# Natural Science - Year II

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Lab Assignment for Unit 46

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# Unit 46 Laboratory Activity: Measuring Heat

## Goal: To observe heat flow from one object to another.

### Materials

• Styrofoam or ceramic cups (better insulators than glass or metal) able to hold 2 cups of water each.
• Heat source (stove?) for boiling water; teakettle or pan
• Glass measuring cups which can stand boiling water temperatures
• Thermomenter

### Procedure

1. Measure one cup of tap water (room temperature) into one of your insulator cups.
2. Record the temperature of the water in the insulator cup.
3. Heat water in a pan on the stove or in the microwave until it is hot but not boiling.
4. Measure 1 cup of the hot water into your glass measuring cup.
1. Measure and immediately record the temperature of the hot water.
2. Add the hot water to your room temperature water in the insulating cup.
3. Immediately record the water temperature of the mixed water.
4. Record the temperature in the insulating cup every 15 seconds until it stops changing.
5. Repeat this experiment at least twice. You should use twice as much hot as cold water the second time, and twice as much cold water as hot water the third time.

### Report

Be sure to cover the standard topics: describe your equipment and procedure. Record your measurements in a table form (a suggested layout is shown below), and give at least one sample of your calculations.

 Trial 1 2 3 4 Cold water 1 cup 1/2 cup 1 cup Cold water temperature Hot water 1 cup 1 cup 1/2 cup Hot water temperature Water temperature, 0 secs Water temperature, 15 secs Water temperature, 30 secs Water temperature, 45 secs Water temperature, 60 secs Water temperature, 75 secs Final temperature change of cold water Final temperature change of hot water