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Heat and Heat Transfer

Investigation 1 – PostLab

 

 

 

 

 

 

 

ANALYZE IT

Complete the Analysis Questions in your SDR then be prepared to discuss them as a class. 

  • Before the glass tube was placed in the boiling water, which had greater kinetic energy the boiling water or the liquid in the glass tube? 
  • What happened to the level of the liquid in the sealed glass tube when it was placed in boiling water?
  • Before the glass tube was placed in the saltwater ice bath, which had greater kinetic energy, the liquid in the glass tube or the water and ice in the saltwater bath? 
  • What happened to the level of the liquid in the sealed glass tube when it was placed in the saltwater ice bath? 

  • Describe the direction of heat transfer between the boiling water and the liquid in the glass tube in Trial 1. 

  • Describe the direction of heat transfer between the saltwater ice bath and the liquid in the glass tube in Trial 2. 

As a class, discuss the concepts you have learned thus far. Answer the Conclusion question.

  • Explain why the level of the liquid in the glass tube changed when it was placed in the boiling water and in the saltwater ice bath. Use the terms heat transfer and kinetic energy in your answer. 
  • Did you observe any phase changes during Trials 1 and 2? Explain your answer. 
  • Which scale did you use when creating your thermometer? The Celsius scale.
  • Was there a difference between the temperature as measured by the “Lab-created thermometer” and the “Reference thermometer?” 
  • How would you describe the accuracy of the thermometer that you created? 

  • Why may there be differences in the accuracy between the “Lab-created thermometer” and the “Reference thermometer?” 

Discuss questions that follow Trial 4.

  • Recall Trials 1 and 2. What is the relationship between the kinetic energy of the molecules of liquid inside the “Lab-created thermometer” and the height of the liquid in the thermometer? 
  • What type of physical changes in matter occurs when the kinetic energy of molecules changes? 
  • How did the “Lab created and Reference thermometers” measure changes in the kinetic energy of molecules? 

HEAT1 TableA

  • Look at Table A (above). How did the kinetic energy of the molecules of liquid inside the “Lab created” and “Reference” thermometers change when placed in the three different temperatures of water? 
  • Look at Table A (above). Describe the direction of heat transfer between either of the thermometers and the beaker filled with three different temperatures of water. 

APPLY IT

In Trials 1-4, you observed physical changes in liquids that occurred with the transfer of heat and changes in the kinetic energy of molecules. One of the changes you observed was the expansion of the liquid inside the thermometer as it was heated and the contraction of the liquid inside the thermometer as it was cooled. Look at the pictures below and answer the questions that follow.

HEAT1 Post1

  • What happened to the kinetic energy of the air molecules as the flask was heated? 
  • Why did the balloon inflate when the flask was heated and deflate when the flask cooled? Use the terms kinetic energy, expansion, and contraction in your answer. 

In Trials 1-4, you observed physical changes in liquids that occurred with the transfer of heat and changes in the kinetic energy of molecules. One of the changes you observed was the expansion of the liquid inside the thermometer as it was heated and the contraction of the liquid inside the thermometer as it was cooled. Look at the pictures below and answer the questions that follow.

HEAT1 Post2

  • What happened to the kinetic energy of the molecules in the metal ring when the ring was placed in the flame? 
  • What happened to the kinetic energy of the molecules in the metal ball when it was placed in the ice bath?

  • Why could the ring fit over the ball when either the ring was placed in the flame or the ball was placed in the ice bath? Use the terms kinetic energy, expansion, and contraction in your answer. 
  • What conclusions can you make about heat and expansion and contraction of most solids, liquids, and gases? 
  • Do you think there may be exceptions to the conclusion you described? 
  • What type of energy changes occurs when matter changes state or phases? 

GET FOCUSED

Complete the Focus Questions in your SDR then discuss them as a class. 

  • What is the relationship between heat, kinetic energy, and temperature? 
  • What changes in matter accompany changes in the heat?