Heat+and+Temperature

 Heat and Temperature WebQuest 

Part I: Look at what the [|heating curve of water looks]   like. Pay attention to the explanations.

1. Which portions of the heating curve (if any) represent an adiabatic process? Justify your answer.

2. Which portions of the heating curve (if any) represent an isothermal process? Justify your answer.

3. Is the specific heat of ice the same as the specific heat of water?

Now look at this heating curve diagram to answer questions 4-6:    4. Identify the melting/freezing portion of the heating curve. Just by looking at this portion of the curve, can you figure out the heat of fusion of this substance?

5. Identify the boiling/condensing portion of the heating curve. Just by looking at this portion of the curve, can you figure out the heat of vaporizaiton of this substance?

6. Identify the liquid portion of the heating curve. Just by looking at this portion of the curve, can you figure out the specific heat of this substance. (This one is kind of tricky! Think of the equation that you would use for this process, and try to fill in the missing information.)

Part II: Watch the animation of the [|Steam Engine] .

1. What happens to steam as it pushes the piston? Why?

2. Which steps (if any) in this steam engine process can be considered adiabatic? Justify your answer.

3. Which steps (if any) in this steam engine process can be considered isothermal? Justify your answer.   Part III: Watch the [|compression and expansion animation]  1. What happens to the temperature of a gas as it is compressed? Why?

2. What happens to the temperature of a gas as it expands? Why?

3. Do you think this process is adiabatic, isothermal, or neither? Explain your reasoning.

<span style="FONT-SIZE: 170%; COLOR: #c96e3b; FONT-FAMILY: Verdana, Geneva, sans-serif">Part IV: <span style="FONT-SIZE: 170%; COLOR: #c96e3b; FONT-FAMILY: Verdana, Geneva, sans-serif">[|Compression]    <span style="FONT-SIZE: 120%; FONT-FAMILY: 'Arial Black', Gadget, sans-serif"><span style="FONT-SIZE: 170%; COLOR: #c96e3b; FONT-FAMILY: Verdana, Geneva, sans-serif">   : it gets SO hot that it catches on fire! In this video, a small amount of combustible material is inside of a sealed tube. A piston then suddenly compresses the air inside of the tube, and the material catches on fire! 1. Explain what causes the material to catch on fire.

2. Would you consider this process isothermal, adiabatic, or neither? Justify your answer.

<span style="FONT-SIZE: 150%; COLOR: #ca5e2f; FONT-FAMILY: Verdana, Geneva, sans-serif">Part V: Try the [|Second Law Demonstration] 1. If all of the letters from the sentence were put into a bag, shaken up, and dumped out, which result would you most likely see? How does this relate to entropy?

2. According to the second law of thermodynamics, processes will only occur naturally if the overall entropy increases. Does this mean that it is impossible to put the letters back in order? Explain your answer.

Part VI: Watch [|one more demonstration involving entropy]

1. Does this process seems to violate the second law of thermodynamics. Try to explain how it is NOT actually violated.