Energy Transfer of Two Energy Transfer of Two Liquids! Liquids!

By: Briana Brogan, Lindsey By: Briana Brogan, Lindsey Tennis, Kristina Balla, Tennis, Kristina Balla,

Cheyenne Kressley, and Brit Cheyenne Kressley, and Brit RostRost

Purpose

To determine how energy is transferred between two liquids, that are at two different temperatures.

MaterialsMaterials

• water, temperature sensor, beakers, graduated cylinder, anything in the lab drawers, and alcohol.

HypothesisHypothesis

The temperature of the cold water The temperature of the cold water will rise and the temperature of the will rise and the temperature of the warm water will drop.warm water will drop.

IV (temperature Co)

Hot-50

Cold-19.8

Hot-60

Cold- 19.8

Hot- 70

Cold- 19.8

Hot- 80

Cold- 10

Hot- 90

Cold- 0

Trial 1 Trial 1 Trial1 Trial 1 Trial 1

DVDV

The temperature mixed water (CThe temperature mixed water (Coo))

Control and ConstantsControl and Constants

Control- room temperature, 19.8Control- room temperature, 19.8oo

Constants- same equipment and the same Constants- same equipment and the same amount of water.amount of water.

ProceduresProcedures

1. Heat the water to the specified degrees 1. Heat the water to the specified degrees CCo o (100mL of water).(100mL of water).

2. When you are finished pick up the 2. When you are finished pick up the beaker with beaker tongs.beaker with beaker tongs.

3. Cool the other beaker of water to 3. Cool the other beaker of water to specified degrees Cspecified degrees Coo (100mL of water) (100mL of water)

4. Mix and check the temperature.4. Mix and check the temperature.5. Repeat steps 1-4 until you have finished 5. Repeat steps 1-4 until you have finished

all the degrees Call the degrees Co.o.

ResultsResultsHot Hot Water Water Celsius Celsius

Cold Cold Water Water CelsiusCelsius

Water Water MixedMixed

CelsiusCelsius

5050 19.819.8 35.735.7

6060 19.819.8 38.638.6

7070 19.819.8 42.042.0

8080 1010 37.737.7

9090 00 40.740.7

Conclusion

We heated water to 50, 60, 70 ,80, and 90oC. Then we cooled water to 19.8, 10, and 0oC. The control was 19.8 C (room temperature). Next, we mixed the hot and cold water and checked the temperature.

Our hypothesis was that the temperature of the colder liquid will rise and the temperature of the warmer liquid water will drop. Our hypothesis was supported. We thought about what the average temperatures for our experiment would be and they were, 50oC and 19.8oC = about 34.9oC, 60oC and 19.8oC=39.9oC, 70oC and 19.8oC= 44.9oC, 80oC and 10oC= 45oC, and 90oC and 0oC= 45oC. When the hot water was at 50oC which was then was mixed with cold water at room temperature, it was 35.7oC. At 70oC and at room temperature, the mixed water was 42oC. When the water was 80oC and 10oC the mixed water was 37.7oC. Finally at 90oC and 0oC the mixed temperature was 40.7oC.

The EndThe End