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In this activity, learners heat and cool carbonated water to find out whether temperature has an effect on how fast the dissolved gas leaves carbonated water.

The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

Learners observe a sealed test tube containing a small amount of solid stearic acid.

Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

In this activity, learners investigate the process of osmosis by adding salt to a sealed bag of raw carrots and comparing it to a control.

In this demonstration, learners observe vinegar and baking soda reacting to form carbon dioxide (CO2) gas.

In this activity, learners apply a dissolving test to known crystals to identify the unknown. Since the unknown is chemically the same as one of the known crystals, it should dissolve similarly.

Learners observe and conduct experiments demonstrating the different properties of hot and cold materials.

In this activity, learners build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

Learners create a model of a wetland to observe how it absorbs and filters water from the environment.

In this experiment, learners try different liquids to see which ones clean pennies best. Liquids to try include water, lemon juice, cola, vinegar, and dishwashing detergent.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

Learners follow directions to construct a water-powered electrical generator using a turbine made from plastic spoons.

In this activity, learners explore and compare the buoyant properties of materials found in nature and in human-made materials.

This hands-on experiment will provide learners with an understanding of the issues that surround environmental cleanup.

Construct a simple battery that's able to power a small light or motor out of foil, salt water, and charcoal. A helpful video, produced by the Exploratorium, guides you along on this activity.

Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere.

In this simple activity (on page 2 of the PDF), learners make a crystal garden using salt, water, and a brick.

In this yummy chemistry activity which requires adult supervision, learners use sugar and water to explore how crystals form.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.