GCSE Chemistry Paper 2 Topics

How much Nitrogen in the Earth’s atmosphere: 80%

How much Oxygen in the Earth’s atmosphere: 20%

Two reason on why carbon dioxide has decreased in Earth’s atmosphere: Dissolving in oceans and Photosynthesis

What are the three main greenhouse gases: Nitrous oxide, Carbon dioxide and Methane

What is the name given to a mixture that has been designed as a useful product: Formulation

Hydrocarbon: Molecules made up of carbon and hydrogen atoms only

Catalysts: It speeds up a reaction without being used up

What are catalysts in biological systems called: Enzymes