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Chemistry (AQA Foundation)
Atmosphere and changing climate
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Which of the following statements about complete combustion of hydrocarbon fuels is correct?
Complete combustion occurs when a fuel burns in a limited supply of oxygen.
Complete combustion occurs when a fuel burns in a plentiful supply of oxygen. ✓
The products are carbon dioxide and water. ✓
The products are carbon monoxide and water.
Why is carbon dioxide considered an atmospheric pollutant?
it is an odourless, colourless toxic gas
it causes global dimming
it contributes to global warming ✓
Match the greenhouse gas to the correct molecular formula.
methane
⇔
CH₄ ✓
carbon dioxide
⇔
CO₂ ✓
water vapour
⇔
H₂O ✓
What is the equation for photosynthesis?
carbon dioxide + water → glucose + oxygen ✓
glucose + oxygen → carbon dioxide + water
methane + oxygen → carbon dioxide + water
What impact may deforestation have on the levels of carbon dioxide in the atmosphere?
the levels of carbon dioxide in the atmosphere will increase ✓
the levels of carbon dioxide in the atmosphere will remain the same
the levels of carbon dioxide in the atmosphere decrease
What key term is used to describe the number of waves that pass a point per second?
'frequency' ✓
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