1.1. This question is about gases in the atmosphere.

The box gives the names of some gases in the atmosphere.

Choose gases from the box to answer these questions. Each gas may be used once, more than once or not at all.

i) Identify a noble gas.

(1)

ii) Identify a gas that makes up about 78% of the atmosphere.

(1)

iii) Identify a greenhouse gas.

(1)

iv) Identify a gas produced by the thermal decomposition of calcium carbonate.

(1)

1.2. Sulfur reacts with oxygen to produce sulfur dioxide gas.

i) Write a chemical equation for this reaction.

(1)

ii) State an environmental problem caused when sulfur dioxide gas dissolves in water in the atmosphere.

(1)