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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.

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.

In this activity, learners explore how spring scales work and how they are used for non-exact weight measurement.

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.

In this activity, learners balance chemical equations and discover the law of conservation of mass. Learners use coins to model molecules to balance the equations.

In this activity, learners design, build, test and redesign a display tower that will meet a specific set of criteria and constraints.