CAIE IGCSE Biology 5.1.1 Definition of a Catalyst

Practise stating both required parts of the catalyst definition: it increases reaction rate yet remains chemically unchanged and is not used up by the reaction.

Exam points

define a catalyst as a substance that increases the rate of a chemical reaction
state that a catalyst is not chemically changed or used up by the reaction it catalyses
recognise that enzyme and products remain after substrate has been converted in an enzyme-controlled reaction

[Maximum number: 2]

Enzymes are biological catalysts.

Describe what is meant by the term catalyst.

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5.1.1—Catalyst as a substance that increases question 1