Β 
VIEW IN FULL SCREEN

Edexcel GCSE Chemistry Catalysts

Catalysts

This page covers the following topics:

1. Catalysts
2. Applications of catalysts

A catalyst is a substance that lowers the activation energy of a reaction by providing an alternative pathway for reaction. The catalyst doesn't take part in the reaction so will not be altered or used up.

Catalysts

Catalysts are important to many industrial and biological reactions (inside plants or animals). Biological catalysts are given the name 'enzyme' and different enzymes are present in every cell of the human body to perform a number of vital reactions.

Applications of catalysts

1

Look at this graph showing enzyme activity at different temperatures. Why does the rate of reaction fall at higher temperatures and not continue to increase?

Look at this graph showing enzyme activity at different temperatures. Why does the rate of reaction fall at higher temperatures and not continue to increase?

2

What is the catalyst used in the Haber process? (the reaction between nitrogen and hydrogen to form ammonia)

What is the catalyst used in the Haber process? (the reaction between nitrogen and hydrogen to form ammonia)

3

How do catalysts affect rate of reaction using collision theory?

How do catalysts affect rate of reaction using collision theory?

4

Manganese oxide acts as a catalyst for the decomposition of hydrogen peroxide, what would be the effect of adding manganese oxide on the volume of oxygen produced in the first 10 seconds of this reaction?

Manganese oxide acts as a catalyst for the decomposition of hydrogen peroxide, what would be the effect of adding manganese oxide on the volume of oxygen produced in the first 10 seconds of this reaction?

5

Manganese oxide acts as a catalyst for the decomposition of hydrogen peroxide, what would be the effect of adding manganese oxide on the volume of oxygen produced by the end of this reaction (using the same amount of hydrogen peroxide)?

Manganese oxide acts as a catalyst for the decomposition of hydrogen peroxide, what would be the effect of adding manganese oxide on the volume of oxygen produced by the end of this reaction (using the same amount of hydrogen peroxide)?

End of page

Β