Convert a) heat of vaporization b) heat of fusion c) heat of sublimation of water in cal/mol.
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Convert a) heat of vaporization b) heat of fusion c) heat of sublimation of water in cal/mol.
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- 23) A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg. K. A) 2.7 K B) 7.7 K C) 3.6 K D) 1.8 K E) 8.1 K10.) Specific heat capacity is related to the amount of internal energy a. Needed to change the temperature of one gram of a substance by one degrees C. b. Transferred by one molecule. c. Transferred by one object d. A specific object has.16) The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If Lp is the latent heat of fusion of this substance and Ly is its latent heat of vaporization, what is the value of the ratio Ly/LF? Temp. Time B) 4.5 C) 3.5 D) 1.5 E) 5.0 A) 7.2
- When two objects are in thermal equilibrium with a third object, then: A.They are in contact with each other. B.They are in thermal equilibrium with each other. C.They are at odds with one another. D.They must be transferring heat between each other.9) The nutritional information on a cereal box shows that one serving of a dry cereal has 200 kilocalories. If one were to burn one serving of the cereal, the amount of heat given off would be sufficient to raise the temperature of 20 kg of water how many degrees Celsius? A) 0.2°C B) 1.0°C C) 2.0°C D) 10.0°C E) 20.0°C Answer: D Topic: Concept 3.2 Skill: Application/AnalysisSpecific heat capacity is the quantity of heat... a. given off by a 1-kg substance that changes state from solid to liquid b. required to raise the temperature of 1 kg of a substance from 1ºC to 100ºC c. required to change 1 kg of a substance from a liquid to a gas d. required to raise the temperature of 1 kg of a substance 1ºC e. needed to melt 1 kg of a substance without a change in temperature
- 26) A 45.0-kg sample of ice is at 0.00° C. How much heat is needed to melt it? For water LF = 334,000 J/kg and Ly=2.256 x 106 J/kg. A) 0.00 kJ B) 1.02 x 105 kJ C) 1.50 × 104 kJ D) 4.10 x 106 kJ2) By what primary heat transfer mechanism does the sun warm the earth? A) conduction B) convection C) radiation D) All of the above processes are equally important in combination.