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The best way to improve your exam technique is to do past papers under timed conditions. Be strict with yourself and treat it like an actual exam. Then mark your own paper using the official mark schem...

The equation for complete combustion is: 

hyrdocarbon + oxygen -> water + carbon dioxide 

A plentiful supply of oxygen is required in order to ensure complete combustion....

Graphite is a mineral whose molecular structure is made up of carbon atoms. 

A carbon atom can bind up to 4 other atoms around it (it has 4 electrons in its outer-most shell which it can ...

A salt is an ionic compound which is made up of two groups of oppositely charged ions.
The overall compound of a salt compound must have an overall electrical charge of 0.
Ammon...

In simple terms, we need to know whether a reactant is first, second or zero order if we want to understand what effect changing the concentration of that reactant has on the rate of the reaction.