Chemistry C1

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Created by: zchen
Created on: 08-05-16 17:27

What is Air?

A mixture of gases

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Name the main gases in the air?

Nitrogen, Oxygen, Argon, Water vapour and Carbon dioxide

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Why aren't clouds and dust parts of the air?

Clouds are water or ice and dust is solid.

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What does dry air contain?

78% Nitrogen, 21% Oxygen and the remaining 1% is mainly Argon and very small amounts of other gases such as (about 0.04%) Carbon dioxide.

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What does oxygen react with most metals to make?

Solid metal oxides

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How can we find the percentage of oxygen in the air?

By passing air over heated copper

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When roughly was the Earth's atmosphere formed?

About 4 billion years ago

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How was the Earth's atmosphere formed?

By gases given out by volcanoes

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What do volcanoes release large amounts of?

Carbon dioxide and water vapour (along with lava and dust)

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Different processes have removed almost all of the carbon dioxide that was in the early atmosphere, leaving the air with the composition we have today. What happened to the carbon dioxide?

1) 4 billion years ago the Earth's atmosphere was very hot. 2) As the Earth cooled, the water vapour condensed and formed the oceans. 3) About 3 billion years ago, the evolution of photosynthesising organisms caused the production of oxygen and the r

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