# Laws of Thermodynamics (Grades 11-12)

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## Laws of Thermodynamics

**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.

The first law of thermodynamics states that

- components of a system interact.
- entropy of a closed system always increases.
- a closed system always shifts toward disorder or homogeneity.
- energy is always conserved.

2.

As stated by the second law of thermodynamics, energy transformations

- are never accompanied by heat returning to the universe
- decrease entropy of the universe
- increase entropy of the universe
- decrease randomness or disorder of the universe
- are always accompanied by a loss of light energy to the environment

3.

The second law of thermodynamics states that the energy in the universe is constantly increasing.

- True
- False

4.

If [math]DeltaS[/math] denotes entropy change, then what is the entropy change for a reversible adiabatic process?

- [math]DeltaS = 0[/math]
- [math]DeltaS = 1[/math]
- [math]Delta S < 1[/math]
- [math]DeltaS >1[/math]

5.

A thermodynamic variable which depends not only on the current state of the system, but also on the path taken to reach that state, is called a

- state function.
- process function.

6.

According to the Second Law of Thermodynamics, which of the following will never decrease in value for an isolated system?

- temperature
- volume
- heat energy
- entropy

7.

If your chemistry teacher asks you to compare the entropies of a solution of barium chloride and barium chloride solid, you know that you are comparing measures of .

- order
- disorder
- state functions
- process functions

8.

When thermodynamic equilibrium exists for a system, there exists entropy.

- maximum
- minimum
- zero
- undefined

9.

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]

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