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The air around us contains a mixture of gases with the most common gas of the air being NITROGEN. This gas has a percentage in the air of 78%.
The next most common gas is the one that we use to keep up alive and it has only 21% of the total air. This gas is called OXYGEN.
The remaining 1% is made up of the following gases, carbon dioxide is 0.03%, argon is 0.9% and tiny percentages of gases including hydrogen, methane and several others make up the remaining small %.
Gas tests
Gas tests
As chemists we need to be able to identify samples of gases. We can do this by carrying out techniques called GAS TESTS. These tests and their results are listed below.
Oxygen - Relights a glowing splint
Hydrogen - Burns with a squeaky pop
Carbon dioxide - turns limewater from clear to cloudy
These gas tests are demonstrated in the video below.
The gases of the air are very important to all living things, including all plants and animals. It is important that the correct balance of gases is maintained for the survival of all biological species on our planet.
One such process is called the CARBON CYCLE. This will be the final section of this topic.
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