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Factors influencing the rate of reaction

The concentrations of the reagents

If the concentration of the reagents is high, the molecules are near to oneanother and they have more chance to meet:

Reaction rate increases with the concentration of reagents.

The temperature

If the molecules are agitated they have more chance to meet:

Reaction rate increases with temperature.

Quite often the rate doubles as the temperature increases by $10^oC$.

A catalyst

The catalyst for a reaction is a species which accelerates (or decelerates ) the reaction without participating as a reagent or a product.

$CuSO_4$ is a catalyst for the reaction: $Zn$ $+$ $2H^+$ $\longrightarrow$ $Zn^{2+}$ $+$ $H_2(g)$