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5.1 Measuring energy changes


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


Determining the Enthalpy of a Chemical Reaction

Experiment #13 from Advanced Chemistry with Vernier

In this experiment, you will

  • Use Hess’s law to determine the enthalpy change of the reaction between aqueous ammonia and aqueous hydrochloric acid.
  • Compare your calculated enthalpy change with the experimental results.


Investigating Commercial Hand Warmers

Experiment #12 from Vernier Chemistry Investigations for Use with AP* Chemistry

In the Initial Investigation, you will use a Temperature Probe to determine the temperature change of two substances as they dissolve in water. After completing the Initial Investigation, you will test several substances to determine which one can make the best hand warmer based on two factors: enthalpy of solution and cost.


An Investigation of Urea-Containing Cold Packs

Experiment #3 from Investigating Chemistry through Inquiry

In the Preliminary Activity, you will gain experience using a Temperature Probe as you determine the temperature change as a sample of urea dissolves in water.

After completing the Preliminary Activity, you will first use reference sources to find out more about cold packs, urea, and heat before you choose and investigate a researchable question dealing with urea or urea-containing cold packs.

Educational Standard
International Baccalaureate (IB)
5. Energetics/Thermochemistry

* 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.