Question

The rate of reaction of substance is proportional to their​

Answer 1

The rate of reaction is proportional to the number of collisions per unit time. If one concentration is doubled, the number of collisions will also double.

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Answer 2

• The rate of reaction is defined as the speed at which a chemical reaction takes place.
• The rate of reaction is directly  proportional to the number of collisions per unit time.  
• If one concentration is doubled, the number of collisions will also double.
• The properties that affect the rate of reactions are:

        Temperature.

        The presence of a catalyst.

         Light.

         The concentration of reactants.

         The physical state of reactants.

• The example for rate of reaction is wood combustion.
• The rate of reaction is denoted as $\frac{dZ}{dt}$.

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