Oxygen (22.4.1)

Question 1

• Oxygen comprises only 21% of air, but accounts for 49.5% of the earth’s crust.

Answer 1

• Oxygen comprises only 21% of air, but accounts for 49.5% of the earth’s crust.

Question 2

• Stratospheric ozone (O3) absorbs ultraviolet radiation, while ground-level ozone is damaging.

Answer 2

• Stratospheric ozone (O3) absorbs ultraviolet radiation, while ground-level ozone is damaging.

Question 3

• Most nonmetal oxides are acidic in water, while most metal oxides are basic in water. Amphoteric oxides can react with acids and bases.

Answer 3

• Most nonmetal oxides are acidic in water, while most metal oxides are basic in water. Amphoteric oxides can react with acids and bases.

Question 4

• A peroxide is a compound that contains oxygen in the 1– oxidation state.

Answer 4

• A peroxide is a compound that contains oxygen in the 1– oxidation state.