Name:

1. Define heat
   

2. Distinguish between heat and temperature
   

3. Define Gibbs Free Energy and explain what it describes.
   

4. What is Hess's Law?
   

5. What is meant by the statement: "Enthalpy is a state function?
   

The heats of formation for the compounds are located in the back of your book.
        Please show all work on paper and submit in class.

6. For the reaction: 4Al(s)  +  6H₂O(l) --> 2Al₂O₃(s)  +  6H₂(g), determine:
    (a) The enthalpy for this reaction.
    (b) Whether the reaction is exothermic or endothermic.
    (c) How much heat energy is produced or absorbed if 7.998 g of Al₂O₃ is produced.

7. Given the entropy change for the first two reactions below, calculate the entropy
    for the third reaction.

                    S₈(s)  +  8O₂(g)  -->  8SO₂(g)         [delta]S = 89 J/K

                    2SO₂(s)  +  O₂(g)  -->  2SO₃(g)        [deltat]S = -188 J/K

                    S₈(s)  +  12O₂(g) --> 8SO₃(g)           [delta]S = ??

8. A reaction has an enthalpy value of -356 kJ and an entropy value of -36 J/K. Calculate
    the Gibbs Free Energy for this reaction at 25 ^oC.

9.  Predict whether the entropy value is positive or negative for the following process:

Ag⁺(aq)  +  Cl^-(aq)  -->  AgCl(s)

[Click on the appropriate box below]

                The entropy value is positive    The entropy value is negative

Identify the movie: Click here