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122 Section Review
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27 Heat of Vaporization Old-fashioned heating systems sent steam into radiators in each room of a house In the radiators, the steam condensed back to water Analyze this process and explain how it heated a room 28 Heat of Vaporization How much heat is needed to change 500 g of water at 800 C to steam at 1100 C 29 Heat of Vaporization The specific heat of mercury is 140 J/kg C Its heat of vaporization is 306 105 J/kg How much energy is needed to heat 10 kg of mercury metal from 100 C to its boiling point and vaporize it completely The boiling point of mercury is 357 C 30 Mechanical Energy and Thermal Energy James Joule carefully measured the difference in temperature of water at the top and bottom of a waterfall Why did he expect a difference 31 Mechanical Energy and Thermal Energy A man uses a 320-kg hammer moving at 50 m/s to smash a 30-kg block of lead against a 450-kg rock When he measured the temperature he found that it had increased by 50 C Explain how this happened
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32 Mechanical Energy and Thermal Energy Water flows over a fall that is 1250 m high, as shown in Figure 12-17 If the potential energy of the water is all converted to thermal energy, calculate the temperature difference between the water at the top and the bottom of the fall
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33 Entropy Evaluate why heating a home with natural gas results in an increased amount of disorder 34 Critical Thinking A new deck of cards has all the suits (clubs, diamonds, hearts, and spades) in order, and the cards are ordered by number within the suits If you shuffle the cards many times, are you likely to return the cards to their original order Explain Of what physical law is this an example
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Section 122 Changes of State and the Laws of Thermodynamics
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When a beaker of water is set on a hot plate and the hot plate is turned on, heat is transferred It first is transferred to the beaker and then to the water at the bottom of the beaker by conduction The water then transfers heat from the bottom to the top by moving hot water to the top through convection Once the heat source is removed or shut off, the water radiates thermal energy until it reaches room temperature How quickly the water heats up is a function of the amount of heat added, the mass of the water, and the specific heat of water
QUESTION
How does the constant supply of thermal energy affect the temperature of water
Objectives
Measure, in SI, temperature and mass Make and use graphs to help describe the
Procedure
1 Set the hot plate to the highest setting, or as recommended by your teacher Allow a few minutes for the plate to heat up 2 Measure the mass of the empty beaker 3 Pour 150 mL of water into the beaker and measure the combined mass of the water and the beaker 4 Calculate and record the mass of the water in the beaker 5 Create a data and observations table 6 Record the initial temperature of the water and the air in the classroom Note that the bulb end of the thermometers must not touch the bottom or sides of the beaker, nor should it touch a table or your hands 7 Place the beaker on the hot plate and record the temperature every minute for 5 min 8 Carefully remove the beaker from the hot plate and record the temperature every minute for the next 10 min 9 At the end of 10 min, record the temperature of the air 10 Turn off the hot plate 11 When finished, allow the equipment to cool and dispose of the water as instructed by your teacher
change in temperature of water as it heats up and cools down Explain any similarities and differences in these two changes