!!! Chemistry*11* Name:* Date:*

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1 Chemistry*11* Name:* Date:* Stoichiometry*PRACTICE*Test* Block:* 1.Areactionbetweenphosphorusandchlorinetakesplace.Whichofthe followingisthecorrectunbalancedreaction? A. P+ClPCl 3 B. P 2+Cl 2PCl 3 C. P 4+Cl 2PCl 3 D. P 8+Cl 2PCl 3 2.Completethefollowingreaction: Na+S 8 A. NaS B. Na 2S C. NaS 2 D. NaS 3 3.Whenthefollowingequationisbalanced,whatwillthecoefficientbefor fluorine? AlCl 3+ F 2 AlF 3+ Cl 2 A. 2 B. 3 C. 4 D. 5 4.Whenthefollowingequationisbalanced,whatwillthecoefficientbefor chlorine? CH 4+ Cl 2 CH 3Cl+ H 2 A. 1 B. 2 C. 3 D. 4 5.Thefollowingunbalancedchemicalequationisgiven. 2C 2H 6+ O 24CO 2+6H 2O Howmanymolesofethane,C 2H 6,reactswith14molesofoxygen? A. 1 B. 2 C. 4 D. 8 6.Explainyouranswertothequestionabove: 7.Thefollowingchemicalequationisgiven. 2Ag + +S 2O 8? Ag 2S 2O 8 WhatistheionicchargeontheS 2O 8ion? A. 1+ B. 1U C. 2+ D. 2U 8.AreactionbetweenC 3H 8O 2andoxygenwouldproduce: A. C 3H 6O+H 2O B. CO 2+H 2O C. Asaltandwater D. Impossibletopredict 9.Hydrochloricacidandsodiumhydroxidereacttoproduce A. Anexplosion B. CO 2+H 2O C. Asaltandwater D. Impossibletopredict

2 10.Theequationtocalculatepercentpurityis: A. B. C. D. "#$%&"## "#$"## "#$"## "#$%&"## "#$%%"#$% "#"$"%&"#$% "#"$"%&"#$% "#$%%"#$% 11.Asubstancethatreactswithanothersubstanceandiscompletely reactedandconsumediscalledthe: A. Atheoreticalreactant B. Alimitingreactant C. Anexcessreactant D. Astandardreactant 12.Considerthefollowingreaction: 2H 2+O 22H 2O 2.0molofH 2reactswith2.0molofO 2.Whatisthelimitingreactant? A. H 2 B. O 2 C. H 2O D. Thelimitingreactantdoesnotexist 13.Showyourworkforthequestionabove: 14.Aftercompletingandbalancingthereactionbelow,themoleratioof potassiumtooxygeninthechemicalequationbelowis: K+O 2 A. 4to1 B. 4to2 C. 2to3 D. 1to1 15.Asampleofcobalt(II)chloridehas94.0%purity.Ifthetotalsample weighs15604g,whatisthemassofpurecobalt(ii)chloride? A g B g C g D. 94.0g 16.Asampleofsodiummetalhas0.200%purity.Ifonly13.5gofthe samplereacts,whatisthetotalmassofthesample? A g B g C. 13.5g D. 6750g 17.Areactionisexpectedtoproduce94.0gofaproduct.However,only 17.0gisrecoveredattheendoftheexperiment.Whatwasthepercentyield? A. 5.50% B. 17.0% C. 18.0% D. 94.0% 18.Brieflyexplainyouranswertothequestionabove: 19.Areactionisknowntoonlyproduce90.0%yield.Ifthereactionis predictedtoproduce90.0g,howmuchproductwillyouactuallyproduce? A. 81.0g B. 90.0g C. 99.9g D. 100.g

3 (1)Writeabalancedequationrepresentingthefollowingreactions.Youonlyneedtocompletethreeequations. Indicatewhichequationyouwouldlikemarkedbyacheckmarkintheboxnexttotheequation. Lead(IV)nitridereactswithlithiumsulphide. Synthesisofpotassiumpermanganatefromitselements Sodiumsulphateandcopper(II)phosphatewereproducedinthisreaction. Ammoniumnitrideandlead(III)chloratereacttogether. Iodinetrifluoride,oxygengashydrofluoricacid(HF)reacttogetheratSTPtoformiodinetetrafluorideand water.

4 (2)Theequationforthereactionofaluminummetalwithfluorinegasis: Al+F 2"AlF 3 a. Whatisthebalancedchemicalequation? b. If116.1gofAlisreactedwithexcessfluorinegas,howmuchmassoftheproductismade? (3)6.57goflead(II)acetatearereactedwith24.8mLof1.50Mnitrousacid(HNO 2)accordingtothereaction: Pb(CH 3COO) 2+2HNO 2"Pb(NO 2) 2+2CH 3COOH a) Whatmassoflead(II)nitritewillbeformed? b) Whatmassorvolumeoftheexcessreactantwillbeleftover? + +

5 (4)Considerthebalancedreaction: 4Na+O 2"2Na 2O a) Sodiumhasapurityof78.2%.Howmanygramsoftheproductwillbeformedfrom56.0gofsodium? b) Ifthereactionhasa64.7%yield,whatmassofeachreactantwouldbeneededtoproduce100.0gofthe product? (5)Inanexperiment,3.44gof90.0%pureH 2and6.25gof80.0%pureO 2areplacedinareactionvessel.The introductionofasparkcausesaviolentexplosionthatgenerateswater. a) Whatisthebalancedreaction? b) Whatisthelimitingreactant?

6 (6)Considerthefollowingreaction: 3NO 2(g)+H 2O (l)"2hno 3(aq)+NO (g) Astudentplacedacertainamountofeachchemicalinaclosedsystem(lookattheINITIAL+box).Thereactionis allowedtooccurtocompletion.sketchinthefollowingfinalpictorialusingthesymbolsusedtorepresenteach particlelocatedinthelegend(table'#1). Table+1:+Legend+ + + INITIAL+(beforereaction) FINAL(afterreaction) Particle+ Symbol+ NO 2 H 2O HNO 3 NO