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?

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:

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?

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: