The first law of Thermodynamics

A closed system is one in which

• Mass does not cross boundaries of the system, though energy may do so

• Mass crosses the boundary but not the energy

• Neither mass nor energy crosses the boundaries of the system

• Both energy and mass cross the boundaries of the system

What does the heat capacity of an object measure?

• the amount of energy required to change the temperature of an object
• the total amount of energy an object can store
• the thermal potential energy of the object
• the amount of work done by the object
• the amount of energy required to melt a solid object

When applying the first law of thermodynamics to a system, when is heat a positive quantity?

• when the system does work
• when the system has work done on it
• when the system absorbs heat
• when the system loses heat
• when no work is done either on the system or by the system

The First Law of Thermodynamics describes the conservation of energy

• True

• False

What is internal energy?

• The amount of heat an object contains.
• The sum of the kinetic and potential energy of the particles of a substance.
• Something we can measure easily.
• Something that does not exist.

All gases and vapors approach ideal gas behavior at?

• High pressure and high density

• Low pressure and low density

• High pressure and low density

• Low pressure and high density

Work done by a system is taken to be

• positive

• negative

• zero

• varies according to situation

A container filled with a sample of an ideal gas at the pressure of 1.5 atm. The gas is compressed isothermally to one-fourth of its original volume. What is the new pressure of the gas?

• 1 atm

• 3 atm

• 4 atm

• 6 atm

A real gas behaves as an ideal gas when?

• Temperature approaches zero

• Pressure approaches zero

• Both temperature and pressure approaches zero

• None of the mentioned

Work is a

• point function/state function

• path function

• depends on the state

• none of the mentioned