Temperature

As temperature increase, the rate of a reaction increase.
In general, for ever 10^oC increase in temperature the rate of a reaction increase.
Temperature affects endothermic reactions more than exothermic reaction.

Concentration

As concentration increase, the rate of a reaction increase.

Surface Area

As surface area increase, the rate of a reaction increase.

Chemical Nature

Some compounds react more easily than other reactants.

Catalyst

Catalyst increases the rate of a reaction by providing an alternative reaction pathway.