ch8 Rates of Reaction for IGCSE chemistry

igcse ch8

1. Rates of Reaction Samiksha Kumar and Neelayadakshi

2. Rate of Reaction = Amount of products formed per unit Time Speed of Reaction = Amounts of reactants used up per unit time

3. Factors affecting Rates of Reaction 1. Concentration 2. Pressure 3. Temperature 4. Surface Area 5. Catalyst

4. 1. Concentration The higher the Concentration: The number of reactant particles per unit volume increases. The number of collisions therefore increases. This leads to an increase in the Rate of Reaction.

5. 2. Pressure Only applicable for gases. When there’s an increase in Pressure: Particles come closer together. The number of successful collisions increase. Hence, the rate of reaction increases.

6. 3. Temperature The higher the Temperature: Particles move faster. Particles attain a higher kinetic energy and activation energy. This leads to an increase in the number of Collisions. Therefore, the Rate of Reaction increases.

7. 4. Surface Area So, when a lump is distorted into powder and their surface areas are compared, you’ll come to realize the powder has a larger surface area. -More particles are exposed to the surface. -An increase in the number of particles leads to more frequent collisions. Therefore, the rate of reaction increases.