3-COS-03
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Contents
Outcomes
- In order to form vapor, the molecules of the liquid must overcome the forces of attraction between them.
- The temperature of a boiling liquid remains constant, even when more heat is added.
Specification References
- 5.10 Understand that a substance can change state from liquid to gas by the process of evaporation or boiling.
Main Body of Lesson
- Pupils are given a range of water samples and are asked to determine which sample is ‘contaminated’
- Find the boiling point of water samples (one distilled water/ other will salt added)
Homework
- Plot graphs and discuss + identify contaminated water sample.
- Extension – Research -Why is the boiling point different?
Additional Information
Resources Required
- Bunsen burner kit, beakers, thermometers, samples of distilled and contaminated (salt) water
Textbook References
- Physics for you pg. 55-59
Website References
Skills Addressed
- Observations and Inferring
- Collecting data and plotting graphs
Safety/Hazards
- Hot water hazard, Use of Bunsen burners, goggles required
