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Reactivity 2.2.3—Factors that influence the rate of a reaction include pressure, concentration, surface area, temperature and the presence of a catalyst.


Here are experiments our science specialists have selected to support this IB* topic.

Enzyme Activity

Experiment #23 from Investigating Chemistry through Inquiry

In the Preliminary Activity, you will use catalase in yeast to catalytically decompose hydrogen peroxide. You will determine the rate of enzyme activity by measuring the pressure of oxygen gas produced as H2O2 is decomposed.

After completing the Preliminary Activity, you will first use reference sources to find out more about enzymes and enzyme activity before you choose and investigate a researchable question dealing with enzyme activity.

Educational Standard
International Baccalaureate (IB) 2025
Organizing concepts
Reactivity 2. How much, how fast and how far?
Reactivity 2.2—How fast? The rate of chemical change
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.