Exam 5: Temperature and Heat

A constant volume and mass of helium gas at 27°C is heated so that the pressure of the gas doubles. What is the new temperature of the gas in Celsius degrees?

The ice point and the steam point of water are commonly called the ______________ point and the ______________ point, respectively.

When a material is found to have no definite volume and no definite shape, what is the phase of the material?

On bare feet, a tile floor feels colder than a rug because the tile has a greater ______________.

The piston of a cylinder containing a quantity of ideal gas is advanced so that the volume of the gas is decreased by one-half. A pressure gauge on the cylinder shows the pressure of the gas to have increased threefold in the process. By what factor does the temperature of the gas change?

In a heat pump,

How much heat is necessary to change 30 g of water at 10°C into water at 80°C?

The energy needed to change the phase of a substance is called ______________.

The impossibility of reaching a temperature of absolute zero is incorporated in

Heat transfer from hot or cold liquids in a thermos bottle is prevented by ______________.

An ideal gas is confined to a container with an adjustable volume. If the number of molecules and the temperature are held constant, by what factor will the volume change when the pressure is tripled?

On a winter day the temperature drops from -5°C to -15°C overnight. If a pan sitting outside contains 0.40 kg of ice, how much heat is removed from the ice for this temperature change?

If 700 Joules of heat is added to a system, and the internal energy increases by 450 Joules, how much work is done by the system?

The energy balance in a thermodynamic process is expressed in the ______________.

If 700 Joules of heat is added to a system, while the system does 550 Joules, by how much does the internal energy increase?

______________ is the process whereby energetic molecules escape from a liquid.

The number of molecules in a container is tripled and the Kelvin temperature doubled. The volume remains unchanged. The new pressure will be how many times greater than the original pressure?

Which laboratory observation would most support the kinetic theory's assumption that gas molecules have little attraction for one another?

If the temperature of a quantity of ideal gas increases, then

When heat is added to a closed system, it goes into