Mixing Water Energy activities

Mixing without mixing

Question: How is energy transferred when warm and cold water mix?

Procedure: Record the temperature of the hot water and the cold water. Take 100 ml of each and put them in a styrofoam cup, mix with a thermometer and record the results.

Results: Temperature before after

Record the class results below:

 Team Cold Temperature Hot Temperature Mixed Temperature 1 2 3 4 5 6 Class Mean

Conclusion: Explain what caused the results.

Predict what the temperature would be if you mixed equal volumes of the following temperatures?

 100 50 200 100 50 88 0 5

Mixing water without mixing

Question: Will the temperatures of two liquids change if they aren’t directly touching?

Procedure: Take a styrofoam cup and a plastic cup. Place 100 ml of hot water into the plastic cup and 100 ml of cold water into the styrofoam cup. Then place the plastic cup into the styrofoam cup and record the temperature every minute.

Results:

 Time Hot Cup Cold Cup Start 1 min. 2 min. 3 min. 4 min. 5 min. 6 min. 7 min. 8 min. 9 min. 10 min.

Conclusions:

What further questions can you discovery? How does the amount of energy given off by a source and the amount of energy received by the energy receiver compare? How would the energy transfer and temperature change be different if the plastic container were made from a thick or thinner material? How would the energy transfer and temperature change have been different if there would have been more warm water than cold water? What would an energy chain look like? How could a rectangle or square be used as a model to explain the amount of energy in a substance?

For more information see Science Curriculum Improvement Study (SCIS, SCIIS, SCIS 3)