general, organic & biological chemistry, 5e (timberlake) chapter 7

General, Organic & Biological Chemistry, 5e (Timberlake)Chapter 7 Chemical Reactions and Quantities

7.1 Multiple-Choice Questions

1) A chemical equation is balanced whenA) the total number of molecules is the same in reactants and products.B) the total number of ions is the same in reactants and products.C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products.D) the number of atoms of each element is the same in reactants and products.E) the charge on each atom is the same in reactants and products.Answer: DObjective: 7.1Global Outcomes: GO2

2) In any balanced chemical equation, the number of each type of atom on both sides of the equation isA) doubled.B) the same.C) decreased by one.D) increased by one.E) dependent on the temperature.Answer: BObjective: 7.1Global Outcomes: GO2

3) Which of the following gives the balanced equation for this reaction?

K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3

A) KPO4 + CaNO3 + KNO3B) K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 3KNO3C) 2K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 6KNO3D) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3E) K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3Answer: DObjective: 7.1Global Outcomes: GO2

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4) Which of the following correctly gives the best coefficients for the reaction below?

N2H4 + H2O2 → N2 + H2O

A) 1, 1, 1 ,1B) 1, 2, 1, 4C) 2, 4, 2, 8D) 1, 4, 1, 4E) 2, 4, 2, 4Answer: BObjective: 7.1Global Outcomes: GO2

5) What coefficient is placed in front of O2 to complete the balancing of the following equation?

C5H8 + ? O2 → 5CO2 + 4H2O

A) 1B) 3C) 5D) 7E) 9Answer: DObjective: 7.1Global Outcomes: GO2

6) What is the coefficient of hydrogen, H2, when the following equation is balanced?

Al + H2SO4 → Al2(SO4)3 + ? H2

A) 1B) 2C) 3D) 4E) 5Answer: CObjective: 7.1Global Outcomes: GO2


7) In this reaction, what is the coefficient for calcium oxide?

CaO(s) + CO2(g) → CaCO3(s)

A) 1B) 2C) 3D) 4E) 5Answer: AObjective: 7.1Global Outcomes: GO2

8) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride?

Pb(NO3)2(aq) + NaCl(aq) → PbCl2(s) + NaNO3(aq)

A) 1B) 2C) 3D) 4E) 5Answer: BObjective: 7.1Global Outcomes: GO2

9) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H2?

Fe(s) + HCl(aq) → FeCl3(aq) + H2(g)

A) 1B) 2C) 3D) 4E) 5Answer: CObjective: 7.1Global Outcomes: GO2


10) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride?

Al(s) + Cl2(g) → AlCl3(s)


Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the question(s) that follow about this reaction.

C5H12 + ? O2 → ? CO2 + ? H2O

11) What is the coefficient for oxygen in the balanced equation?A) 2 B) 4C) 5D) 6E) 8Answer: EObjective: 7.1Global Outcomes: GO2

12) What is the coefficient for carbon dioxide in the balanced equation?A) 2B) 4C) 5D) 6E) 8Answer: CObjective: 7.1Global Outcomes: GO2

13) What is the coefficient for water in the balanced equation?A) 2B) 4C) 5D) 6E) 8Answer: DObjective: 7.1Global Outcomes: GO2

14) In a ________ reaction, two or more elements or compounds form one product.A) decompositionB) single replacementC) dehydrationD) double replacementE) combinationAnswer: E


Objective: 7.2Global Outcomes: GO2

15) The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction.

2H2O → 2H2 + O2

A) combinationB) single replacementC) dehydrationD) decompositionE) double replacementAnswer: DObjective: 7.2Global Outcomes: GO2

16) What is the classification for this reaction?

SO3 (g) + H2O (l) → H2SO4(l)

A) decompositionB) combinationC) replacementD) double replacementE) oxidation reductionAnswer: BObjective: 7.2Global Outcomes: GO2


17) The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?

2C(s) + O2(g) → 2CO(g)

A) single replacementB) double replacementC) combinationD) catalyticE) endothermicAnswer: CObjective: 7.2Global Outcomes: GO2

18) What is the classification for this unbalanced reaction?

Fe + HCl → FeCl3 + H2

A) dehydrationB) combinationC) decompositionD) single replacementE) double replacementAnswer: DObjective: 7.2Global Outcomes: GO2

19) The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction?

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

A) single replacementB) double replacementC) combinationD) oxidationE) endothermicAnswer: DObjective: 7.2Global Outcomes: GO2


20) Which of the following is an oxidation-reduction reaction?A) CaCl2 + Na2SO4 → CaSO4 + 2NaClB) KOH + HNO3 → H2O + KNO3C) N2 + O2 → 2NOD) AgNO3 + NaCl → AgCl + NaNO3E) Al2(SO4)3 + 6KOH → 2Al(OH)3 + 3K2SO4Answer: CObjective: 7.3Global Outcomes: GO2

21) What is oxidized and what is reduced in the following reaction?

2Al(s) + 3Br2(g) → 2AlBr3(s)

A) Al is oxidized and Br2 is reduced.B) AlBr3 is reduced and Br2 is oxidized.C) Al is reduced and Br2 isoxidized.D) AlBr3 is reduced and Al is oxidized.E) AlBr3 is oxidized and Al is reduced.Answer: AObjective: 7.3Global Outcomes: GO2

22) Which of the following describes an oxidation reaction?A) loss of electrons or loss of oxygenB) loss of electrons or gain of oxygenC) loss of electrons or gain of hydrogenD) gain of electrons or gain of oxygenE) gain of electrons or loss of HAnswer: BObjective: 7.3Global Outcomes: GO2

23) In an oxidation-reduction reaction, the substance oxidized alwaysA) takes on oxygen atoms.B) shows a loss of electrons.C) gives up hydrogen atoms.D) shows a gain of electrons.E) becomes a charged species.Answer: BObjective: 7.3Global Outcomes: GO2


24) In this reaction, what is the substance oxidized?

Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)

A) chlorineB) zinc chlorideC) hydrogenD) zincE) oxygenAnswer: DObjective: 7.3Global Outcomes: GO2

25) In an oxidation-reduction reaction, the substance reduced alwaysA) takes on oxygen atoms.B) shows a loss of electrons.C) gives up hydrogen atoms.D) shows a gain of electrons.E) becomes a charged species.Answer: DObjective: 7.3Global Outcomes: GO2

26) How many moles of iron are present in 3.15 × 1024 atoms of iron?A) 5.23 molesB) 1.90 molesC) 292 molesD) 0.523 molesE) 1.90 × 1048 moles Answer: AObjective: 7.4Global Outcomes: GO4

27) How many atoms of neon are present in 1.30 moles of neon?A) 3.15 × 1023

atoms

B) 4.63 × 1023 atoms

C) 7.83 × 1023 atoms

D) 6.02 × 1023 atoms

E) 7.83 × 1024 atoms

Answer: CObjective: 7.4Global Outcomes: GO4


28) One mole of particles of any substance contains how many particles?A) 106

B) 3 × 10-10

C) 3 × 1010

D) 6.02 × 1023

E) 6.02 × 10-23

Answer: DObjective: 7.4Global Outcomes: GO4

29) Avogadro's number is the number ofA) particles in 1 mole of a substance.B) amu in 1 mole of a substance.C) grams in 1 mole of a substance.D) moles in 6.02 × 1023

grams of an element.

E) moles in 6.02 × 1023 amu of an element.

Answer: AObjective: 7.4Global Outcomes: GO4

30) How many molecules of water, H2O, are present in 75.0 g of H2O?A) 75.0 moleculesB) 4.17 moleculesC) 7.53 × 1024 molecules D) 2.51 × 1024

molecules

E) 5.02 × 1024 molecules


31) How many hydrogen atoms are present in 75.0 g of H2O?A) 75.0 atomsB) 4.17 atomsC) 7.53 × 1024

atoms

D) 2.51 × 1024 atoms

E) 5.02 × 1024 atoms

Answer: EObjective: 7.5Global Outcomes: GO4


32) The molar mass of potassium isA) 19 g.B) 31.0 g.C) 6.02 × 1023

grams.

D) 39.1 g.E) 15g.Answer: DObjective: 7.5Global Outcomes: GO4

33) One mole of helium gas has a mass ofA) 1.00 g.B) 2.00 g.C) 3.00 g.D) 4.00 g.E) 8.00 g.Answer: DObjective: 7.5Global Outcomes: GO4

34) How many moles of water, H2O, are present in 75.0 g of H2O?A) 4.41 molesB) 4.16 molesC) 75.0 molesD) 7.50 molesE) 1.35 × 103 moles Answer: BObjective: 7.5Global Outcomes: GO4

35) 0.100 mole of lithium has a mass of A) 3.00 g.B) 0.300 g.C) 6.94 g.D) 0.694 g.E) 0.700 g.Answer: DObjective: 7.5Global Outcomes: GO4

36) Calculate the molar mass of potassium chloride, KCl.A) 74.6 gB) 54.5 gC) 6.74 gD) 67.4 gE) 19.0 gAnswer: AObjective: 7.5Global Outcomes: GO4

37) What is the molar mass of copper(II) sulfate, CuSO4?A) 16.0 gB) 63.6 gC) 111.6 gD) 159.6 gE) 319.2 g



38) Calculate the molar mass of magnesium chloride, MgCl2. A) 24.3 gB) 95.2 gC) 125.9 gD) 59.8 gE) 70.0 gAnswer: BObjective: 7.5Global Outcomes: GO4

39) What is the molar mass of sodium phosphate, Na3PO4?A) 119 gB) 308 gC) 164 gD) 226 gE) 354 gAnswer: CObjective: 7.5Global Outcomes: GO4

40) How many moles of carbon atoms are there in 0.500 mole of C2H6?A) 0.500 molesB) 1.00 molesC) 3.00 molesD) 6.02 × 1023 molesE) 4.00 molesAnswer: BObjective: 7.5Global Outcomes: GO4


41) What is the molar mass of sucrose (C12H22O11)?A) 29.0 gB) 50.2 gC) 210 gD) 342 gE) 182 gAnswer: DObjective: 7.5Global Outcomes: GO4

42) One mole of neon atoms has a mass ofA) 6.02 × 1023 grams.B) 14.0 g.C) 10.0 g.D) 20.2 g.E) 30.2 g.Answer: DObjective: 7.5Global Outcomes: GO4

43) The molar mass of C3H8O2 isA) 76.0 g.B) 60.0 g.C) 29.0 g.D) 69.0 g.E) 52.0 g.Answer: AObjective: 7.5Global Outcomes: GO4

44) The molar mass of calcium hydroxide, Ca(OH)2, isA) 58.1 g.B) 57.1 g.C) 74.1 g.D) 114.2 g.E) 38.0 g.Answer: CObjective: 7.5Global Outcomes: GO4


45) What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?A) 71.3 gB) 118 gC) 150. gD) 214 gE) 263 gAnswer: EObjective: 7.5Global Outcomes: GO4

46) 4.00 moles of sodium have a mass ofA) 4.60 g.B) 11.0 g.C) 23.0 g.D) 44.0 g.E) 92.0 g.Answer: EObjective: 7.5Global Outcomes: GO4

47) How many moles of K2SO4 are in 15.0 g of K2SO4?A) 0.172 molesB) 2.61 × 103 molesC) 0.111 molesD) 0.0861 molesE) 0.119 molesAnswer: DObjective: 7.5Global Outcomes: GO4

48) 3.00 moles of NO2 have a mass ofA) 138 g.B) 46.0 g.C) 30.0 g.D) 90.0 g.E) 45.0 g.Answer: AObjective: 7.5Global Outcomes: GO4


49) 1.25 moles of PbO2 have a mass ofA) 191 g.B) 279 g.C) 178 g.D) 239 g.E) 299 g.Answer: EObjective: 7.5Global Outcomes: GO4

50) How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?A) 79.9 gB) 35.9 gC) 63.8 gD) 51.9 gE) 160. gAnswer: AObjective: 7.5Global Outcomes: GO4

51) How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?A) 180. gB) 639 gC) 103 gD) 426 gE) 50.7 gAnswer: BObjective: 7.5Global Outcomes: GO4


52) Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3

produced?

4Fe(s) + 3O2 (g) → 2Fe2O3(s)

A)

B)

C)

D)

E)

Answer: EObjective: 7.6Global Outcomes: GO4

For the question(s) that follow, consider the following equation.

2Mg + O2 → 2MgO

53) The number of moles of oxygen gas needed to react with 4.0 moles of Mg isA) 1.0 mole.B) 2.0 moles.C) 3.0 moles.D) 4.0 moles.E) 6.0 moles.Answer: BObjective: 7.6Global Outcomes: GO4

54) The number of moles of MgO produced when 0.20 mole of O2 reacts completely is

A) 0.10 mole.B) 0.20 mole.C) 0.40 mole.D) 0.60 mole.E) 0.80 mole.Answer: CObjective: 7.6Global Outcomes: GO4


55) How many moles of magnesium are needed to react with 0.50 mole of O2?A) 0.50 moleB) 1.0 molesC) 2.0 molesD) 3.0 molesE) 4.0 molesAnswer: BObjective: 7.6Global Outcomes: GO4

56) When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl2, how many moles of aluminum chloride are produced? A) 1 moleB) 2 molesC) 3 molesD) 4 molesE) 5 molesAnswer: DObjective: 7.6Global Outcomes: GO4

57) In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with two moles of nitrogen?A) 2 molesB) 4 molesC) 6 molesD) 8 molesE) 10 molesAnswer: CObjective: 7.6Global Outcomes: GO4


For the question(s) that follow, consider the following balanced equation.

Mg3N2(s) + 6H2O(l) → 3Mg (OH)2(s) + 2NH3(g)

58) What is the correct form of the conversion factor needed to convert the number of moles of H2O to the number of moles of NH3

produced?

A)

B)

C)

D)

E)

Answer: AObjective: 7.6Global Outcomes: GO4

59) When 2 moles of Mg3N2 are allowed to react, how many moles of H2O also react?A) 1 moleB) 4 molesC) 6 molesD) 8 molesE) 12 molesAnswer: EObjective: 7.6Global Outcomes: GO4

For the question(s) that follow, consider the following equation.

2Mg + O2 → 2MgO

60) How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg?A) 30.4 g B) 50.4 gC) 60.8 gD) 101 gE) 201 gAnswer: DObjective: 7.7Global Outcomes: GO4


For the question(s) that follow, consider the following balanced equation.

Mg3N2(s) + 6H2O(l) → 3Mg (OH)2(s) + 2NH3(g)

61) How many grams of H2O are needed to produce 150 g of Mg(OH)2?A) 46 gB) 18 gC) 130 gD) 93 gE) 23 g Answer: DObjective: 7.7Global Outcomes: GO4

62) When 36.0 g of H2O react, how many grams of NH3 are produced? A) 34.0 gB) 10.0 gC) 5.67 gD) 11.3 gE) 102 gAnswer: DObjective: 7.7Global Outcomes: GO4

63) How many grams of hydrogen are needed to produce 1.80 g of water according to this equation?

2H2 + O2 → 2H2O

A) 0.100 gB) 0.180 gC) 0.200 gD) 2.00 gE) 4.00 gAnswer: CObjective: 7.7Global Outcomes: GO4


64) In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below.

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)


65) Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 react with excess HCl according to the following equation.

Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)

A) 155 gB) 72.9 gC) 65.4 gD) 32.6 gE) 16.3 gAnswer: CObjective: 7.7Global Outcomes: GO4

66) How many grams of NO are required to produce 145 g of N2 in the following reaction?

4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

A) 186 gB) 155 gC) 125 gD) 129 gE) 145 gAnswer: AObjective: 7.7Global Outcomes: GO4


67) How many grams of N2 are produced from 100. g of NH3 in the following reaction?

4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

A) 165 gB) 132 gC) 125 gD) 206 gE) 7.35 gAnswer: DObjective: 7.7Global Outcomes: GO4

68) How many grams of CO2 are produced from 125 g of O2 and excess CH4?

CH4 + 2O2 → CO2 + 2H2O A) 125 g of CO2B) 62.5 g of CO2C) 172 g of CO2D) 85.9 g of CO2E) 250. g of CO2Answer: DObjective: 7.7Global Outcomes: GO4

69) When 3.05 moles of CH4 are mixed with 5.03 moles of O2 the limiting reactant is

CH4 + 2O2 → CO2 + 2H2O A) CH4.B) O2.C) CO2.D) H2O.Answer: BObjective: 7.8Global Outcomes: GO4


70) When 85.0 g of CH4 are mixed with 160. g of O2 the limiting reactant is

CH4 + 2O2 → CO2 + 2H2O A) CH4.B) O2.C) CO2.D) H2O.Answer: BObjective: 7.8Global Outcomes: GO4

71) When 10.0 g of NH3 reacts, the actual yield of N2 is 8.50 g. What is the percent yield?

4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

A) 85.0%B) 51.5%C) 20.6%D) 41.3%E) 8.5%Answer: DObjective: 7.8Global Outcomes: GO7

72) When 85.0 g of CH4 are mixed with 160. g of O2 what is the maximum amount of CO2 that can be produced?

CH4 + 2O2 → CO2 + 2H2O

A) 2.50 molesB) 5.00 molesC) 5.31 molesD) 7.81 molesAnswer: AObjective: 7.8Global Outcomes: GO4


73) When 60.0 g of CH4 reacts with excess O2, the actual yield of CO2 is 112 g. What is the percent yield?

CH4 + 2O2 → CO2 + 2H2O

A) 53.6 %B) 187 %C) 67.9 %D) 46.4 %Answer: CObjective: 7.8Global Outcomes: GO4

74) Find the mass of AlCl3 that is produced when 10.0 grams of Al2O3 react with 10.0 g of HCl according to the following equation.

Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(aq)


75) What type of reaction is: CH4 + 2O2 → CO2 + 2H2O + 218 kcal?A) an endothermic reactionB) an exothermic reactionC) a single replacement reactionD) a combination reactionE) a decomposition reactionAnswer: BObjective: 7.9Global Outcomes: GO2

76) How many kcal are produced when 32.0 g of CH4 react?

CH4 + 2O2 → CO2 + 2H2O + 218 kcal

A) 218 kcalB) 109 kcalC) 436 kcalD) 6.81 kcalE) 698 kcalAnswer: CObjective: 7.9Global Outcomes: GO4

77) For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2 (g)?A) 68.5 kcalB) 137 kcalC) 274 kcal


D) 190. kcalE) 548 kcalAnswer: CObjective: 7.9Global Outcomes: GO4

78) For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to react 50.0 g H2O(l)?A) 380. kcalB) 137 kcalC) 274 kcalD) 190. kcalE) 760. kcalAnswer: DObjective: 7.9Global Outcomes: GO4

79) If the reaction shown below is exothermic, the energy level of the reactants is

H2 + O2 → 2H2O

A) lower than that of the products.B) higher than that of the products.C) the same as that of the products.D) possibly lower, possibly higher than that of the products.E) higher than the activation energy of the reaction.Answer: BObjective: 7.9Global Outcomes: GO2

80) In an endothermic reactionA) heat flows out of the system.B) energy is absorbed by the system.C) the temperature of the system increases.D) the products have less energy that the reactants.E) the products have the same energy that the reactants.Answer: BObjective: 7.9Global Outcomes: GO2


81) Any reaction that absorbs 150 kcal of energy can be classified asA) endothermic.B) exothermic.C) activated.D) reduction.E) oxidation.Answer: AObjective: 7.9Global Outcomes: GO2

82) The ________ is the energy difference between reactants and products in a chemical reaction.A) transition energyB) activation energyC) product energyD) overall energyE) heat of reactionAnswer: EObjective: 7.9Global Outcomes: GO2

83) The ________ is the minimum energy needed for a chemical reaction to begin.A) reaction energyB) activation energyC) energy of reactantsD) energy of productsE) heat of reactionAnswer: BObjective: 7.9Global Outcomes: GO2

84) A reaction that releases energy as it occurs is classified as a(n)A) endothermic reaction.B) exothermic reaction.C) oxidation-reduction reaction.D) catalyzed reaction.E) decomposition reaction.Answer: BObjective: 7.9Global Outcomes: GO2


7.2 Bimodal Questions

1) In this reaction, what is the correct coefficient for hydrogen gas?

? H2 + ? O2 → ? H2O


Barium chloride and sodium sulfate react according to the following equation.

BaCl2 + Na2SO4 → BaSO4 + 2NaCl

Answer the question(s) that follow about this reaction.

2) How many moles of barium sulfate are produced from 0.100 mole of barium chloride?A) 0.0100 moleB) 0.100 moleC) 0.200 moleD) 1.00 moleE) 2.00 molesAnswer: BObjective: 7.6Global Outcomes: GO4

3) How many grams of barium sulfate can be produced from 20.8 g of barium chloride?A) 1.37 gB) 2.33 gC) 23.3 gD) 137 gE) 233 gAnswer: CObjective: 7.7Global Outcomes: GO4


4) How many grams of barium chloride are needed to make 100. grams of barium sulfate?A) 44.9 gB) 89.2 gC) 208.3 gD) 233.3 gE) 46.6 gAnswer: BObjective: 7.7Global Outcomes: GO4

Answer the question(s) that follow about the following reaction.

2H2O2 → 2H2O + O2

5) How many moles of oxygen gas can 0.88 mole of hydrogen peroxide (H2O2) produce, if decomposition is complete?A) 0.50 moleB) 0.88 moleC) 1.8 molesD) 2.0 molesE) 0.44 moleAnswer: EObjective: 7.6Global Outcomes: GO4

6) How many grams of water will 100. grams of hydrogen peroxide (H2O2) produce?A) 3600 gB) 360. gC) 5.88 gD) 52.9 gE) 106 gAnswer: DObjective: 7.7Global Outcomes: GO4

7) How many grams of hydrogen peroxide (H2O2) are needed to produce 25.0 g of oxygen?A) 106 gB) 26.6 gC) 5.88 gD) 25.0 gE) 53.1 gAnswer: EObjective: 7.7Global Outcomes: GO4


8) How many moles of hydrogen peroxide (H2O2) are needed to produce 5.0 moles of water?A) 1.0 moleB) 2.0 molesC) 4.0 molesD) 5.0 molesE) 8.0 molesAnswer: DObjective: 7.6Global Outcomes: GO4

7.3 Short Answer Questions

1) What type of reaction is the following?

2KClO3 → 2KCl + 3O2Answer: decomposition reactionObjective: 7.2Global Outcomes: GO2


Zn + 2HCl → ZnCl2 + H2Answer: single replacement reactionObjective: 7.2Global Outcomes: GO2


2KClO3 → 2KCl + 3O2Answer: decomposition reactionObjective: 7.2Global Outcomes: GO2


Zn + 2HCl → ZnCl2 + H2Answer: single replacement reactionObjective: 7.2Global Outcomes: GO2

5) The number of particles in 1 mole of hydrogen gas is ________.Answer: 6.02 × 1023Objective: 7.4Global Outcomes: GO4


6) The molar mass of copper(II) nitrate, Cu(NO3)2 is ________.Answer: 187.6 gObjective: 7.5Global Outcomes: GO4

7) What is the mass of 1 mole of argon gas?Answer: 40.0 gObjective: 7.5Global Outcomes: GO4

8) What is the mass of 1 mole of helium gas?Answer: 4.00 gObjective: 7.5Global Outcomes: GO4

9) Acetylene gas, C2H2, reacts with oxygen according to the following equation. If 1.00 mole of acetylene reacts completely with sufficient oxygen, how many moles of carbon dioxide are produced?

2C2H2 + 5O2 → 4CO2 + 2H2OAnswer: 2.00 moles of CO2 Objective: 7.6Global Outcomes: GO4

7.4 True/False Questions

1) The following reaction is balanced.

KClO3 → KCl + O2Answer: FALSEObjective: 7.1Global Outcomes: GO2

2) The following is a decomposition reaction.

2KClO3 → 2KCl + 3O2Answer: TRUEObjective: 7.2Global Outcomes: GO2

3) Loss of electrons is an oxidation. Answer: TRUEObjective: 7.3Global Outcomes: GO2

4) Avogadro's number is the number of grams in a mole.Answer: FALSEObjective: 7.4Global Outcomes: GO4

5) The molar mass of silver is 47 g.Answer: FALSEObjective: 7.5Global Outcomes: GO4

6) The molar mass of magnesium is 24.3 g.Answer: TRUE


Objective: 7.5Global Outcomes: GO4

7) The mass of one mole of water is 18.0 g.Answer: TRUEObjective: 7.5Global Outcomes: GO4

8) The molar mass of chlorine gas is 35.5 g.Answer: FALSEObjective: 7.5Global Outcomes: GO4

9) The molar mass of copper(II) chloride is 134.5 g.Answer: TRUEObjective: 7.5Global Outcomes: GO4

10) In the reaction of hydrogen gas with oxygen gas to produce water, 1 mole of oxygen gas can produce 2 moles of water, given sufficient hydrogen available.Answer: TRUEObjective: 7.6Global Outcomes: GO4

11) In the reaction of hydrogen gas with oxygen gas to produce water, 16.0 g of oxygen gas can produce 9.00 g of water, given sufficient hydrogen available.

2H2 + O2 → 2H2OAnswer: FALSEObjective: 7.7Global Outcomes: GO4

12) The % yield is the ratio of the theoretical yield to the actual yield multiplied by 100.Answer: FALSEObjective: 7.9Global Outcomes: GO2

13) In an exothermic reaction, heat is a product.Answer: TRUEObjective: 7.9Global Outcomes: GO1


7.5 Matching Questions

Identify the energy associated with each of the labeled parts of the following diagram.

A) energy of reactantsB) heat of reactionC) activation energyD) energy of products

1) Region AObjective: 7.9Global Outcomes: GO3

2) Region BObjective: 7.9Global Outcomes: GO3

3) Region CObjective: 7.9Global Outcomes: GO3

4) Region DObjective: 7.9Global Outcomes: GO3

Answers: 1) A 2) C 3) B 4) D


Identify the letter of the diagram corresponding to the given type of reaction.

A

B

A) Diagram AB) Diagram B

5) endothermic reactionObjective: 7.9Global Outcomes: GO3

6) exothermic reactionObjective: 7.9Global Outcomes: GO3

Answers: 5) B 6) A


general, organic & biological chemistry, 5e (timberlake) chapter 7

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