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## Thermal Energy

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
What is the second Law of Thermodynamics?

2.
What is the assumption made by the Zeroth Law of Thermodynamics?

3.
The first law of thermodynamics states that
1. components of a system interact.
2. entropy of a closed system always increases.
3. a closed system always shifts toward disorder or homogeneity.
4. energy is always conserved.
4.
The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus
1. the amount of heat that is not conserved.
2. the amount of work done by the system on its surroundings.
3. the original internal energy.
4. the volume difference.
5.
As stated by the second law of thermodynamics, energy transformations
1. are never accompanied by heat returning to the universe
2. decrease entropy of the universe
3. increase entropy of the universe
4. decrease randomness or disorder of the universe
5. are always accompanied by a loss of light energy to the environment
6.
The                                          is defined as the enthalpy change, when one mole of a substance is formed from its constituent elements, which are in their standard states at a given temperature and pressure.
7.
If H = Enthalpy = Total heat content of a system, E = Internal energy, and PV = pressure-volume type of work, which of the following equations correctly describes the relation of these parameters?
1. $H = E// (PV)$
2. $H = E + PV$
3. $H = E - PV$
4. $H = E xx PV$
8.
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
1. the entropy of the system.
2. the enthalpy of the system.
3. the internal energy of the system.
4. the translational energy of the system.
9.
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. $DeltaU=Q+2W$
10.
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
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