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Investigate Enzymes as Catalysts

In this worksheet, students will investigate enzymes as a type of catalyst.

'Investigate Enzymes as Catalysts' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Chemistry: Chemical Reactions

Curriculum subtopic:   Catalysts

Difficulty level:  

Worksheet Overview

Catalysts are substances that speed up chemical reactions.


When you think of chemical reactions, you probably imagine something spectacular that takes place in a science lab? Well, chemical reactions can be like this, but chemical reactions can also go on inside the body, unseen by anyone. 


The catalysts that speed up reactions in the body are called enzymes. Enzymes are biological catalysts, as they are important in biological reactions such as digestion. 


digestive system


Digestion would take place without enzymes, but much slower. In the presence of various enzymes it is a much speedier process.


The three main enzymes in digestion are:






Lipase speeds up the breakdown of fats in our food.

The word equation is shown below:

Fat → Fatty acids + glycerol


Protease speeds up the breakdown of protein into amino acids.

Carbohydrase speeds up the breakdown of carbohydrates into sugars. 


Now each of these three enzymes is slightly different to the others, so they only work on their own reactions. Lipase for example, will not speed up the breakdown of proteins. 


Are you ready to try some questions about enzymes?


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