Transfer of Energy Through Water By: Sarah S Jessika F Nick L Halle B

Purpose Our purpose was to find out how energy is transferred between two liquids.

Hypothesis The hypothesis was that when you mix two liquids of the same volume the temperature will be the average temperature of the two.

Approximate Predictions Volume of hot water (mL) Temperature Predictions (C)

Materials The materials for this experiment were: Water Alcohol burner Temperature sensor Beakers Graduated cylinder

Constants The constants are the temperature of the first beaker, temperature of the second beaker, same liquid, same volume of room temperature water. (50mL)

Variables The independent variable is the volume of hot water. (mL) The dependent variable is the temperature of the mixed water. (C) Amount of Hot Water (mL) Trials: 201 trial 301 trial 401 trial 501 trial 601 trial 701 trial 801 trial

Procedure 1.Fill a beaker with 50mL of room temperature water (beaker 1) 2.Use an alcohol burner to heat 20mL of water to 80 degrees C in a test tube. 3.Pour the heated water into beaker 1. 4.Record the temperature. 5.Repeat with (30,40,50,60,70,80 mL of water)

Results Volume of Hot water (mL) Temperature of mixed water (C)

Results continued

Conclusion The data shows that when we mixed the two liquids the temperature of the water is a little less than the average of the two. The starting temperature of the hot water was 80 degrees and we changed the volume of this and mixed it with 50 mL of room temperature water. Our control was 50 mL of room temperature water and 50 mL of 80 degree water. The mixed water was 52.2 degrees. The temperature of the mixed water was slightly below the average which was 56.6 degrees. Our hypothesis was disproved by the data. The hypothesis stated that the temperature of the mixed water would be the average of the hot water and room temperature water. The temperature was slightly below average. Also, as the amount of hot water increased, so did the temperature of the mixed water, but not enough to meet the average. The temperature of the mixed water was slightly below average, partially due to the fact that when we mixed the water, heat was lost to the surrounding area. The temperature increased when we added more hot water to the room temperature water, because the amount of thermal energy was higher. The predictions were very close to the actual results.