Accelerated Chemistry Chapter 15 Practice Test: Thermodynamics
Name: _________________
Period: ________________
Complete the following questions – on show work problems show all work, substitution, units and
report answers to the proper number of sig figs.
1. Convert 393 Joules to Calories (Kcal)
2. How many calories would it take to raise 100 grams of water 10 degrees Celsius? ___________
3. At 25 degrees Celsius a process had a of -125 KJ and a S of -200 J/K. Calculate G and
identify if this process is spontaneous.
4. H2O (s) → H2O (l) has the following signs for ______ H __________ S and at 30 degrees
Celsius ____________ G
5. For an exothermic process, products have _______________ energy than reactants
6. In chemistry Kinetic energy is shown as _________________________ and potential energy is
energy stored in __________________
7. What state of matter has the highest kinetic energy ____________________ and what state of
matter has the lowest entropy __________________
8. Define - H ______________________ - S _________________ and - G _________________
9. According to the Gibbs Free Energy equation at _____________temperatures Entropy plays a
small roll in the spontaneity of a system.
10. If a spontaneous process is endothermic, the process is “driven” by _____________________ an
if a spontaneous process has a decrease in entropy than it must by “driven” by
________________
11. What is the System and Surroundings added together? _______________________
12. If the H of a system is -250 KJ than the H of the surroundings is ____________________
13. What is the Hf of Mg (s) ___________________. What is the sign of the Hf of Mg (l)
__________
14. A process is never thermodynamically favored (Spontaneous) if it has a _________ H and a
___________ S
15. Granite has a specific heat of .47 J/g*C and Aluminum has a specific heat of .897 J/g *C. If a
100.0g substance sits in the sun on a hot summer day which substance will heat up faster?
_____________________
16. A student wants to measure the H in a lab what instrument should they use? ______________
17. Methanol, CH3OH has an Hvap of 37.6 KJ/mol and Hfusion of 3.18 KJ/mol. What is the amount of
heat required to convert 25.0g of methanol from a liquid to a vapor.
