C9 Chemistry of the atmosphere

What is the approximate proportion of nitrogen in Earth's current atmopshere?

• 80%

• 20%

• 10%

• 1%

What is the approximate proportion of oxygen in Earth's current atmopshere?

• 80%

• 20%

• 10%

• 1%

There are small proportions of water vapour, noble gases and which other gas in Earth's current atmosphere?

• carbon dioxide

• methane

• hydrogen

• ammonia

When Earth was formed it's atmosphere was similar to which planets?

• Venus and Mars

• Mercury and Venus

• Mars and Mercury

• Jupiter and Saturn

Earth's early atmosphere was similar to Venus and Mars, what do their atmosphere's consist of?

• Carbon dioxide with little or no oxygen

• Carbon dioxide and oxygen

• Nitrogen and oxygen

• Nitrogen, oxygen and a little of carbon dioxide

What produced the gases present in Earth's early atmosphere?

• Volcanoes

• Animals

• Forest fires

• Lightning reactions

Which gases were present in Earth's early atmosphere?

• Carbon dioxide with little or no oxygen

• Carbon dioxide, water vapour and nitrogen with small amounts of methane and ammonia

• Nitrogen and oxygen

• Nitrogen, oxygen and a little of carbon dioxide

Why have theories about Earth's early atmosphere developed and changed over time?

• Evidence is limited

• Scientists cannot agree

• Too much evidence

• Technology is too advanced

By what process do algae and plants produce oxygen?

• photsynthesis

• respiration

• combustion

• decomposition

Write the word equation to represent photosynthesis

• carbon dioxide + water → oxygen + glucose

• oxygen + glucose → carbon dioxide + water

• carbon dioxide + oxygen → glucose + water

• glucose + carbon dioxide → oxygen + water