Gases in the Atmosphere

Gases in the Atmosphere Quiz

Spec 2.9–14 · Edexcel IGCSE Chemistry: Quiz

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5 questions, one answer each

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  1. 1. What is the approximate percentage of nitrogen in dry air?

    • A. 21%
    • B. 78%
    • C. 1%
    • D. 0.04%

  2. 2. What forms when sulfur burns in oxygen?

    • A. Sulfur trioxide
    • B. Sulfuric acid
    • C. Sulfur dioxide
    • D. Hydrogen sulfide

  3. 3. A student burns excess phosphorus in a sealed volume of air over water and measures how far the water rises. What does this experiment determine?

    • A. The percentage of nitrogen in air
    • B. The percentage of carbon dioxide in air
    • C. The percentage of oxygen in air
    • D. The percentage of argon in air

  4. 4. Copper(II) carbonate is heated strongly until no further change occurs. What best describes what happens?

    • A. It melts without changing chemically
    • B. It thermally decomposes into copper(II) oxide and carbon dioxide
    • C. It reacts with oxygen to form copper(II) oxide
    • D. It sublimes directly to a gas

  5. 5. Why is increasing atmospheric carbon dioxide a concern for climate change?

    • A. It destroys the ozone layer
    • B. It absorbs and re-emits infrared radiation, trapping heat near Earth's surface
    • C. It reacts with nitrogen to form smog
    • D. It reduces the oxygen percentage in air significantly

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