CHEM115 EXAM 2

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Rivier University *

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101

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Chemistry

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Dec 6, 2023

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CHEM-115 Test 2 -Chapters: 3.7-4 Multiple Choice: (1 point each) 1.) What are the numbers called that are written in front of compounds in chemical equations? a. prescripts b. subscripts c. postscripts 2.) What chemical equation has the following basic formula: C+C à C+C a. single disp. b. double disp. c. decomp. e. combustion 3.) What chemical equation has the following basic formula: E+C à E+C b. double disp. c. decomp. d. synth. e. combustion 4.) What chemical equation has the following basic formula: AB à A+B a. single disp. b. double disp. d. synth. e. combustion 5.) What chemical equation has the following basic formula: AB+CD à CB+AD a. single disp. c. decomp. d. synth. e. combustion 6.) What type of reaction uses O 2 to produce CO 2 and H 2 O? a. single disp. b. double disp. c. decomp. d. synth. Use the following equation to answer questions 7&8: H 2 SO 3(aq) à H 2 O (l) + SO 2(g) 7.) On the reactant side of the equation, how many oxygen are there? a. one b. two d. four e. five 8.) What do the letters “aq” mean after the H 2 SO 3 ? a. liquid c. solid d. gas Use the following activity series to answer questions 9&10 Most active à Li, K, Ca, Na, Mg, Al, Zn, Fe, Ni, Pb, Cu, Ag ß Least Active 9.) Which of the following elements would NOT replace Fe in a chemical reaction? a. K b. Ni c. Ag d. Li e. both a+b f. both c+d 10.) Which of the above elements would allow the following reaction to take place? ____ + CaO à ____O + Ca b. Na c. Zn d. Cu

11.) What is defined as the substance that is dissolved, and present in the smaller amount? b. the solution c. the solvent d. the electrolyte 12.) Saltwater conducts electricity, this conduction is known as what kind of solution? a. nonelectrolytic c. aqueous d. nonaqueous 13.) Which of the following is a weak acid? a. HNO 3 b. HCl d. H 2 SO 4 14.) Which of the following is a weak base? a. KOH c. NaOH d. CH 3 COOH 15.) Which of the following is a triprotic acid? b. H 2 SO 4 c. HCl d. CH 3 COOH Balance the following equations: Put all final answers on your answer sheet. (2 points each) Example à H 2 + O 2 --> H 2 O ___ + ___--> ___ 2 + 1 --> 2 1.) PaI 5 à Pa + I 2 2.) Al + H 2 SO 4 à Al 2 (SO 4 ) 3 + H 2 3.) ZnO + HCl à ZnCl 2 + H 2 O 4.) Cr + SnCl 4 à CrCl 3 + Sn 5.) Al + Pb(NO 3 ) 2 à Al(NO 3 ) 3 + Pb Write and balance the following equations: Put all final answers on your answer sheet. (3 points each) 1.) Hydrogen and bromine make hydrogen bromide 2.) Sodium and copper (I) chloride make sodium chloride and copper 3.) Lithium and water make lithium hydroxide and hydrogen 4.) sodium nitrate and lithium chloride makes lithium nitrate and sodium chloride 2PaIs 22Pa 512 2A 342504 2A 2150473 342 ZnO 2 HCl 22h02 H2O Hcr 35h04 24043 35h 2AIT3Pb N3 2 02A Nz 3Pb Synthesis Hat Bra o2HBr single Displacement Nat Cult Nacl u single Displacement 24 211 20 024 OH H2 Double Displacement NANOSTLICI Lino Nacl

STOICHIOMETRY: Show all final work, including your factor-label set up, on the answer sheet. Use the following balanced equation for questions 1-3: (5 points each) 3Ca(OH) 2 + 2H 3 PO 4 à Ca 3 (PO 4 ) 2 + 6H 2 O 1.) If 7.0 moles of H 3 PO 4 react with calcium hydroxide, how many moles of Ca 3 (PO 4 ) 2 will be produced? 2.) If 5 moles of Ca(OH) 2 are present, how many grams of Ca 3 (PO 4 ) 2 will be produced? 3.) If 250 grams of water are produced, how many grams of Ca(OH) 2 must have reacted? Use the following balanced equation for questions 4-7: 2Al + 3S à Al 2 S 3 4.) If there are 50.0 grams of Al and 65 grams of S available, how many grams of Al 2 S 3 could be produced from each reactant? 5.) Which of these two reactants is the limiting reactant? 6.) How much Al 2 S 3 , in grams, could be produced? 7.) Calculate the reaction percent yield of Al 2 S 3 if 72 grams are actually produced. Write and balance the ionic and net ionic equation (if there is one) for each of the following reactions: Put your answers on your answer sheet. (4 points each) 1.) CaCl 2 + NH 4 OH <--> Ca(OH) 2 + NH 4 Cl 2.) Pb(NO 3 ) 2 + Na 2 S --> PbS + 2NaNO 3 3.) CaBr 2 + Li 2 SO 4 --> 2LiBr + CaSO 4 Predict the products of the following reactions and balance. Show the final balanced equations only on your answer sheet. (3 points each) 1.) Na 2 O à 2.) Cu + AgNO 3 à 3.) FeS à 4.) Ca(OH) 2 +Al(NO 3 ) 3 à 5.) Mg + O 2 à 6.) C 6 H 16 + O 2 à 7.) KBr + Ag Cl à 8.) Zn + HNO 3 à 9.) F 2 + NaCl -> 10.) Na + Cl 2 à calcium Hydroxide calcium phosphate phosphoric Acid Aluminum Sulfide Decomposition Single Displacement Decomposition Double Displacement Synthesis Combustion Double Displacement Single Displacement single Displacement synthesis

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Concentration and dilution: Show your set up and calculations for the following problems: (4 points each) 1.) How many grams of KOH are present in 35 mL of a 5.50 M solution. 2.) What is the molarity of a CaCl 2 solution if 10.4 grams are dissolved in 220 mL of water 3.) You have 505 mL of a 0.125 M HCl solution and you want to dilute it to exactly 0.100 M . How much water should you add?

Name:_____________________________________________ Test 2: Chapters 3.7-4 Multiple Choice: (1 point each) 1. a b c d 9. a b c d e f g 2. a b c d e 10. a b c d 3. a b c d e 11. a b c d 4. a b c d e 12. a b c d 5. a b c d e 13. a b c d 6. a b c d e 14. a b c d 7. a b c d e 15. a b c d 8. a b c d Balancing Equations: (2 points each) 1.) _____ à _____ + _____ 2.) _____ + _____ à _____ + _____ 3.) _____ + _____ à _____ + _____ 4.) _____ + _____ à _____ + _____ 5.) _____ + _____ à _____ + _____ Writing and balancing equations: (3 points each) 1.) 2.) 3.) 4.) i i 2 2 5 2 3 1 3 I 2 I I 4 3 4 3 2 3 2 3 Hz Brz 2HBr NatCull Nacht Cu 211 2420 2LLiOHtH2 NANO Lid oLiNOztNacl

STOICHIOMETRY: (5 points each) 3Ca(OH) 2 + 2H 3 PO 4 à Ca 3 (PO 4 ) 2 + 6H 2 O 1.) 2.) 3.) 2Al + 3S à Al 2 S 3 4.) 5.) 6.) 7.)

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Write and balance the ionic and net ionic equation: (4 points each) 1.) Ionic: Net Ionic: 2.) Ionic: Net Ionic: 3.) Ionic: Net Ionic: Predict the products and balance: (3 points each) 1.) 2.) 3.) 4.) 5.) Ca42t2NHyOH C CALONTINHYU Cat LCI 2NHyt LOH o Ca't LOH 2N LET NIA Pb NO ztNazS opbsttLNanoz Pb 2NO5 2Natts I 2Natt2NO5 Pbs is Pb't Stopbsis CaBrtLizS04 22librtCasout CaH 2BFt2Lit 504 021112135 09504 s Catt 504 2950467 2Nd 20 02Nd 2 02 Cut Agno CUNO Ag Fes o Fets 3Ca OH ZAI NO 23cal NO zt2A OH 2mg 02 02m90