Gases and water - revision quiz

Which gas is 78% of the air?

• Nitrogen

• Oxygen

• Argon

• Carbon dioxide

The % of carbon dioxide in the early Earth's atmosphere was ___________ than the % of carbon dioxide in the atmosphere today.

• much less than

• a bit less than

• a bit more than

• much more than

Which of the following is true about the experiment shown below?

• The volume of air left at the end is 21 cm3

• The volume of air left at the end is 79 cm3

• You should measure the volume on the gas syringes straight away after heating it

• The copper turns from orange --> black

Reorder the following: which happened first as the atmosphere developed?

• Plants evolved and released oxygen by photosynthesis

• Animals evolved and could use oxygen for respiration

• Water vapour condensed to form the oceans

• Volcanoes released ammonia, methane, water vapour and carbon dioxide

• Carbon dioxide was locked into rocks when shelled animals died and dissolved into oceans

When magnesium burns in oxygen, it makes magnesium _________.

The products when a hydrocarbon fuel burns in plenty of oxygen are:

• Water and carbon monoxide

• Water and carbon dioxide

• Ammonia and carbon dioxide

• Ammonia and water

The test for oxygen is to use a _________ splint, which then relights.

Which of these is the test for water?

• Litmus paper turns from white --> blue

• Anhydrous copper sulphate turns from white --> blue

• Litmus paper turns from blue --> white

• Anhydrous copper sulphate turns from blue --> white

If the formula of nitrogen dioxide is NO2, what does this tell you?

• There are two molecules of nitrogen and one molecule of oxygen

• There are two molecules of oxygen and one molecule of nitrogen

• Each molecule contains one oxygen atom and two nitrogen atoms

• Each molecule contains two oxygen atoms and one nitrogen atom

Who discovered oxygen, and how?

• Isaac Newton, by heating up copper, so it reacted with oxygen

• Albert Einstein, by heating up magnesium oxide, so it formed magnesium and oxygen

• Joseph Priestley, by heating up mercury oxide, so it formed mercury and oxygen

• Marie Curie, by heating up polonium so it reacted with oxygen