Chapter 13 Chemical Reactions

Which set of coefficients balance the following chemical equation? ___ AlO3H3 > ___ Al2O3 + ___ H2O a. 2, 1, 3 b. 4, 2, 6 c. 1, 3, 2 d. 8, 4, 5

a. 2, 1, 3

What happens to the corrosive properties of an acid and a base after they neutralize each other? Why? a. The corrosive properties are neutralized because the acid and base no longer exist. b. The corrosive properties are unaffected because salt is a corrosive agent. c. The corrosive properties are doubled because the acid and base are combined in the salt. d. The corrosive properties remain the same when the salt is mixed into water.

a. The corrosive properties are neutralized because the acid and base no longer exist.

Carbon dioxide makes rainwater acidic by a. forcing out the dissolved oxygen. b. reacting with the water to form carbonic acid. c. lowering its pH. d. raising its pH.

b. reacting with the water to form carbonic acid.

When the hydroxide ion concentration equals 1x10-5 moles per liter, what is the pH of the solution? a. 2 b. 12 c. 9 d. 5

c. 9

Which atom is oxidized, the light colored atom or the darker colored atom? a. Both of the atoms are oxidized. b. Neither of the atoms is oxidized. c. Only the darker colored atom is oxidized. d. Only the lighter colored atom is oxidized.

c. Only the darker colored atom is oxidized.

Pure water contains only H3O+ ions only HO- ions both H3O+ and HO- ions. neither H3O+ nor HO- ions.

c. both H3O+ and HO- ions.

What is the hydroxide ion concentration in an aqueous solution where the pH equals 5? a. The hydronium ion concentration equals 1x10-9. b. The hydronium ion concentration equals 1x10-7. c.The hydronium ion concentration equals 1x10-5. d. The hydronium ion concentration equals 1x10-3.

c.The hydronium ion concentration equals 1x10-5.

When a hydronium ion concentration equals 1x10-13 moles per liter, what is the pH of the solution? a. 6 b. 8 c. 1 d. 13

d. 13

Both corrosion and combustion a.involve oxidation by oxygen. b.cause billions of dollars of damage every year. c. produce sufficient energy for the functioning of our society. d. Two of the above are correct.

d. Two of the above are correct.

The purpose of coefficients in chemical equations is to make a. the equation balance by splitting the chemical formula b. all the subscripts within the chemical formula equal c. the number of times each element appears as a reactant and as a product the same d. the number of molecules of reactants and products equal

the number of times each element appears as a reactant and as a product the same.