This experiment is designed to teach first through third graders the ice melting properties of salt. Place ice cubes in four paper cups. Place one teaspoon of salt in the first cup, two in the second, three in the third and no salt in the fourth cup. Time how long it takes for each ice cube to melt and record your data.
Salt and sugar will alter the freezing point of water and they will both dissolve at different rates. In this experiment, you will need 8 ounces of water in two clear cups. Place 1/2 teaspoon of sugar in one cup and 1/2 teaspoon of salt in the other. Stir the content of each cup and note how long it takes for each substance to dissolve. Then place each cup in the freezer and note how long it takes for each solution to freeze. Take note of the results and this will indicate which substance freezes sooner. Ask students to draw conclusions about which substance will melt ice faster based on the data.
In this experiment, pour 6 ounces of tap water in four freezer-proof beakers. Add 1 teaspoon of salt to one beaker, 1 teaspoon of sugar to another beaker, 1 teaspoon of lemon juice to a third beaker and just plain water in a fourth beaker. Mark each beaker and then place them in the freezer without stirring. Check the freezer every 10 minutes to see which beaker freezes the fastest and which one takes the longest.
Determine how long it takes for salt and sugar solutions in various concentrations to melt ice. In this experiment, you will make four solutions. They are 1 percent salt water, 10 percent salt water, 1 percent sugar and 10 percent sugar. Pour 6 ounces of each solution over an ice cube and then time how long it takes for each cube to melt. Record your data. Ask students to draw conclusions about the concentration levels of the solution and their ability to melt ice.