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# First Law of Thermodynamics (Grades 11-12)

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## First Law of Thermodynamics

1.
Which of the following terms comprises the surroundings and the system involved in the study of thermodynamics?
1. an open system
2. a closed system
3. an isolated system
4. 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?
1. $DeltaU=Q+W$
2. $DeltaU=W-Q$
3. $DeltaU=Q-W$
4. $DeltaU=Q+2W$
3.
Which of the following systems does not allow for energy or matter to be exchanged with the surroundings?
1. Open
2. Closed
4. Isolated

4.
Which of the following systems only allows for the exchange of energy with the surroundings?
1. Closed
2. Isolated
3. Open
4. None of the above
5.
Which of the following systems allows for the exchange of both energy and matter with the surroundings?
1. Isolated
2. Open
4. Closed

6.
In which of the following cases would $∆U$ in $∆U=Q+W$ be less than zero?
1. Work is done on the system
2. Work is done by the system
3. The magnitudes of heat and work are equivalent
4. The magnitude of heat is greater than that of the work
7.
Which of the following expressions correctly characterizes an isolated system?
1. $∆U<0$
2. $∆U=0$
3. $∆U>0$
4. None of the above

8.
Which of the following equations always characterizes heat in a thermally isolated system?
1. Q<0
2. Q>0
3. Q>W
4. Q=0
9.
Complete the following equation for a mechanically isolated system: $∆U=$          .

10.
If a process is endothermic, the value of q is less than zero.
1. True
2. False
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