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Gases in the atmosphere

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Question 1

The atmosphere consists of a mixture of different gases.

a.

The pie chart shows the relative percentages of gases in dry air.

A pie chart representing the composition of dry air on Earth.

Label the pie chart with the name of the gas that makes up this second-largest portion of dry air (approximately 21%21\%21%).

[1]
b.

What is the approximate percentage of nitrogen in dry air?

  • A: 1%1\%1%
  • B: 21%21\%21%
  • C: 78%78\%78%
  • D: 99%99\%99%
[1]
c.

Use words from the box to complete the sentences. Every word may be used once, more than once, or not at all.

greenhouse∣reactive∣toxic∣unreactive∣water \text{greenhouse} \quad | \quad \text{reactive} \quad | \quad \text{toxic} \quad | \quad \text{unreactive} \quad | \quad \text{water} greenhouse∣reactive∣toxic∣unreactive∣water
  • Argon is a noble gas used in double-glazed windows because it is extremely ______________.
  • Carbon dioxide is an important ______________ gas that absorbs heat radiated from the Earth's surface.
[2]
d.

Clean rainwater is naturally slightly acidic because carbon dioxide in the air dissolves in it to form carbonic acid.

Identify the strong acid formed when sulfur trioxide (SO3\text{SO}_3SO3​) reacts with rainwater.

[1]
e.

Identify another pollutant gas, typically formed in car engines, that contributes to the formation of acid rain.

[1]
f.

State two problems caused by acid rain.

[2]

Gases in the atmosphere Questions

  1. IGCSE
  2. /Chemistry
  3. /Gases in the atmosphere