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In this chemistry activity, learners prepare two petri dishes, one filled with water and one filled with milk.

Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

Using yeast, sugar, and water, learners create a chemical reaction which produces carbon dioxide (CO2) gas inside a 2-liter bottle. They use this gas to inflate a balloon.

Learners combine hydrogen peroxide with three different forms of potato: raw chunks, ground chunks, and boiled chunks.

In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.