MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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1 Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When the following equation is balanced, the coefficients are. 1) NH3 (g) + O2 (g) NO2 (g) + H2O (g) A) 4, 7, 4, 6 B) 1, 1, 1, 1 C) 2, 3, 2, 3 D) 1, 3, 1, 2 E) 4, 3, 4, 3 2) When the following equation is balanced, the coefficients are. 2) Al(NO3)3 + Na2S Al2S3 + NaNO3 A) 2, 3, 2, 3 B) 2, 1, 3, 2 C) 1, 1, 1, 1 D) 4, 6, 3, 2 E) 2, 3, 1, 6 3) Predict the product in the combination reaction below. 3) Al (s) + O2 (g) A) AlO3 B) AlO C) Al2O3 D) AlO2 E) Al3O 4) There are mol of carbon atoms in 4 mol of dimethylsulfoxide (C2H6SO). 4) A) 4 B) 2 C) 6 D) 8 E) 3 5) There are sulfur atoms in 25 molecules of C4H4S2. 5) A) 50 B) C) D) E) ) How many grams of hydrogen are in 46 g of CH4O? 6) A) 184 B) 5.8 C) 0.36 D) 1.5 E) 2.8 7) There are molecules of methane in mol of methane (CH4). 7) A) B) 5 C) D) E)

2 8) What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass? 8) A) S2OCl B) SOCl C) SO2Cl D) ClSO4 E) SOCl2 9) What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass? 9) A) KSO4 B) K2SO3 C) KSO3 D) K2SO4 E) KSO2 10) A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is amu. The molecular formula of this compound is. 10) A) C2H2O4 B) C2H4O2 C) CH2O D) C2H3O4 E) CHO2 11) A compound is composed of only C, H, and O. The combustion of a g sample of the compound yields 1.24 g of CO2 and g of H2O. What is the empirical formula of the compound? A) C2H6O2 B) C3H3O C) C6H6O D) C2H6O5 E) CH3O 11) 12) Combustion of a g sample of a compound containing only carbon, hydrogen, and oxygen produced g of CO2 and g of H2O. What is the empirical formula of the compound? 12) A) C4H10O2 B) C2H5O2 C) C4H11O2 D) C4H10O E) C2H5O 13) Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2): 13) CaC2 (s) + 2H2O (g) Ca(OH)2 (s) + C2H2 (g) Production of 13g of C2H2 requires consumption of g of H2O. A) 4.5 B) 9.0 C) D) 18 E) ) Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: 14) PbCO3 (s) PbO (s) + CO2 (g) How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate? A) B) 0.41 C) 2.61 D) 2.09 E) ) What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? 15) Mg (s) + 2H2O (l) Mg(OH)2 (s) + H2 (g) A) B) C) D) E)

3 16) What is the maximum amount in grams of SO3 that can be produced by the reaction of 1.0 g of S with 1.0 g of O2 via the equation below? 16) S (s) + O2 (g) SO3 (g) (not balanced) A) 0.27 B) 2.0 C) 1.7 D) 2.5 E) ) Sulfur and oxygen react in a combination reaction to produce sulfur trioxide, an environmental pollutant: 17) 2S (s) + 3O2 (g) 2SO3 (g) In a particular experiment, the reaction of 1.0 g S with 1.0 g O2 produced 0.80 g of SO3. The % yield in this experiment is. A) 21 B) 48 C) 88 D) 29 E) 30 18) Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 18) 4Al (s) + 3O2 (g) 2Al2O3 (s) In a particular experiment, the reaction of 2.5 g of Al with 2.5 g of O2 produced 3.5 g of Al2O3. The % yield of the reaction is. A) 66 B) 37 C) 74 D) 26 E) 47 19) Of the reactions below, which one is not a combination reaction? 19) A) 2Mg + O2 2MgO B) CaO + H2O Ca(OH)2 C) 2N2 + 3H2 2NH3 D) C + O2 CO2 E) 2CH4 + 4O2 2CO2 + 4H2O 20) Which one of the following substances is the product of this combination reaction? 20) Al (s) + I2 (s) A) AlI3 B) Al2I3 C) AlI D) Al3I2 E) AlI2 3

4 21) Which of the following are combustion reactions? 1) CH4 (g) + O2 (g) CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) CaCO3 (s) 3) PbCO3 (s) PbO (s) + CO2 (g) 4) CH3OH (l) + O2 (g) CO2 (g) + H2O (l) 21) A) 2, 3, and 4 B) 1 and 4 C) 1, 3, and 4 D) 3 and 4 E) 1, 2, 3, and 4 22) The formula weight of potassium dichromate (K2Cr2O7) is amu. 22) A) B) C) D) E) ) The formula weight of aluminum sulfate (Al2(SO4)3) is amu. 23) A) B) C) D) E) ) The mass % of Al in aluminum sulfate (Al2(SO4)3) is. 24) A) B) C) D) E) ) There are atoms of oxygen are in 300 molecules of CH3CO2H. 25) A) 600 B) C) D) E) ) How many moles of sodium carbonate contain carbon atoms? A) B) C) D) E) ) 4

5 27) Lithium and nitrogen react in a combination reaction to produce lithium nitride: 27) 6Li (s) + N2 (g) 2Li3N (s) How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen? A) 1.8 B) 3.6 C) 0.40 D) 0.30 E) ) The total concentration of ions in a M solution of HCl is. A) M B) M C) M D) M E) essentially zero. 28) 29) A strong electrolyte is one that completely in solution. A) ionizes B) decomposes C) reacts D) disappears 29) 30) Which of the following are strong electrolytes? HCl HC2H3O2 NH3 KCl A) HCl, HC2H3O2, NH3, KCl 30) B) HCl, NH3, KCl C) HCl, KCl D) HC2H3O2, KCl E) HCl, HC2H3O2, KCl 31) What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)? A) H+ and OH- B) K+ and H+ C) K+ and NO3-31) D) OH- only E) H+ and NO3-5

6 32) Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4. Which ion(s) is/are spectator ions in the reaction? A) Ba2+ and SO4 2-32) B) Ba2+ only C) SO4 2- and I- D) Na+ only E) Na+ and I- 33) The net ionic equation for the reaction between aqueous solutions of HF and KOH is. A) HF + OH- H2O + F- B) HF + KOH H2O + K+ + F- 33) C) HF + K+ + OH- H2O + KF D) H+ + F- + K+ + OH- H2O + K+ + F- E) H+ + OH- H2O 34) The spectator ions in the reaction between aqueous hydrofluoric acid and aqueous barium hydroxide are. A) F- and Ba2+ B) OH- and F- C) H+, OH-, F-, and Ba2+ D) OH-, F-, and Ba2+ E) Ba2+ only 34) 35) Which of the following are strong acids? HI HNO3 HF HBr A) HI, HNO3, HF, HBr 35) B) HI, HF, HBr C) HNO3, HF, HBr D) HF, HBr E) HI, HNO3, HBr 6

7 36) Which hydroxides are strong bases? Sr(OH)2 KOH NaOH Ba(OH)2 36) A) Sr(OH)2, KOH, NaOH, Ba(OH)2 B) KOH, Ba(OH)2 C) KOH, NaOH, Ba(OH)2 D) KOH, NaOH E) None of these is a strong base. 37) When gold dissolves in aqua regia, what is reduced (google the term and?) 37) H+ NO3 - Cl- H2O Au A) NO3 - B) Cl- C) Au D) H2O E) H+ 38) Based on the equations below, which metal is the most active? 38) Pb(NO3)2 (aq) + Ni (s) Ni(NO2)2 (aq) + Pb (s) Pb(NO3)2 (aq) + Ag (s) No reaction Cu(NO3)2 (aq) + Ag (s) No reaction A) N B) Ni C) Cu D) Pb E) Ag 39) How many grams of H3PO4 are in 175 ml of a 3.5 M solution of H3PO4? 39) A) 612 B) 20 C) 4.9 D) 60 E) ) How many grams of CH3OH must be added to water to prepare 150 ml of a solution that is 2.0 M CH3OH? 40) A) B) 9.6 C) D) 4.3 E) ) The molarity (M) of an aqueous solution containing 22.5 g of sucrose (C12H22O11) in 35.5 ml of solution is. A) B) C) D) 1.85 E) ) 7

8 42) The concentration of iodide ions in a M solution of barium iodide is. A) M B) M C) M D) M E) M 42) 43) Which of the following is soluble in water at 25 C? 43) A) Fe(NO3)2 B) Fe(OH)2 C) FeS D) FeCO3 E) Fe3(PO4)2 44) When aqueous solutions of are mixed, a precipitate forms. A) Li2CO3 and CsI 44) B) NaI and KBr C) KOH and Ba(NO3)2 D) NiBr2 and AgNO3 E) K2SO4 and CrCl3 45) With which of the following will ammonium ion form an insoluble salt? A) sulfate B) carbonate C) sulfate and carbonate D) chloride E) none of the above 45) 46) Which one of the following is a diprotic acid? A) phosphoric acid B) hydrofluroric acid C) nitric acid D) sulfuric acid E) chloric acid 46) 47) Which one of the following is a weak acid? 47) A) HClO4 B) HI C) HCl D) HF E) HNO3 48) In which species does sulfur have the highest oxidation number? A) S8 (elemental form of sulfur) 48) B) K2SO4 C) SO2 D) H2SO3 E) H2S 8

9 49) Oxidation cannot occur without. A) oxygen B) water C) air D) reduction E) acid 49) 50) Which of the following is an oxidation-reduction reaction? A) Ba(C2H3O2)2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaC2H3O2 (aq) 50) B) H2CO3 (aq) + Ca(NO3)2 (aq) 2HNO3 (aq) + CaCO3 (s) C) HCl (aq) + NaOH (aq) H2O (l) + NaCl (aq) D) AgNO3 (aq) + HCl (aq) AgCl (s) + HNO3 (aq) E) Cu (s) + 2AgNO3 (aq) 2Ag (s) + Cu(NO3)2 (aq) 51) Which one of the following is a correct expression for molarity? A) µmol solute/l solution B) mol solute/ml solvent C) mol solute/kg solvent D) mmol solute/ml solution E) mol solute/l solvent 51) 52) What are the respective concentrations (M) of Fe3+ and I- afforded by dissolving mol FeI3 in water and diluting to 725 ml? 52) A) and B) and C) and D) and E) and ) How many milliliters of a stock solution of 11.1 M HNO3 would be needed to prepare L of M HNO3? 53) A) B) C) 22.5 D) 2.78 E) ) How many milliliters of M HClO4 solution are needed to neutralize ml of M NaOH? 54) A) B) 83.7 C) D) 29.9 E) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 55) How many moles of Co2+ are present in L of a M solution of CoI2? 55) 56) Calculate the concentration (M) of sodium ions in a solution made by diluting 40.0 ml of a M solution of sodium sulfide to a total volume of 300 ml. 56) 9

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