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Horrific Specific Heat Problems

Horrific Specific Heat Problems. 1. How much heat is required to raise the temperature of a 55 g glass ball by 15 °C? (c = 0.837 J/ g °C). 2. 53 J of heat is added to a 108 g piece of aluminum at 25 °C. What is the final temperature of the aluminum? (c = 0.9 J/ g °C).

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Horrific Specific Heat Problems

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  1. Horrific Specific Heat Problems

  2. 1. How much heat is required to raise the temperature of a 55 g glass ball by 15 °C? (c = 0.837 J/ g °C)

  3. 2. 53 J of heat is added to a 108 g piece of aluminum at 25 °C. What is the final temperature of the aluminum? (c = 0.9 J/ g °C)

  4. 3. Gwynn’s bowl is filled with 0.175 kg of 60.0 °C soup (mostly water) that she stirs with a 20.0 °C silver spoon of mass 0.040 kg. The spoon slips out of her hand and slides into the soup. What equilibrium temperature will be reached if the spoon is allowed to remain in the soup and no heat is lost to the outside air? (cspoon = 240.0 J/kg °C). Assume no heat is transferred to the bowl itself.

  5. 4. A 50 g lead ball is dropped from rest from a height of 2 meters. Te collision between the ball and the ground is totally inelastic. Assuming all the ball’s kinetic energy goes into heating the ball, find its change in temperature. (c = 0.128 J/ g ° C)

  6. New Concept!!! • Heat of fusion (hf) is the amount of energy required to melt a solid. (hf for water = 335 J/ g). • Q = m hf • 5. How much heat is required to melt a 30 g ice cube?

  7. 6. To cool her 200 g cup of 75 °C hot chocolate (mostly water), Heidi drops a 30 g ice cube at 0 °C into her insulated foam cup. What is the temperature of the hot chocolate after all the ice is melted?

  8. Another New Concept!!! • Heat of vaporization (hv) is the amount of heat required to boil a liquid and convert it into gas. • hv for water = 2260 J/g. That’s a lot of energy! • Q = m hv 7. If you want to boil 0.2 kg of water, how much heat do you need to add?

  9. 8. How much heat is required to turn 0.2 kg of ice at 0 °C entirely into steam at 100 °C ? • 9. How much heat is required to change 20 kg of ice at -20 °C to steam at 115 °C? (c for ice = 2.09 J/g °C, c for steam = 2.01 J/g °C).

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