Experiments
Here are experiments our science specialists have selected to support this IB* topic.
Additivity of Heats of Reaction: Hess's Law
Experiment #18 from Chemistry with Vernier
In this experiment, you will
- Combine equations for two reactions to obtain the equation for a third reaction.
- Use a calorimeter to measure the temperature change in each of three reactions.
- Calculate the heat of reaction, ΔH, for the three reactions.
- Use the results to confirm Hess’s law.
- Educational Standard
- International Baccalaureate (IB) 2025
- Subject
- Chemistry
- Organizing concepts
- Reactivity 1. What drives chemical reactions?
- Subtopics
- Reactivity 1.2—Energy cycles in reactions
- Level
- Additional 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.