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Combustion
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In this chemistry activity, learners discover that the weight of the product of combustion is greater than that of the starting material.
Balancing Act
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In this physics activity (page 6 of the PDF), learners will build a class 1 lever and hypothesize and test the distances two objects need to be placed from the fulcrum in order to balance.
Spring Scale Engineering
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In this activity, learners explore how spring scales work and how they are used for non-exact weight measurement.
As Light as Air
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Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.