# Phys222 W11 Quiz 1: Chapters Keys. Name:

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1 Name:. In order for two objects to have the same temperature, they must a. be in thermal equilibrium. <= b. be in thermal contact with each other. c. have the same relative hotness or coldness when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.. 2. A thermometer registers a change in temperature of 00 F. What change in temperature does this correspond to on the Kelvin Scale? a. 453 b. 328 c. 80 d. 55. <= e What is the change in area (in cm 2 ) of a 0.0 cm by 50 cm automobile windshield when the temperature changes from 0 C to 3.0 C. The coefficient of linear expansion of glass is 9 0 / C. a..2 b c d. 4.8 e <= 4. A container with a one-liter capacity at 27 C is filled with helium to a pressure of 2 2 atm. ( atm = N/m.) How many moles of helium does it hold? a b <= c d e..0

2 5. A 5-kg piece of lead (specific heat 0.03 cal/g C) having a temperature of 80 C is added to 500 g of water having a temperature of 20 C. What is the final equilibrium temperature (in C) of the system? a. 79 b. 2 c. 54 d. 34. <= e. 20. How much heat (in kcal) must be removed to make ice at 0 C from 2 kg of water at 20 C? (The specific heat of ice is 0.5 cal/g C, the latent heat of fusion of water is 333 kj/kg) a. 90 b. 200 c. 240 d. 20 <= e Five moles of an ideal gas expands isothermally at 00 C to five times its initial volume. Find the heat flow into the system. a J <= b J c J d J e J. 8. In which process will the internal energy of the system NOT change? a. An adiabatic expansion of an ideal gas. b. An isothermal compression of an ideal gas <= c. An isobaric expansion of an ideal gas. d. The freezing of a quantity of liquid at its melting point. e. The evaporation of a quantity of a liquid at its boiling point. 2

3 9. For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of a. conduction. b. convection. c. radiation. <= d. conduction and convection. e conduction and radiation. 0. A gas expands as shown in the graph. If the heat taken in during this process is J and atm= N/m 2, the change in internal energy of the gas (in J) is P(atm) A B V(m 3 ) a. b. c. d. e <= Five gas molecules are found to have speeds of 00, 200, 300, 400, and 500 m/s. The rms speed (in m/s) is a b c. 30. d <= e

5 5. One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a cm 3 enclosed vessel at 20 C. The pressure in the vessel, in N/m 2, is a. 09. b c. 32. d e <=. When we say that the speed of sound is measured under adiabatic conditions we assume that a. the time associated with heat conduction is slow relative to the speed of the wave. <= b. no heat can flow between the system and its surroundings. c. the speed of the wave is directly proportional to the bulk modulus. d. the speed of the wave is proportional to the square root of the bulk modulus. e. air is an ideal gas. 7. A bicycle pump contains air at STP (standard conditions for temperature and pressure). As the tire is pumped up, the volume of air decreases by 50% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change? a. 2 <= b. c. 0.5 d. 0. e A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 2 0 ( C), how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 50 F? a. 0 b. 2.5 c. 7.5 d. 5.0 <= e

6 9. A cup of coffee is enclosed on all sides in an insulated cup /2 cm thick in the shape of a cube 0 cm on a side. The temperature of the coffee is 95 C, and the temperature of the surroundings is 2 C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is cal/s cm C. a. 2 b. 74 <= c. 230 d. 0 e A 00-kg student eats a 200-Calorie doughnut. To burn it off, he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? ( food Calorie = 0 3 calories.) a. 273 b. 23 c. 48 d. 854 <= e. 8400

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### Bomb Calorimetry. Example 4. Energy and Enthalpy

Bomb Calorimetry constant volume often used for combustion reactions heat released by reaction is absorbed by calorimeter contents need heat capacity of calorimeter q cal = q rxn = q bomb + q water Example