ch. 6, 16, & 8.8  thermodynamics       test                              65 points                      AP chemistry

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

In problems involving any calculation, show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. Based on the following (hypothetical) experimental data, determine the ___.  [20 points]

# g of ice =

10.0

# mL of water =

50.0

Initial temperature (ºC) =

21.0

Final temperature (ºC) =

7.0

a. Heat of fusion of water (in kJ / mol)

b. Calorimeter’s heat capacity.  Hint: use the theoretical value of the heat of fusion of water


2. What is the heat in the reaction:   8.0 g C2H4   +   10.0 g Cl2  -->  C2H3Cl3  +  HCl ?   [15 points]

3. Based on thermodynamic principles, estimate the boiling point of butane.  [10 points]

4. What is the relative magnitude of the formation of a hydration shell versus the solid sodium hydroxide becoming sodium and hydroxide ions in the context of dissolving solid sodium hydroxide in water ?  Rationalize.  [10 points]

5.  Old topic:  What is the relative lattice energy between sodium chloride versus potassium chloride ?  Rationalize.  [10 points]