Edexcel Core Chemistry
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How did oceans form?
Water vapour cooled and condensed
What produced the gases in the Earths early atmosphere?
What is the percentage of nitrogen in today's atmosphere?
How did levels of carbon dioxide decrease?
- Dissolved in water
- Through photosynthesis
What is the percentage of oxygen in today's atmosphere?
Which gas did the early atmosphere contain a large amount of?
How did the growth of plants affect gases in the Earth's early atmosphere?
They decreased levels of carbon dioxide and increased levels of oxygen through photosynthesis
What type of gas is carbon dioxide and which pollution problem does it create?
A greenhouse gas which causes global warming
What environmental impact does global warming have?
It causes polar ice caps to melt
What is causing carbon dioxide levels to increase in today's atmosphere?
- Volcanic activity
- Burning fossil fuels
Why does deforestation cause levels of carbon dioxide to increase?
Less trees to carry out photosynthesis therefore less carbon dioxide is absorbed
What is the word equation for copper reacting with oxygen?
Copper + Oxygen --> Copper oxide
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