# First Law of Thermodynamics

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## First Law of Thermodynamics Answer Key

1.

Which of the following terms comprises the surroundings and the system involved in the study of thermodynamics?

- an open system
- a closed system
- an isolated system
- the universe

2.

Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?

- [math]DeltaU=Q+W[/math]
- [math]DeltaU=W-Q[/math]
- [math]DeltaU=Q-W[/math]
- [math]DeltaU=Q+2W[/math]

3.

Which of the following systems does not allow for energy or matter to be exchanged with the surroundings?

- Open
- Closed
- Adiabatic
- Isolated

4.

Which of the following systems only allows for the exchange of energy with the surroundings?

- Closed
- Isolated
- Open
- None of the above

5.

Which system permits energy and matter to be exchanged with the surroundings?

- Isolated
- Open
- Adiabatic
- Closed

6.

In which of the following cases would [math]∆U[/math] in [math]∆U=Q+W[/math] be less than zero?

- Work is done on the system.
- Work is done by the system.
- The magnitudes of heat and work are equivalent.
- The magnitude of heat is greater than that of the work.

7.

Which of the following expressions correctly characterizes an isolated system?

- [math]∆U<0[/math]
- [math]∆U=0[/math]
- [math]∆U>0[/math]
- None of the above

8.

Which equation is associated with heat in a system that is thermally isolated?

- Q<0
- Q>0
- Q>W
- Q=0

9.

Complete the following equation for a mechanically isolated system: [math]∆U=[/math]Q.

10.

If a process is endothermic, the value of q is less than zero.

- True
- False

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