Chemistry of the Atmosphere AQA GCSE

For the last ............. .......... ........... the proportion of gases in the atmosphere has been much the same

• 200 million years

• 800 million years

• 1 billion years

• 200 billion years

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The current proportion of gases is approximately

• 20% nitrogen, 80% oxygen and small proportions of various other gases.

• 80% nitrogen, 20% oxygen and small proportions of various other gases.

• 70% nitrogen, 30% oxygen and small proportions of various other gases.

• 30% nitrogen, 70% oxygen and small proportions of various other gases.

What was the composition of Earth's early atmosphere?

• Mostly methane, little to no carbon dioxide

• Mostly oxygen, little to no carbon dioxide

• Mostly nitrogen, some oxygen

• Mostly carbon dioxide, little to no oxygen

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True or false. Volcanoes produced carbon dioxide, water vapour, methane and ammonia.

• True

• False

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Why does ozone depletion reach its maximum in September and October (and sometimes November and December)?

• Cold temperatures plus sunlight allow chlorine gas to be split into chlorine atoms and react with ozone

• Cold temperatures and the lack of sunlight in these months stops chlorine from reacting with itself, allowing it to attack ozone instead

• Human CFC use reaches its peak in these months

• False: ozone depletion reaches its maximum in June

Which is true about ozone formation and destruction? select all that apply

• Its formation and destruction is an example of a dynamic process in nature.

• It forms when a free oxygen atom reacts with a molecule of oxygen.

• UV radiation breaks up ozone by splitting off an oxygen atom.

• Ozone cannot reform once it absorbs UV radiation.

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The second step of ozone formation involves monatomic oxygen combining with what molecule?

• CO2

• O2

• NO2

• 2H2O

The second step of ozone formation involves atomic oxygen combining with what molecule?

• CO2

• O2

• NO2

• 2H2O

Considered harmful in the troposphere but beneficial in the stratosphere

• Sulfur dioxide

• Lead

• Ozone

• Hydrocarbons

• Particulates

The product is tropospheric ozone

• VOCS

• Secondary Pollutants

• Stratosphere

• Photochemical Smog