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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: $Zn$ $+$ $2H^+$ $\longrightarrow$ $Zn^{2+}$ $+$ $H_2(g)$