ChangingFreezingPointwSalt

ChangingFreezingPointwSalt - Changing the Freezing Point of...

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Changing the Freezing Point of Water with Salt Shirley Hatcher Daniel Hale Williams School 2710 South Dearborn CHICAGO IL 60616 (773) 534-9226 Objective(s): 1. To teach first grade students that salt water freezes at a lower temperature than plain water 2. To determine the temperature at which water freezes 3. To understand why salt water freezes at a lower temperature than plain water 4. To understand why the string sticks to the ice cube when salt is placed on the cube 5. To compare student hypotheses with the actual results of the experiment Materials: Classroom graph, glass, string, water, ice cube, salt and thermometers Strategy: Each student will receive a cup with ice and a piece of string. Float the ice cube on water filled to near the top of the cup. Place the string across the ice cube, and then give each student a teaspoon of salt to pour on the ice cube and string. Each student will determine if the string freezes, sinks, does nothing or disappears.
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