Exploring Creation Chemistry Module #13 Test
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01. What kinds of reactions feel hot to the touch, exothermic or endothermic?
02. State Hess's Law and write down the equation that results from it.
03. Which diagram(s) represent(s) an endothermic reaction?
04. Which diagram represents the reaction that is easiest to start?
05. What is the AH for the reaction represented by diagram II?
06. If I have 30.0 grams of carbon in one pile and 50.0 grams of carbon in the other, which sample of carbon has more entropy?
07. If a reaction is endothermic and has a positive AS, what should you do to the temperature in order to make sure the reaction will run?
08. What is the AH for the combustion of methane (CH
4
)?
09. What is the AH for the combustion of methanol (CH
3
OH (I))?
10. Using your answer from #9, how much energy will you get from burning 245.0 g of methanol in excess oxygen?
11. If you were to calculate a reaction's AH using bond energies, yo uwould most likely get a slightly different answer than when you use Hess's Law. Why?
12. Give the sign of AS in the following reactions:
a. CaSO
4
(s) -> CaO (s) + SO
3
(g)
b. 2H
2
(g) + O
2
(g) -> 2H
2
O (g)
c. 2AgNO
3
(aq) + Mg(OH)
2
(aq) -> 2AgOH (s) + Mg(NO
3
)
2
(aq)
13. The AS for the following reaction:
C
2
H
4
(g) + 3O
2
(g) -> 12CO
2
(g) + 2H
2
O (g)
is 50.1
. What is the absolute entropy of O
2
(g)?
14. What is AG for the following reaction at 273 K?
2C
6
H
6
(I) + 15O
2
(g) -> 12CO
2
(g) + 6H
2
O (g)
15. If a reaction has a AH of -120.0 kcals/mole and is spontaneous for all temperatures less than 200.0 K, what is its AS?