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1 ALL MATTER IN THE UNIVERSE IS MADE OF VERY SMALL PARTICLES
- Theory
- TASKS
- 3.1 We observe and study substances
- 3.2 Water is not only for drinking
- 3.3 The air around us
- 3.4 Metals in our life
- 3.5 Light
- 3.6 Physical qualities (volume, force, time, weight)
- Task 1: Measure the volume of liquid, powdered and solid substances with a graduated cylinder made of a PET bottle
- Task 2: Measure the volume of the lungs by so-called spirometer made from a PET bottle
- Task 1: Make a scale from a ruler
- Task 1: Make a paper sundial
- Task 2: Make a paper sundial in the garden
- Task 1: Make a dynamometer for measuring the tension force
- Task 2: Make a dynamometer for measuring the press
- WORKSHEETS FOR PUPILS
- Workshops
Task 2: The Speed of Evaporation
Topic: properties of substances
Level: Primary (1.–5. Graders)
Thematic Unit:
Subject: science
Recommended age of pupils: 6–11 years old or older
Time allocated: preparation: 5 minutes, implementation: 5 minutes
For every working group, the teacher prepares three slides or any unabsorbent mat, three droppers, and from the previous experiment three bottles with liquids – water, acetone and ethanol.
Pupils estimate, based on their own experience and previous measurements, which drop will evaporate the fastest. In their working groups, pupils can discuss it and come to a common conclusion. Each of the pupils completes the worksheet with his/her estimate.
Working procedure: On the first slide or an unabsorbent mat, pupils place a drop of water with the first dropper, on the second a drop of acetone and on the third one a drop of ethanol. They write their findings in the attached table. Pupils can be encouraged to blow gently above the surface of the drops to speed up the evaporation.