Question 1

A constant-volume gas thermometer has a pressure of 132.48 Pa at the triple point of water.What is the change of pressure that occurs for each one degree Kelvin change of temperature?

Accepted Answer

A)  0.48 Pa
B)  132.48 Pa
C)  131.52 Pa
D)  2.07 Pa A

Question 2

A nail penetrates into wood when hammered more easily than the hammer (if it misses the nail)because

Accepted Answer

A)  the pressure of the nail on the wood is higher than the pressure of the hammer on the wood.
B)  the force of the nail on the wood is higher than the force of the hammer on the wood.
C)  Both of the above statements are true. A

Question 3

18 g of water (H2O)contain 6.02 × 1023 atoms of hydrogen.

Accepted Answer

A) True 
 B)False  False

Question 4

In the equation pV = nRT,

Accepted Answer

A)  T is measured in degrees Celsius.
B)  R has different values for different gases.
C)  V is the velocity of the flowing gas.
D)  n is the number of moles of gas.

Question 5

What measures the average kinetic energy associated with random translational motion of molecules?

Accepted Answer

The answer of What measures the average kinetic energy associated...

Question 6

148.0 g of water is heated using 67.0 W of power,with perfect efficiency.How long will it take to raise the temperature of the water from 15ºC to 25ºC?

Accepted Answer

A)  92 s
B)  5.3 s
C)  22 s
D)  410,000 s

Question 7

Which of the following is a true statement?

Accepted Answer

A)  Several days after a snowstorm,the roof on Jones's house is uniformly covered with snow,whereas on Smith's house next door the snow has completely melted off.A likely reason for this is that Smith's house has better roof insulation than does Jones's.
B)  When you get out of a swimming pool and stand dripping wet in a breeze you feel colder than you would if your skin were dry.This is a purely psychological effect,since measurement of your skin temperature would yield the same value in both cases,wet or dry.
C)  In some regions the following sign is frequently seen as one approaches a bridge: "CAUTION: BRIDGE MAY BE ICY." One reason you might expect a bridge to be icier than the road leading up to it is that the bridge has both its top and bottom exposed to cold air,whereas only the top surface of the road is in contact with cold air.
D)  When the metal cooling coils in a freezer become coated with ice this helps the freezer more effectively remove heat from warm foods placed in the freezer.
E)  Thermos bottles have a vacuum between the inner and outer layers of glass in order to reduce heat transfer due to radiation,since radiation cannot travel through a vacuum.

Question 8

For an ideal gas the internal energy U depends only on

Accepted Answer

A)  volume.
B)  temperature.
C)  pressure.

Question 9

Heat is added to a 2.0 kg piece of ice at a rate of 793.0 kW.How long will it take for the ice at 0.0ºC to melt? (For water Lf = 334 kJ/kg and Lv = 2257 kJ/kg. )

Accepted Answer

A)  0.84 s
B)  530,000 s
C)  0.0 s
D)  670 s

Question 10

If you drop an ice cube at 0°C into boiling water,the ice will not change temperature until it has melted.

Accepted Answer

A) True 
 B)False

Question 11

At 0°C molecular motion ceases.

Accepted Answer

A) True 
 B)False

Question 12

A .20 kg ice cube at 0.0°C has sufficient heat added to it to cause total melting,and the resulting water is heated to 70.0ºC.How much heat is added? (For water Lf = 334 kJ/kg and Lv = 2257 kJ/kg. )

Accepted Answer

A)  130 kJ
B)  14,000 kJ
C)  81 kJ
D)  59 kJ

Question 13

The figure shows a 50 kg lead cylindrical piston that floats on 0.68 mol of compressed air at 30°C.How far does the piston move if the temperature is increased to 300°C?

Accepted Answer

A)  120 cm
B)  250 cm
C)  130 cm
D)  1300 cm

Question 14

A glass beaker of unknown mass contains 65.0 mL of water.The system absorbs 2000.0 cal of heat and the temperature rises 20.0ºC as a result.What is the mass of the beaker? (The specific heat for glass is .18 cal/g · ºC. )

Accepted Answer

A)  190 g
B)  560 g
C)  540 g
D)  270,000 g

Question 15

What is the average speed of oxygen molecules at 154 K? Oxygen is assumed to approximate an ideal gas.The mass of one O2 molecule is 5.312 × 10-26 kg.

Accepted Answer

A)  346 m/s
B)  2.19 m/s
C)  8.15 × 1011 m/s
D)  6.33 m/s

Question 16

Two objects,A and B,are not in thermal equilibrium with each other.Object C is in thermal equilibrium with object A.What can you say about objects B and C with respect to thermal equilibrium?

Accepted Answer

The answer of Two objects,A and B,are not in thermal...

Question 17

A heat conducting rod,1.60 m long,is made of an aluminum section,0.90 m long,and a copper section,0.70 m long.Both sections have a cross-sectional area of 0.0004 m2.The aluminum end and the copper end are maintained at temperatures of 30°C and 170°C,respectively.The thermal conductivities of aluminum and copper are 205 and 385 W/m ∙ K,respectively.The rate at which heat is conducted in the rod is closest to:

Accepted Answer

A)  9.0 W
B)  7.9 W
C)  10 W
D)  11 W
E)  12 W

Question 18

An ideal gas goes from point A to point B on a PV diagram.If A and B are at the same temperature,then they must be the same point.

Accepted Answer

A) True 
 B)False

Question 19

An ideal gas is heated.If the gas is in a container that prevents its volume from changing,what happens to the pressure?

Accepted Answer

The answer of An ideal gas is heated.If the gas...

Question 20

A brass rod is 69.5 cm long and an aluminum rod is 49.3 cm long when both rods are at an initial temperature of 0°C.The rods are placed in line with a gap of 1.2 cm between them.The distance between the far ends of the rods is maintained at 120.0 cm throughout.The temperature is raised until the two rods are barely in contact.The coefficients of linear expansion of brass and aluminum are 2.0 × 10-5 K-1 and 2.4 × 10-5 K-1 ,respectively.In the figure,the temperature at which contact of the rods barely occurs,in °C,is closest to:

Accepted Answer

A)  466
B)  443
C)  420
D)  490
E)  513

Exam 12: Thermal Properties of Matter

A constant-volume gas thermometer has a pressure of 132.48 Pa at the triple point of water.What is the change of pressure that occurs for each one degree Kelvin change of temperature?

A nail penetrates into wood when hammered more easily than the hammer (if it misses the nail) because

18 g of water (H₂O)contain 6.02 × 10²³ atoms of hydrogen.

In the equation pV = nRT,

What measures the average kinetic energy associated with random translational motion of molecules?

148.0 g of water is heated using 67.0 W of power,with perfect efficiency.How long will it take to raise the temperature of the water from 15ºC to 25ºC?

Which of the following is a true statement?

For an ideal gas the internal energy U depends only on

Heat is added to a 2.0 kg piece of ice at a rate of 793.0 kW.How long will it take for the ice at 0.0ºC to melt? (For water L_f = 334 kJ/kg and L_v = 2257 kJ/kg. )

If you drop an ice cube at 0°C into boiling water,the ice will not change temperature until it has melted.

At 0°C molecular motion ceases.

A .20 kg ice cube at 0.0°C has sufficient heat added to it to cause total melting,and the resulting water is heated to 70.0ºC.How much heat is added? (For water L_f = 334 kJ/kg and L_v= 2257 kJ/kg. )

The figure shows a 50 kg lead cylindrical piston that floats on 0.68 mol of compressed air at 30°C.How far does the piston move if the temperature is increased to 300°C?

A glass beaker of unknown mass contains 65.0 mL of water.The system absorbs 2000.0 cal of heat and the temperature rises 20.0ºC as a result.What is the mass of the beaker? (The specific heat for glass is .18 cal/g · ºC. )

What is the average speed of oxygen molecules at 154 K? Oxygen is assumed to approximate an ideal gas.The mass of one O₂ molecule is 5.312 × 10^-26 kg.

Two objects,A and B,are not in thermal equilibrium with each other.Object C is in thermal equilibrium with object A.What can you say about objects B and C with respect to thermal equilibrium?

An ideal gas goes from point A to point B on a PV diagram.If A and B are at the same temperature,then they must be the same point.

An ideal gas is heated.If the gas is in a container that prevents its volume from changing,what happens to the pressure?