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Chapter 7Chemical Reactions

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a. Formation of a precipitateb. Color changec. Emission of lightd. Evolution of gase. All of the above

7.1 Which of the following is evidence that a chemical reaction has occurred?

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a. 1b. 2c. 3d. 4e. 6

7.4 What is the coefficient for aluminum after the following equation is balanced?Al + O2 → Al2O3

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a. 4b. 6c. 12d. 8e. 10

7.5 What is the sum of the coefficients after the following equation is balanced?

Al2O3 + H2SO4 → Al2(SO4)3 + H2O

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a. 0.66b. 1.0c. 1.66d. 1.5e. 2.5

7.6 When the following equation is balanced, what is the ratio of oxygen molecules to water molecules?

C5H10 + O2 → CO2 + H2O

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a. Li2SO4

b. KOHc. CaCO3

d. NH4NO3

e. NaCl

7.8 Which of the following compounds is INSOLUBLE in water?

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a. electrical compound.b. strong electrolyte.c. weak electrolyte.d. weak cation.e. Nonelectrolyte.

7.9 A substance dissolved in water that CANNOT conduct an electric current is called a

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a. CaNO3

b. AgClc. Ca(NO3)2

d. AgCl2e. CaAg

7.11 Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride.

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a. KClb. BaNO3

c. K2Cl

d. Ba(NO3)2

e. No solid is formed

7.12 Identify the solid product formed from the balanced reaction of potassium nitrate and barium chloride.

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a. Mg2+(aq)b. OH–(aq)c. Mg(OH)2(s)

d. Two of the abovee. All of the above

7.14 Which of the following is a term in the complete ionic equation for the following reaction?

LiOH(aq) + MgCl2(aq) →

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a. Waterb. Sodium chloridec. Potassium perchlorated. Potassium hydridee. Potassium chlorate

7.18 What salt is formed from the neutralization reaction between perchloric acid and potassium hydroxide?

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a. Waterb. Sodium chloridec. Oxygend. Carbon dioxidee. Ammonium chloride

7.19 When an acid reacts with a base, what product is typically formed?

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a. Ammoniab. Nitrogen dioxidec. Hydrogend. Carbon dioxidee. Nitrogen

7.20 Which gas is released from the reaction of calcium carbonate with nitric acid?

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a. 1b. 3c. 4d. 5e. 6

7.21 How many molecules of carbon dioxide are produced from the combustion of one molecule of propane (C3H8)?

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a. Synthesis/combinationb. Decompositionc. Single displacementd. Double displacemente. Two of the above

7.23 What type of reaction is the following?

HgO (s) → Hg(l) + O2(g)

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a. Oxidation–reductionb. Combustionc. Synthesisd. All of the above

7.24 What type of reaction is the following? 4Fe(s) + O2(g) → 2Fe2O3(s)

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a. Precipitationb. Acid–basec. Double displacementd. Single displacement

7.25 What type of reaction is the following?

Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)

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a. Na2SO4

b. H2SO4

c. SO2 gas

d. NaNO2

e. N2 gas

7.26 When NaHSO3 reacts with HNO3, what product is formed?

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a. CH4(g) and O2(g)

b. H2(g) and O2(g)

c. CO2(g) and H2O(g)

d. C2H6(g)

e. None of the above

7.30 When compounds containing carbon and hydrogen react with oxygen in combustion reactions what is/are produced?