Exam 12: Thermal Properties of Matter

An oxygen molecule falls in a vacuum.From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 800 K?

A glass flask has a volume of 500 ml at a temperature of 20°C.The flask contains 492 ml of mercury at an equilibrium temperature of 20°C.The temperature is raised until the mercury reaches the 500 ml reference mark.The coefficients of volume expansion of mercury and glass are 18 × 10^-5 K^-1 and 2.0 × 10^-5 K^-1,respectively.The temperature at which this occurs,in °C,is closest to:

An ideal gas inside box A of volume V has a temperature T and contains N molecules.An ideal gas inside box B of volume V/2 has a temperature T/2,and also contains N molecules.In which box is the pressure the highest?

A 24 liter tank contains ideal helium gas at 27°C and a pressure of 22.0 Atm.How many moles of gas are in the tank?

When you compress a gas,the molecules get smaller.

Which of the following is a FALSE statement?

The pressure of an ideal gas in a sealed rigid container is directly proportional to its temperature only if the temperature is measured in K.

A container with rigid walls is filled with 4 mol of air with C_v = 2.5R.How much does the internal energy change if the temperature rises from 16ºC to 437ºC?

What is the total translational kinetic energy in a classroom filled with nitrogen at 1.01 × 10⁵ Pa and 20.7ºC? The dimensions of the classroom are 4.60 m × 5.20 m × 8.80 m.

You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze,you feel much colder than you feel after you dry off.Why is this?

A sphere of surface area 1.25 m² and emissivity 1.0 is at a temperature of 100.0°C.The rate at which it radiates heat into empty space is closest to

A cold trap is set up to cause molecules to linger near the suction in a vacuum system.If the cold trap has an effective volume of .200 L and is maintained at 13.0 K,how many molecules are in it at 10.0 Pa of pressure? (Avogadro's number is 6.022 × 10²³ mol^-1,and the universal gas constant is 8.314 J/K · mol.Assume the behavior of an ideal gas. )

Doubling the root mean square speed of the molecules of a gas has a greater effect on its pressure than doubling the number of gas molecules in the container.

114.0 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?

A 7 kg sample of mercury is completely solidified and liberates 81.06 kJ of energy.What is the original temperature of the mercury? (The melting point of mercury is 234 K,the heat of fusion of mercury is 11.3 kJ/kg,and the specific heat of mercury is 140 J/kg·K. )

An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of 15°C.Both rods have the same diameter.The rods are joined end-to-end to form a rod 60.0 cm long.The coefficients of linear expansion of aluminum and steel are 2.4 x 10^-5 K-1,and 1.2 × 10-⁵ K-1,respectively.The temperature is raised to 90°C.The increase in the length of the joined rod,in mm,is closest to:

An air bubble is formed at the bottom of a lake,and begins rising toward the surface.The air is hotter than the water.If the temperature of the air remains constant as the bubble rises,the volume of the bubble will

A flask contains a mixture of argon and neon gases.The root-mean-square speed of the argon gas is determined to be 1210 m/s.What is the root-mean-square speed of the neon gas? The atomic masses are argon,39.95 g/mole;neon,20.18 g/mole.

An object having an emissivity 0.725 radiates heat at a rate of 10 W when it is at a temperature T.If its temperature is doubled,it will radiate at a rate of

0.20 g of hydrogen gas are held in a rigid container.The temperature of the gas is changed from 50 K to 80 K.How much heat is needed?