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Comparing the Density of an Object to the Density of Water
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Learners compare the weight of equal volumes of wax, water, and clay. Learners discover that since the wax weighs less than an equal volume of water, it is less dense than water and will float.
Defining Density
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In this introductory demonstration and activity, learners are introduced to the concept of density as they explore a rock and a wooden block in water.
Comparing the Density of Different Liquids
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Learners carefully pour vegetable oil, water, and corn syrup in any order into a cup and discover that regardless of the order they are poured, the liquids arrange themselves in layers the same way.
Molecules in Motion
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In this activity, learners add food coloring to hot and cold water to see whether heating or cooling affects the speed of water molecules.
Curious Crystals
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Learners carefully look at four known household crystals.
Solubility Test
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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.
Crushing Test
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In this activity, learners design a crushing test and discover that identifying and controlling the variables may be difficult.
M&M's in Different Sugar Solutions
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In this activity, learners investigate whether having sugar already dissolved in water affects the speed of dissolving and the movement of sugar and color through the water.
The Ups and Downs of Thermometers
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In this activity, learners examine the parts of a thermometer. After placing a thermometer in hot and cold water, learners look at molecular model animations of the liquid in a thermometer.
Changing the Density of a Liquid: Heating and Cooling
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Learners investigate how the temperature of water affects its density.
Changing the Density of an Object: Adding Material
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Learners see that a can of regular cola sinks while a can of diet cola floats. As a demonstration, bubble wrap is taped to the can of regular cola to make it float.
Change in Temperature: Exothermic Reaction
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Learners add calcium chloride to a baking soda solution and observe an increase in temperature along with the production of a gas and a white precipitate. These are all signs of a chemical reaction.
Production of a Gas: Controlling a Chemical Reaction
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Learners mix vinegar and baking soda to produce a gas. With the addition of a bit of liquid soap, the gas becomes trapped in measurable bubbles.