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Temperature and Heat Practice Questions

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Updated on Sep 27, 2011

Review these concepts at: Temperature and Heat Study Guide

Practice Questions

  1. A child has a viral infection and his body temperature is 101.5° F. Find the corresponding temperature in °C.
  2. For the information given in practice problem 1, find the corresponding Kelvin temperature.
  3. If the temperature-pressure drop was not linear, would scientists be able to determine the zero absolute by a linear extrapolation? Explain briefly.
  4. The outside temperature changes from morning to noon by about 20° F. Find the corresponding change in temperature in Celsius degrees.
  5. For the information given in practice problem 4, find the corresponding change in temperature in Kelvin. What do you observe about the two answers?
  6. Determine the relationship between Celsius scale and a made-up scale, call it FAKE, that considers 55 degrees the freezing point of water and 135 degrees the boiling point of water? Show the equation.
  1. Give examples of other quantities you learned about in previous lessons that represent quantities of state.
  2. Give examples of other quantities you learned about in previous lessons that represent quantities of process.
  3. An object is cooling off. Are particles slowing down or speeding up in this process? Explain briefly.
  4. If you raise an object from the floor, does the internal energy of the object increase, decrease, or stay the same? Explain briefly.
  1. A copper-based pot filled with water sits on a heating device. Explain the process of warming up the water.
  2. With the information given in practice problem 11, where is the water hotter? Why?
  1. Two objects of equal mass are exchanging heat with two heat reservoirs at the same rate. One object has a specific heat twice as large as the heat of the second object. How do the temperature variations for each object compare? Show your calculations.
  2. Water has a very large specific heat. Is it easy to change the temperature of a body of water: lake, sea, or ocean?
  3. What difference would it make in the calorimetric equation if the system is not isolated? Explain briefly.
  4. An iron rod receives an amount of heat of 2,380 J from a heat reservoir. The rod has a mass of 0.500 kg. Find the temperature change.
  5. With the information given in practice problem 16, find the initial and final temperatures if the final temperature is larger than the initial temperature.
  1. During the boiling process, what happens to the temperature of the liquid?
  2. Consider your answer to practice problem 18. Now, if you exchange more heat with the liquid, is that going to change its temperature?
  3. An object is placed in a steamy location, and condensation occurs on its surface. Does that change the temperature of the object? If yes, in what way?
  4. Ethyl alcohol has a latent heat of vaporization of 200 cal/g. Find out what quantity would be necessary to condense to create enough heat to bring to boil 200 g of water from 98°C.
  1. Consider two aluminum rods: Rod 1 has a length three times smaller than Rod 2 but the same size diameter. How do the rods change their length if they are subjected to the same change in temperature? Show your calculations.
  2. For the information given in practice problem 22, how does the change in volume for the two rods compare? Show your calculations.
  3. When is it easier to measure thermal expansion? When the object has a large initial length? A small initial length? Or it does not matter what the initial length is?
  4. A silver teaspoon is placed in a hot cup of tea. The room temperature is 24.0°C and the tea is at 82.0°C. Silver has a coefficient of thermal expansion of 1.90 ·10–5°C– 1. In the process of thermal expansion, the change in length is measured to be 165 μm. Find the initial and final lengths of the teaspoon.

Answers

  1. 61° C
  2. 311.8 K
  3. No, since the data cannot be fitted with a linear equation.
  4. 11° C
  5. 11 K; they are the same.
  6. Pressure, density, volume, etc.
  7. Work
  8. Slowing down since the object loses energy
  9. Stays the same since the interaction is similar
  10. Heat is transferred through both radiation and conduction to the pot and then transferred to the (bottom layer of) water through radiation and conduction through c on to the top layers.
  11. At the bottom closer to the heat source
  12. The large specific heat object heats up slower at half the rate.
  13. No, because the water will take a lot of heat to change its temperature slightly.
  14. Then energy is not conserved and you have to take losses to the surroundings into account.
  15. 10.6 Celsius or kelvin degrees
  16. ti = 6.1° C and tf = 16.7° C
  17. Stays the same
  18. No, all heat is used to change the state.
  19. It warms it up.
  20. 2 grams
  21. The longer one expands three times more than the shorter one.
  22. The longer one increases its volume nine times.
  23. It's easier for long objects.
  24. L0= 0.15 m and Lf = 0.15 m + 165 μm
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