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A1.1.1—Water as the medium for life


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

Physical Properties of Water

Experiment #1 from Investigating Chemistry through Inquiry

In the Preliminary Activity, you will gain experience using a Temperature Probe and data-collection software—experience that will be helpful later as you investigate a physical property of water. You will measure temperature continuously before, during, and after warming a Temperature Probe in your hand. You will then gain experience selecting data ranges, determining statistics, and determining linear fits of selected data using data-collection software.

After completing the Preliminary Activity, you will first use reference sources to learn more about physical properties of substances and the physical properties of water in particular before you choose and investigate a researchable question dealing with a physical property of water.

Freezing and Melting of Water

Experiment #2 from Chemistry with Vernier

In this experiment, you will

  • Collect temperature data during the freezing and melting of water.
  • Analyze graphs to determine the freezing and melting temperatures of water.
  • Determine the relationship between the freezing and melting temperatures of water.

Educational Standard
International Baccalaureate (IB) 2025
A Unity and Diversity
Level of organization
1 Molecules
A1.1 Water
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.