik kkk kik kik iki kik He did ; his firm red desk lid is a jok e Joke ride sale same roam aims sire more Jars aide dark lame foal elms hire mare Joke joke jade jade jams jams jars jars ride ride hide side side aide aide Sale sale dale dale dare dare dark dark Same same fame fame dame dame lame lame Roam roam loam loam foam foam foal foal Aims aims arms arms alms alms alms elms elmsSire sire dire dire fire fire hire hire More more mire mire mere mere mare mare Lesson 4 F. More sire aims roam same sale ride joke Mare hire elms foal lame dark aide jars More sire aims roam same sale ride joke Mare hire elms foal lame dark aide jars More sire aims roam same sale ride joke Mare hire elms foal lame dark aide jars More sire aims roam same sale ride joke Mare hire els foal lame dark aide jars More sire aims roam same sale ride joke Mare hire elms foal lame dark aide jars More aire aims roam same sale ride joke Mare hire els foal lame dark aide jars More sire aims roam same sale ride jokeMare hire alms foam lame dark aide jars More sire aims fome foal Mo re sire aims roam same sale ride joke Mare hire elms foal lame dark aide jars More more mire mire mere mere mare mare Sire sire dire dire fire fire hire hre Aims aim s arms arms alms alms elms elms Roam roam loam loam foam foal foal Same same fame fame dame dame lame lame Sale sale dale dale dare dare dark dark Ride ride hilde hilde side side aide aide jade made mode mode mole mole Lesson 5 Fff ftf ftf tft ftf fff ftf ftf ftf tft ftf Ftf kit kit ftf toe toe ftf ate ate ftf Ftf it is the ; to them ; for the ; at it ; That hat is flat ; it ate a least threeJjj jnj jnj njn jnj jjj jjj jnj jnj njn jnj Jnj ten ten jnj not not jnj and and jnj Jnj nine tones ; none inside ; on and on ; Nine kind lines ; ten done in an instant Dd dcd dcdc cdc dcd ddd dcd dcd cdc dcd dcd Cdc ace ace can dcd arc arc dcd Dcd on a deck ; in each care ; cannot act ; Cat at once ; call to cancel the tickets Fff ftf ftf tft ftf fff ftf ftf tft ftf Jjj jnj jnj njn jnj jjj jnj jnj njn jnj Ddd dcd dcd cdc dcd ddd dcd dcd cdc dcd The cartoon of jam is here on this dock ; Said farm jets kick this none care ink ; Rain hand jots tick then tone came sink Sail sail said said raid raid rain rainFarm farm harm harm hard hand hand Jets jets lets lets lots lots jots jots Kick kick sick sick lick lick tick tick This this thin thin than than then then None none lone lone done done tone tone Care care cake cake cane cane ca,e came Ink; ink ; link link rink rink sink sink Lesson 6 Ff fvf fvf vfv fvf fff fvf vfv fvf vfv fvf Fvf vie vie fvf eve eve fvf via via fvf Fvf vie for love ; move over ; via a van ; Vote to move ; even vitamins have flavor The draft is too cold. Close this door. Ask Vera to start a fire. Find a match. Dr. T. Vincent sees me ; he made acast. Ash Rd. is ahead ; East Ave. veers leftFf fvf fvf vfv fvf fff fvf fvf vfv fvf ;;; t;; t;; ;;; c;; c;; ;;; s;; s;; ;;; Lll l. l l. l . l l. l lll l. l l. l . l. lll Dee voted for vivid vases on her visit Fold hide fast came hold ride mast fame Hone ri ce mask fade none vice task jade Fff fvf fvf vfv fvf fff fvf fvf vfv fvf ;;; t;; ;;; c;; c;; ;;; s;; s;; ;;; Lll l. l l. l . l. l. l lll l. l l. l . l. lll Dee voted for vivid vases on her visit . Fold hide fast came hold ride mast fame Hone rice mask fade none vice task jade Lesson 7 Fail not ; jest mist chin Rev. card sake Rick did not join ; Val loves that fame. Sss sws sws wsw sws sss sss sws sws wsw swsSss sws sws wsw sws sss sss sws sws wsw sws Sws was was sws own own sws saw saw sws Sws was was sws own own sws saw saw sws Sws white swans swim ; sow winter wheat ; Sws white swans swim ; sow winter wheat ; We watched some whales while we walked We watched some whales while we walked Kkk k,k k,k ,k k,k kkk k,k k,k ,k k,k Kkk k,k k,k ,k k,k kkk k,k k,k ,k k,k K,k it, it, k,k or , or , k,k an, an, k,k k,k it , it, k,k or , or k,k an , an k,k k,k if it id , two, or three , as soon as k,k if it id , two, or three , as soon as Vic , his friend , lives in Rich , Alaska Vic , his frien d , lives in Rich , AlaskaFff fgf fgf gfg fgf fff fgf fgf gfg fgf Fgf leg leg fgf egg egg fgf get get fgf Fgf give a dog , saw a log , sing a song , Gen gets a large sagging gift of games Ss sws sws wsw sws sss sws sws wsw sws Kkk k,k k,k ,k k,k kkk k,k k,k ,k, k,k Fff fgf fgf gfg fgf ggg fgf fgf gfg fgf Wanda watched the team jog to the glen Frank sold sold Dave old an washing mscone. Carl joked with al ice , fran , edith Wamda wore redsocks; sadie wore green Frank sold Dave an old washing machine . Arl jokes with Alice , Fran , and Edith . Arl jokes with Alice , Fran , and Edith . Wanda wore red socks ; Sadie wore green Wanda wore red socks ; Sadie wore greenLesson 8 Memo dock sink wave heed crag jolt jest Tommi Ra has two free carnival tickets Wade Dana Alda Sami Cata Devo Wane Glen Vera Edie Fran Seth Adam Cara Rene Dave Gene Vick Rick Coel Fran Dave Carl Sadi Anna Wade Gino Sali Vida Theo Dean Eric S-me w-rk s- we make the w-orld cleaner. W hav- th-m saf-; V-ra l-ft to s it . See , the –ive-s and st-eams a-e – -ising A damaging c-emical mig-t –arm t-e men. Their –o- -akes ja- and so-e sew ite-s. W-ll-am –s –ll and w-ll l-ve –n Alaska Deloris sold red , tn , nd orchid ties. Dana had dogs , cats , and a tan hamster. Todd ate mangoes , kiwis , and an orange.Alicia worked on math , French , and law. Edie Victor saw the Alo Reed dress too. Tom Salt and Arti Wiggs saw Sam and Di Rick saw Chirs at three Eastmoor games. Donna wrote to Anna , Ellen , and Rachel. Al had one good mark and told me later. We want to go westr to work in the rain. The snow fell one dark night last fall/ Watch the river flow over the dark dam Ring snow west tows ink , glow jot , hag . King scow well down elf , crew mow, sag Ring ring wing wing sing sing king kings snow snow show show stow stow scow scow Werst west went went welt welt welt welt well well West west went went welt welt well wellTows tows town town gown gown down down I nk ink ilk ilk elk elk elf elf Glow glow grow grow grew grew crew crew Jot jot hot hot how how mow mow Hag hag rag rah wah wah sag sag Lesson 9 Dim logo wags jive foal corn them wags Dim logo wags jive foal corn them wags Wanda mailed the jewels that Carl made Wanda mailed the jewels that Carl made Fff fbf fbf bfb fbf fff fbf fbf bfb fbf Fff fbf fbf bfb fbf fff fbf fbf bfb fbf Fbf rob rob fbf ebb ebb fbf bag bag fbf Fbf rob rob fbf ebb ebb fbf bag bag fbf Fbf a net bin , a black bend a big bag Fbf a net bin , a black bend a big bag That boat had been in a babbling brookThat boat had been in a babbling brook Jjj juj juj uju juj jjj juj juj uju juj Juj jug jug juj urn urn juj flu flu juj Juj jug jug juj urn urn juj flu flu juj Juj jungle bugs , just a job , jumbo jets Students show unusual business success . Aaa kaa kaa aaa kaa kaa aa kaa kaa aaa Aaa kim kim aaa lee lee aaa joe joe aaa Aaa jan left ; nora ran ; uncle lee fell ; Mari and ula went to Kansas in October Lesson 10 Aaa aqa aqa qaq aqa aaa aqa aqa qaq aqa Aaa aqa aqa qaq aqa aaa aqa aqa qaq aqa Aqa quo quo aqa aqa qui qui aqa que aqa Aqa quo quo aqa aqa qui qui aqa que aqa Aqa quail , quit quid , half quest , Aqa quail , quit quid , half quest ,The quints sqauabbled on a square quilt. The quints sqauabbled on a square quilt. Aaa aqa aqa aqa qaq aqa aaa aqa aqa qaq aqa ;;; ;/; ;/; /;/ ;/; /// /;/ /;/ ;/; /;/ ;;; ;/; ;/; /;/ ;/; /// /;/ /;/ ;/; /;/ The quick squash squad requested quiet The quick squash squad requested quiet He/she said that we could do either/or. He/she said that we could do either/or. Louise will lead if she makes the team Their bands will march at the quadrant Brad just had time to finish his goals I was quiet as he glided over the wave Find/seek boat fate jail cube brad swat Walk shit mile vane aqua slot quit Find/lose cats/dogs hike/bike walk/rideSeek/hide soft/hard mice/rats shut/ajar Boat goat moat mode rode rude euin quid Fate face race rice nice nile vile mile Jail fail fall gal l mall male vale vane Cube cuba tuba tube lube luau quad qua Brat brat brag quag flag flat flat slat slot Swat swam swim slim slid slid slit suit quit Lesson 11 Quil wagon cabin valued helms , and/or; Quil wagon cabin valued helms , and/or; Jake is quite good in math but not Val Jake is quite good in math but not Val . ;;; ;’; ;’; ‘;’ ;’; ;;; ;’; ;’; ‘;’ ;’; ;;; ;’; ;’; ‘;’ ;’; ;;; ;’; ;’; ‘;’ ;’; ;’; he’s he’s ;’; where’s ;’; it’s it’s ’; he’s he’s ;’; where’s ;’; it’s it’s ’; ‘;’ kit’s barn ;’; where’s ‘;’ its’s it’s ;’; ‘;’ kit’s barn ;’; where’s ‘;’ its’s it’s ;’; ‘;’ kit’s b arn ;’; ed’s car ;’; ‘;’ ;’; ‘;’ kit’s barn ;’; ed’s car ;’; ‘;’ Bill’s car isn’t running ; it’s at Li’s. Bill’s car isn’t running ; it’s at Li’s ;;; ;’; ;’; ;’; ‘;’ ;;; ;’; ;’; ‘;’;’ ;’; â€Å"win† â€Å"win† ;†; ;†; ;;; ;†; ;†; â€Å";† ;†Ã¢â‚¬â„¢ He said â€Å"no thanks , â€Å" but it was â€Å"lame. â€Å" Rita â€Å"forgot , â€Å" but Tim added â€Å"flavors. â€Å" Robbs’s clothes and image don’t â€Å"match. † Mr. Quill said , â€Å"Wait . â€Å" ; she ran back. I haven’t enough time to â€Å"quibble† now. Go to the cabin and get us the dog now. Now is the time to call all men for me.Shee made a face when she lost the race. Ask them if the vase is safe with them. We can’t â€Å"remember† how Bo got bruised. Burt’s dad â€Å"asked† Kurt to assist Ross. Made fade face race lace lice nice mice Made fade face race lace lice nice mice Burt Nora Will Mame Ross Kurt Olaf Elle Burt Nora Will Mame Ross Kurt Olaf Elle He’s I’ve don’t can’t won’t we’ve she’s He’s I’ve don’t can’t won’t we’ve she’s Bo’s dogs Lu’s cows Mo’s cats Di’s rats Bo’s dogs Lu’s cows Mo’s cats Di’s rats â€Å"mat† â€Å"bat† â€Å"west† â€Å"east† â€Å"gone† â€Å"tone† â€Å"mat† â€Å"bat† â€Å"west† â€Å"east† â€Å"gone† â€Å"tone† He â€Å"quit† ; she â€Å"tried. † I hot a â€Å"wall. â€Å" He â€Å"quit† ; she â€Å"tried. I hot a â€Å"wall. â€Å" Sand/land vane/cane robe /love quit/suit Sand/land vane/cane robe /love quit/suit Asks bask base vase case cast mast last Asks bask base vase case cast mast last Lesson 12 Seth Kebo Otis Fran Iris Edie Jose Dave Hans Cara Nita Rene Uris Vera Mark Adam Theo Jean Saul Hugh Eric Noel Vida Ivan Gino Leah Burt Olla Anna Kris Wade Mike Seth Kebo Otis Fran Iris Edie Jose Dave Hans Cara Nita Rene Uris Vera Mark Adam Theo Jean Saul Hugh Eric Noel Vida Ivan Gino Leah Burt Olla Anna Kris Wade Mike Ou- -ivers and oceans a-e being –uined. W- must w-rk t- mak- -ur w-rld cl-an-r -armful c-emicals fill muc- of t-e air.W- hav- lo-t u-ag- of –om- of our -oil Ou- -ivers and oceans a-e being –uined. W- must w-rk t- mak- -ur w-rld cl-an-r -armful c-emicals fill muc- of t-e air. W- hav- lo-t u-ag- of –om- of our -oil The cook went to work with cork boards. Four foul jugs were left at the stream. Toil in the weeds to get the seeds now. Tell a joke , then gather other jesters. Ulan told Brian she would be glad to go . In boston one can see vast fish markets. Burce had this I/0 switch changed again. Treena saw quite a flock of â€Å"odd† birds. Walter took a ride to the quiet street. Quakes threw her around the trick door. Rook took cook cork work word ford foldFull fill file fire fore four foul fowl Jolt joke jets jerk jest just jugs jute Wire were went west jest quit quid quad Weed reed seed seat seal soil toil foil Dour sour sort tort tore wore sore lore Told hold sold sole hole role real teal tire fire sire site suit quit whit with Pg. 32 G. Practice Bran brad bred brew brow crow crew craw Gist list mist must gust dust rust just Vast vest jest lest best west nest rest Blot blob blow blew bled bred brad bran Sun , nun , run , bun , gun , gum , hum , sum , Bout boat boot blot bold doll dole Just dust dusk dunk bunk bulk hulk hunk Beef been bean bead beak beam beat bearLesson 13 Fade cave what swim quad blot king jars Fade cave what swim quad blot king jars Black liquids v anish from the jug I saw. Black liquids vanish from the jug I saw. ;;; ;p; ;p; p;p ;p; ;;; ;p; ;p; p;p ;p; ;;; ;p; ;p; p;p ;p; ;;; ;p; ;p; p;p ;p; ;p; nap nap ;p; pen pen ;p; ape ape ;p; ;p; nap nap ;p; pen pen ;p; ape ape ;p; ;p; perfect plot , a pale page , pen pal , ;p; perfect plot , a pale page , pen pal Pam pulled a pouting pup past a puddle. Pam pulled a pouting pup past a puddle. Sss sxs sxs xsx sxs sss sxs sxs xsx sxs Sxs tax tax sxs mix mix sxs axe axe sxs Sxs lax takes , vexed vixen , six Texans ,Fix the next six boxes on the next weekend ;;; ;p; ;p; p;p ;p; ;;; ;p; ;p; p;p ;p; Sss sxs sxs xxsx sxs sss sxs sxs xsx sxs Phil will fix ripped carpets alone now. Go see that duplex before next weekend. Pull on the tabs. The box will open. Speed is good. Errors are not good. Glue the picture. The book is done. Get the clothes. Bring me their caps. Slag chop gate plop tops bows veal dart Apex slab gave quit fix , hoax text jell Slag flag flap flax flux flew Alex apex Chop clop cl ap clan claw slaw slap slab Gate gale pale page pave have cave gave Plop flop flip slip ship ship whip quip quit Tops tipssips sits sit , six , mix , fix ,Blow bows bowl jowl howl cowl coal coax hoax Veal rel seal meal meat neat next text Dart part park bark balk bal bell jell Lesson 14 Jjj jyj jyj yjy jyj jjj jyj jyj yjy jyj Jyj yes yes jyj joy joy jyj aye aye jyj Jyj yard of yarn of yarn , July joy , yellow yam , Shelley yearns to yodel but only yells If you are happy , will be able To set goals. You will also smile more. The jury was back and no one could Leave the room. We all had to stay put. Jjj jyj jyj yjy jyj jjj jyj jyj yjy jyj I saw yards of yellow fabric every day They happily played in the lonely yard. Yes , the daily reports are ready today.Push your fingers to find the keys now. Keyboarding speed will rapidly improve Your goal is to key faster than before. Try every day to achieve that new goal/ A jury will meet next January to get a verdict. People stole costly fuel F rom the boys. We found bags of cards next to the mops int the broom closet. Fuel duel duet suet suit quit quip quid Gape nape cape cave wave wage wags bags Mops pops maps hops tops toys joys boys . We found Bags of cards next to the mops in the broom closet. Fuel duel diet suet suit quit quip quid Gape nape cape cave wave wage wags bags Mops pops maps hops yops toys toys joys boysRope lope lops laps lips lids kids kiss Card cart curt hurt hurl furl fury jury Cost most lost lest best test text next Slab flab flap flaw flay slay clay play Pan , fan , tan , man , can , ran , Dan , Jan . Lesson 15 Bakechin jogs wave quip dome onyx left His soft big lynx quickly jumped waves. Aaa aza aza zaz aza aaa aza aza zaz aza Aza zip zip aza zoo zoo aza zap zap aza Aza dozing zebu , he zags , dazed zebras , Zachary ate frozen pizza in the gazebo. ;;; ;:; :;: ;:; ;:: ;;; ;:; ;:; ;:; ;:; Dr. Webb : Mr. Que : Mrs. Downs : Ms. La : Mr. Dode : Mrs. Chin : Ms. Finn : Dr. Mai : To: From : Subjext : Attent ion: To:To: From : Subject : Attention : To: Aaa aza aza zaz aza aaa aza aza zaz aza ;;; ;:; ;:; :;: ;;; ;:; ;:; :;: ;:; Zach and zany Hzel visited local zoos. They saw : lazy zebras , apes , and lions. Key fast to reach the end of that line. Keep your eyes on your copy as you key . Tests are easy if you know the answers. If they go to the zoo , invite them too. As Inez roamed the ship , she told Fond tales. Sje slipped on that waxy rung and fell to the deck. S She hurt her face and was dazed , but felt no pain Lesson 16 Nest vote farm hail quid gaze coal waxy bake jeep Nest vote farm hail quid gaze coal waxy bake jeepGail must hold two jobs ; she has had a hard life . Gail must hold two jobs ; she has had a hard life . Kim , Ted has kept liquid oxygen frozen with care. Kim , Ted has kept liquid oxygen frozen with care. Pest west test rest quest roast yeast toast totes Pest west test rest quest roast yeast toast totes Yarn yard ward word worry hurry query quirt quilt Yarn yard ward word worry hurry query quirt quilt Try to get an aqua shirt to wear for the picture. Try to get an aqua shirt to wear for the picture. We took your tire to the shop , but it was ruined We took your tire to the shop , but it was ruinedRobb passed the test ; he studied about two hours. These courses are open : marketing , band , and art . Rachel wishes to key. Her cat is on the computer. Dr. E. O. Anton was given the award in the U. S. A. Gretchen received he B. S and M. B. A. in the a. m. Ask Brenda about the summer sale. It’s in Tucson. Will could buy socks there. The price in minimal. Today , stationery is half off. Help me buy paper. Even the books are reduced. We want to read more. My cousin , Vera , has been exercising for at Least seven weeks. I did my best to keep up with’ Her for at least one hour today , but it was much too difficult.She is ery strong and very quick. As base vases lasts haste taste fasts waste paste Po pole polar poems point poker polka spore s pots Tr trade trips trace strut treat trend stray tray Re read real ream reel reeds breeds freed decreed Br bran brush brute broth bring break bread brain Mu must munch murky mushy musty music mumps mulch Ze amaze gauze dozen prize blaze craze glaze size Cr crate crater create crack crab crib crow croak It is good that you have learned all of the alphabet keys. With just some extra practice , you will zip through work quickly. Lesson 17 Herbs jinx gawk miff vest zinc ploy quad best zooHerbs jinx gawk miff vest zinc ploy quad best zoo Dozy oryx have quit jumping over the huge flocks. Dozy oryx have quit jumping over the huge flocks. Lax folks quickly judged the lazy dogs unfit now. Lax folks quickly judged the lazy dogs unfit now ;;; ;/; ;/? ;? ; ;? ; ;;; ;/; ;/? ;? ; ;? ; ;;; ;/ ;? ;;; ;/; ;/? ;? ; ;? ; ;;; ;/; ;/? ;? ; ;? ; ;;; ;/ ;? ;/; ;? ; now? ;? ; hwo? How? ;? ; who? Who? ;? ; ;/; ;? ; now? ;? ; hwo? How? ;? ; who? Who? ;? ; Who? What? Why? Where? When? When? Next? How many? N ow? Who? What? Why? Where? When? When? Next? How many? Now? How can Joe get there? Which way are the outlets?How can Joe get there? Which way are the outlets? A COMPUTER rapidly scanned most AIRMAIL packages. Another START/STOP safety lever was stuck lately. Was JOSE elected CLASS PRESIDENT today or sooner? You should not answer my door WHEN YOU ARE ALONE. ;;; ;/; ;/? ;? ; ;? ; ;;; ;/; ;/? ;? ; ;? ; ;;; ;/ ;? ;;; ;/; ;/? ;? ; ;? ; ;;; ;/; ;/? ;? ; ;? ; ;;; ;/ ;? Did you see HELEN? Did you learn about her crash? Did you see HELEN? Did you learn about her crash? Her car was hit from hit from BEHIND. She broke BOTH arms. Her car was hit from hit from BEHIND. She broke BOTH arms. HOW will she manage while both arms are in casts?HOW will she manage while both arms are in casts? Tony was a better friend than Hope was to Salena. Lu and I were at Camp Piney Forest in early fall. I rode the Rocky Ford train to San Juan in March. Maya , Sue , and Grace were the. It was exciting. The blind sla ts are broken. Can you fix the broken ones? My WILY dog jumped out of the window Which is how this happened. There should be some way to stop him. For a young dog , he is AMAZING Slat slit skit suit quit quip qiz whiz fizz Slat slit skit suit quit quip qiz whiz fizz LASS bass base bake CAKE cage PAGE sage SAGA sags LASS bass base bake CAKE cage PAGE sage SAGA sagsMaze mare more mover wove cove core cure pure pore Maze mare more mover wove cove core cure pure pore Mix; fix; fin; kin; kind wind wild wily will well Mix; fix; fin; kin; kind wind wild wily will well Cape cane vane sane same sale pale pals pats bats Cape cane vane sane same sale pale pals pats bats Jump pump bump lump limp limb lamb jamb jams hams Jump pump bump lump limp limb lamb jamb jams hams Slow BLOW blot SLOT plot PLOP flop FLIP blip BLOB Slow BLOW blot SLOT plot PLOP flop FLIP blip BLOB Mite more wire tire hire hide hive jove give five . Mite more wire tire hire hide hive jove give five . Lesson 18Rave jinx tact safe mind glib quit yelp hawk doze Rave jinx tact safe mind glib quit yelp hawk doze We all must be good friends to have good friends. We all must be good friends to have good friends. We have quickly gained sixty prizes for best jam. We have quickly gained sixty prizes for best jam ;;; ;p; ;p-; ;-; -;- ;;; ;p; ;p-; ;-; -;- ;;; ;-; ;;; ;p; ;p-; ;-; -;- ;;; ;p; ;p-; ;-; -;- ;;; ;-; ;p- ;-; self-made ;-; one-third ;p one-sixth ;-; ;p- ;-; self-made ;-; one-third ;p one-sixth ;-; ;p- ;-; part-time ;-; one-tenth ;p- two-party ;-; ;p- ;-; part-time ;-; one-tenth ;p- two-party ;-; Self-made Jim stopped at an out-of-the-way placeSelf-made Jim stopped at an out-of-the-way place ;p; ;p- ;-; ;-_; ;p-_ _;_ ;p-_ ;-:; ;_; ;p- ;;; ;p; ;p_; ;_; _;_ ;;; ;p; ;p_; ;p_; ;_; _;_ ;;; ;_; Are you an easy-going person who gets along well? The new name he now uses for e-mail is jute_rope. Steward and Phon drove a car down to the shelter. Ten people helped serve meals to thirty children. They said it was ha rd work. Jung felt happy then. This might help solve these problems in our city. Look up in the western sky and see how it is Filled with magnificent pinks and reds as the sun Begins to set. As the sun sinks below the clouds , You will see an amazing display of great colors.Was raged wheat serve force carts bears cages age Tag exact vases rests crank enter greet moves ear Was raged wheat serve force carts bears cages age Tag exact vases rests crank enter greet moves ear Get table stage hired diets gears wages warts rat Hop mouth union input polka alone moors tunic joy Him looms pumps nouns joked pound allow pours hip Lip mopes loose equip moods unite fills alike mop We saw where gray lava flowed down a path. At the exit , Justin saw trees with no bark and a Quiet , fuzzy duck looking at me Lesson 19 Fuzz busy flat apex gash avow junk quad czar mind Fuzz busy flat apex gash avow junk quad czar mindWe should try to make a call before the day ends. We should try to make a call before t he day ends Rob moved a psychology quiz to next week for Jay Rob moved a psychology quiz to next week for Jay Up by rod hun cue dry mow zip elk jaw van era ark Do we fad wet tab boy hid lug mug zap box kid fog in my car zoo tag pop vat jar lid yam fi war qua So to add fun joy fun sew lad man did nip was hop Quinton Robert Farris Cheryl Eunice Xavier George Juliet Noelle Ulysses Ingmar Hunter Yasmin Melvin Quinon Robert Farris Cheryl Eunice Xavier George Jukiet Noelle Ulysses Ingmar Hunter Tamara Zachary Quenna Aurora Bryant Dawson SalomeTamara Zachary Quenna Aurora Bryant Dawson Salome Mignon Jefferey Yvette Olinda Harold Joanna Lionel Mignon Jeffrey Yvette Olinda Harold Joanna Lionel We read the daily newspaper to learn what is going on in other countries. Do yo also read it? Do you read or watch the newa? If you don’t , you should. How will you learn what is happening? E-ch d-y thos- fing-rs w-ll m-ove a l-ttl- f-st-r. Y-u m-st le-rn to th-nk wh-re all thos- k-ys ar-. D- y- u ke-p yp-r ey-s on th- c-py y-u ar- key-ng? On- d-y so-n yo-r f-ng-rs w-ll fly ov-r th- k-ys Accounting is a good course. I am taking it soon. Dr. Tim Bellio , Ph. D , is in the U. S. or the U.K. Please turn on the TV; my favorite program is on. Mr. C L. Brickman and his son , T. J , are home. We must talk to two people: Anthony and Consuela Jay and Ed were on time. Iva liked doing ai Chi. Both Y. O. Fox and T. C Ole had a Ph. D in math. Alberto , set the clock. It is good to be on time. Mr. Vasquez and Mr. Mayer were not in the office. Have you tried to get a project completed by A deadline only to realize that you simply will Not be able to finish it? What you do next will Depend on the prokect and how soon you need it. Se seats seal pulse lease seams eases sedan mouse Gr great gray grows grain grade grass groan graveLo love glove ploys clock locks flock block lobes Dr draft drift drive dress drama drums drab drape Av lava paved abert favor shave avoid brave raven Nk drink pink l inks crank plank sinks honks blank Sc scar scare scant scrap scent scoot scold scone Ba barks bare barns barb baby back bang bald bath Lesson 20 Itch plum jilt waxy fi next clod quad brag skit It is good to meet new people as soon as you can. Cover the cozy liquid wax before Jack mops again. Baffle quartz toxic veins major whack gaudy equip Banjo wizard rhyme heaven steep affix laugh quack Matrix shady squat venom jacket spill zebra fudgeBe quick to move them/down; jinx lazy fingers. Querida Arthur Donata Regina Gwynne Warden Samuel Leilani Ursula Javier Margot Phoebe Irving Oliver Timothy Carlos Elliot Felice Zenina Vernon Winona Nokomis Isabel Hayley Pascal Justin Latham Kemeko Di you meet your goals? I did not. They all did. My car is stuck. I need it towed . Will you do it ? Let’s see a movie. What’s playing? I do not know. Look at that. It is quite amazing. I am thrilled. K—p a;; f-ngers curv-d –nd y—r we-sts a b-t. Ke-p y-ur elb-ws r-lax-d a nd cl-se to y-ur s-des. K-ep y-ur h-ad up –nd t-rned tow-rd th- textb—k K-ep b-th fe-t on th- flo-r , on- aft-r th- oth-r.Toms’s flowers – especially the tilips—are lovely. Have you seen her gloves? Are they in the drawer? If Leilani can go tomorrow , we will go then also. Estes Park has roads as well as hike/bike trails/ That fly-by-night business was selling old disks. Oliver let Margo answer the TCP/IP Internet quiz. Connecting with the World Wide Web was Difficult. Janice Learned about URL’s , FTP , and TCP/IP sites. Sam , Jo , and Di were fluent in German and French . There are fewer gold cources in Clark County THANK Milton County. One reason is the need for rich soil to grow grass. Clark County has mostly clay soil , which does not absorb water well.Asa adie sadly flask sqaild saved trash masks sas Fgf fight goofs golfs fugue gaffe foggy frogs gfg Wew weans sweet swell sweat sweat fewer weeks ewe Rtr art part port sort sort fort worth trade title rtr Klk kilns kilts kelts kelts keels fock block locks lkl Nmn means lemon minor numbs names money hyms mnm Oio boils soils joins coins lions tolis 1. Wafting zephyrs quickly vexed jumbo 2. Wafting zephyrs quickly vexed jumbo 3. Wafting zephyrs quickly vexed jumbo 4. Wafting zephyrs quickly vexed jumbo 5. Wafting zephyrs quickly vexed jumbo 6. Wafting zephyrs quickly vexed jumbo 7. Wafting zephyrs quickly vexed jumbo 8.Wafting zephyrs quickly vexed jumbo 9. Wafting zephyrs quickly vexed jumbo 10. Wafting zephyrs quickly vexed jumbo 11. Wafting zephyrs quickly vexed jumbo 12. Wafting zephyrs quickly vexed jumbo 13. Wafting zephyrs quickly vexed jumbo 14. Wafting zephyrs quickly vexed jumbo 15. Wafting zephyrs quickly vexed jumbo 16. Wafting zephyrs quickly vexed jumbo 17. Wafting zephyrs quickly vexed jumbo 18. Wafting zephyrs quickly vexed jumbo 19. Wafting zephyrs quickly vexed jumbo 20. Wafting zephyrs quickly vexed jumbo 21. Wafting zephyrs quickly vexed jumbo 22. Wa fting zephyrs quickly vexed jumbo 23. Wafting zephyrs quickly vexed jumbo 4. Wafting zephyrs quickly vexed jumbo 25. Wafting zephyrs quickly vexed jumbo 1. The quick brown fox jumps over the lazy dog 2. The quick brown fox jumps over the lazy dog 3. The quick brown fox jumps over the lazy dog 4. The quick brown fox jumps over the lazy dog 5. The quick brown fox jumps over the lazy dog 6. The quick brown fox jumps over the lazy dog 7. The quick brown fox jumps over the lazy dog 8. The quick brown fox jumps over the lazy dog 9. The quick brown fox jumps over the lazy dog 10. The quick brown fox jumps over the lazy dog 11. The quick brown fox jumps over the lazy dog 12.The quick brown fox jumps over the lazy dog 13. The quick brown fox jumps over the lazy dog 14. The quick brown fox jumps over the lazy dog 15. The quick brown fox jumps over the lazy dog 16. The quick brown fox jumps over the lazy dog 17. The quick brown fox jumps over the lazy dog 18. The quick brown fox jumps over the lazy dog 19. The quick brown fox jumps over the lazy dog 20. The quick brown fox jumps over the lazy dog 21. The quick brown fox jumps over the lazy dog 22. The quick brown fox jumps over the lazy dog 23. The quick brown fox jumps over the lazy dog 24. The quick brown fox jumps over the lazy dog Homework Assigment 1: Foundations: Atoms, Molecules, and Ions 1. 1 A 47. 3-mL sample of ethyl alcohol (ethanol) has a mass of 37. 32 g. What is its density? 1. 2 If 116 g of ethanol is needed for a chemical reaction, what volume of liquid would you use? The density of ethanol is 0. 789 g/mL 1. 3 Battery acid is 40. 0% sulfuric acid, H2SO4, and 60. 0% water by mass. Its density is 1. 31. Calculate the mass of pure H2SO4 in 100. 0 mL of battery acid. 1. 4 How many moles of atoms does 136. 9 g of iron metal contain? 1. 5 A stack of 500 sheets of typing paper is 1. inches thick. Calculate the thickness, in inches and in miles, of a stack of typing paper that contains one mole (Avogadro’s number) of sheets (1 inch = 2. 54 cm) 1. 6 Compounds containing sulfur and oxygen are serious air pollutants; they represent the major cause of acid rain. Analysis of a sample of a pure compound reveals that it contains 50. 1% sul- fur and 49. 9% oxygen by mass. What is the simplest formula of the compound ? 1. 7 A 20. 882-gram sample of an ionic compound is found to contain 6. 072 grams of Na, 8. 474 grams of S, and 6. 336 grams of O. What is its simplest formula? 1. 8 Hydrocarbons are organic compounds composed entirely of hydrogen and carbon. A 0. 1647-gram sample of a pure hydrocarbon was burned in a C-H combustion train to produce 0. 4931 gram of CO2 and 0. 2691 gram of H2O. Determine the masses of C and H in the sample and the percentages of these elements in this hydrocarbon. 1. 9 A 0. 1014-g sample of purified glucose was burned in a C-H combustion train to produce 0. 1486 g of CO and 0. 0609 g of H2O. An elemental analysis showed that glucose contains only carbon, hydrogen, and oxygen. Determine the masses of C, H, and O in the sample and the percentages of these elements in glucose. 1. 10 Phosphorus, P4, burns with excess oxygen to form tetraphosphorus decoxide, P4O10. In this reaction, what mass of P4 reacts with 1. 50 moles of O2? 1. 11 What mass of CO2 could be formed by the reaction of 16. 0 g of CH4 with 48. 0 g of O2? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com 1. 12 What is the maximum mass of Ni(OH)2 that could be prepared by mixing two solutions that contain 25. g of NiCl2 and 10. 0 g of NaOH, respectively? NiCl2 + NaOH — > Ni(OH)2 + NaCl 1. 13 A 15. 6-gram sample of C6H6 is mixed with excess HNO3. We isolate 18. 0 grams of C6H5NO2. What is the percent yield of C6H5NO2 in this reaction? 1. 14 Phosphoric acid, H3PO4, is a very important compound used to make fertilizers. It is also pres- ent in cola drinks. H3PO4 can be prepared in a two-step process. Rxn 1: P4 +O2 — > P4O10 Rxn 2: P4 O10 +H2O — > H3PO4 We allow 272 grams of phosphorus to react with excess oxygen, which forms tetraphosphorus decoxide, P4O10, in 89. % yield. In the second step reaction, a 96. 8% yield of H3PO4 is obtained. What mass of H3PO4 is obtained? 1. 15 2. 00 grams of ammonium sulfate was dissolved in distilled water and made up to 250 mL in a volumetric flask. A 25. 0 mL portion of this solution was boiled with 50. 0 mL of 0. 100 M sodium hydroxide solution until no more ammonia gas was evolved. Then excess sodium hydroxide in the resulting solution required for neutralization, 24. 30 mL of HCl 0. 100M. Calculate the percentage purity of the sample. 1. 16 Write the correct formulae/ions for: Potassium sulfite:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Dinitrogen pentoxide:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Nitrorous acid: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Sodium hyperchlorite†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Chloric acid†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Hydride ion:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Coprous ions: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Mercuric ion†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1. 17 In acidic solution, dichromate ion will oxidize ferrous ion to ferric ion and form chromate (III) ion. What volume of 0. 100 M dichromate ion is required to oxidize 60. 0 mL of 0. 250 M of ferrous ion? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com Homework Assigment 1: Foundations: Atoms, Molecules, and Ions 1. 1 A 47. 3-mL sample of ethyl alcohol (ethanol) has a mass of 37. 32 g. What is its density? 1. 2 If 116 g of ethanol is needed for a chemical reaction, what volume of liquid would you use? The density of ethanol is 0. 789 g/mL 1. 3 Battery acid is 40. 0% sulfuric acid, H2SO4, and 60. 0% water by mass. Its density is 1. 31. Calculate the mass of pure H2SO4 in 100. 0 mL of battery acid. 1. 4 How many moles of atoms does 136. 9 g of iron metal contain? 1. 5 A stack of 500 sheets of typing paper is 1. inches thick. Calculate the thickness, in inches and in miles, of a stack of typing paper that contains one mole (Avogadro’s number) of sheets (1 inch = 2. 54 cm) 1. 6 Compounds containing sulfur and oxygen are serious air pollutants; they represent the major cause of acid rain. Analysis of a sample of a pure compound reveals that it contains 50. 1% sul- fur and 49. 9% oxygen by mass. What is the simplest formula of the compound ? 1. 7 A 20. 882-gram sample of an ionic compound is found to contain 6. 072 grams of Na, 8. 474 grams of S, and 6. 336 grams of O. What is its simplest formula? 1. 8 Hydrocarbons are organic compounds composed entirely of hydrogen and carbon. A 0. 1647-gram sample of a pure hydrocarbon was burned in a C-H combustion train to produce 0. 4931 gram of CO2 and 0. 2691 gram of H2O. Determine the masses of C and H in the sample and the percentages of these elements in this hydrocarbon. 1. 9 A 0. 1014-g sample of purified glucose was burned in a C-H combustion train to produce 0. 1486 g of CO and 0. 0609 g of H2O. An elemental analysis showed that glucose contains only carbon, hydrogen, and oxygen. Determine the masses of C, H, and O in the sample and the percentages of these elements in glucose. 1. 10 Phosphorus, P4, burns with excess oxygen to form tetraphosphorus decoxide, P4O10. In this reaction, what mass of P4 reacts with 1. 50 moles of O2? 1. 11 What mass of CO2 could be formed by the reaction of 16. 0 g of CH4 with 48. 0 g of O2? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com 1. 12 What is the maximum mass of Ni(OH)2 that could be prepared by mixing two solutions that contain 25. g of NiCl2 and 10. 0 g of NaOH, respectively? NiCl2 + NaOH — > Ni(OH)2 + NaCl 1. 13 A 15. 6-gram sample of C6H6 is mixed with excess HNO3. We isolate 18. 0 grams of C6H5NO2. What is the percent yield of C6H5NO2 in this reaction? 1. 14 Phosphoric acid, H3PO4, is a very important compound used to make fertilizers. It is also pres- ent in cola drinks. H3PO4 can be prepared in a two-step process. Rxn 1: P4 +O2 — > P4O10 Rxn 2: P4 O10 +H2O — > H3PO4 We allow 272 grams of phosphorus to react with excess oxygen, which forms tetraphosphorus decoxide, P4O10, in 89. % yield. In the second step reaction, a 96. 8% yield of H3PO4 is obtained. What mass of H3PO4 is obtained? 1. 15 2. 00 grams of ammonium sulfate was dissolved in distilled water and made up to 250 mL in a volumetric flask. A 25. 0 mL portion of this solution was boiled with 50. 0 mL of 0. 100 M sodium hydroxide solution until no more ammonia gas was evolved. Then excess sodium hydroxide in the resulting solution required for neutralization, 24. 30 mL of HCl 0. 100M. Calculate the percentage purity of the sample. 1. 16 Write the correct formulae/ions for: Potassium sulfite:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Dinitrogen pentoxide:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. Nitrorous acid: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Sodium hyperchlorite†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Chloric acid†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Hydride ion:†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Coprous ions: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Mercuric ion†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1. 17 In acidic solution, dichromate ion will oxidize ferrous ion to ferric ion and form chromate (III) ion. What volume of 0. 100 M dichromate ion is required to oxidize 60. 0 mL of 0. 250 M of ferrous ion? Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 -Le Thanh Tong, Hanoi, Vietnam. Email: [email  protected] com