Welcome to the module on Gases.

Things to note!
1. The characteristic tests for oxygen, carbon dioxide and hydrogen gases. 
2. The properties of carbon dioxide. 
3. Combustion and the Fire Triangle. 
4. Combustion, respiration, photosynthesis as chemical reactions. 
5. The atmosphere is a mixture of gases in a number of layers. 
6. Law of Conservation of Mass through the production and identification of a gas. 
7. The role of carbon dioxide in photosynthesis and extinguishing fire.