AP Chemistry Quiz Unit 9

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Thermodynamics tells us what information? *

1 point

The direction in which a process will occur

The speed of a reaction

The rate of a reaction

The chemical pathway

2. For the following image, what is the change in entropy? *

1 point

Negative Sign

Positive Sign

No change in sign

Cannot be determined due to the given information

3. Predict the sign of entropy change for this reaction *

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Positive Sign

Negative Sign

The sign is the same

This information cannot be determined

4. The following reaction is thermodynamically favorable. What are the signs for both the Delta G and Delta S. *

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Delta G is negative; Delta S is negative

Delta G is negative; Delta S is positive

Delta G is positive; Delta S is positive

Delta G is positive; Delta S is negative

5. Adding a catalyst does what? *

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Changes the delta G

Changes activation energy

Changes the thermodynamic favorability

Changes if a reaction is spontaneous or not

6. For the following reaction the delta G and delta H are negative. When the chemical reaction occurs no formation is observed. What explains this result? *

1 point

There is too high of an activation energy making the rate of the reaction very slow.

The K value is too small, therefore hardly any product is formed.

The reaction is at too high of a temperature to occur.

Not enough energy to complete the reaction.

7. The reaction below is thermodynamically favored at a certain temperature. Delta H is 200 kj/mol and Delta S is 170 kj/mol. If the temperature is now 2000 K, which of the following explains if the reaction is thermodynamically favorable or unfavorable. *

1 point

At 2000 K the delta G is negative, therefore making it favorable.

At 2000 K the delta G is positive, therefore making it unfavorable.

At 2000 K the delta G is negative, therefore making it unfavorable.

At 2000 K the delta G is positive, therefore making it favorable.

8. What is the delta H for NaOH when 5 grams of NaOH are burned, and 200 joules of energy are released. *

1 point

-2000 joules

-1600 joules

2000 joules

1600 joules

9. When water is boiled what happens to the sign of entropy. *

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Entropy is positive.

Entropy is negative.

Entropy does not change with phase changes.

Entropy cannot be determined from the given information.

10. For the following reaction, decide the thermodynamic favorability. *

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Thermodynamically favorable at all temperatures.

Thermodynamically favorable at high temperatures

Thermodynamically favorable at low temperatures

Thermodynamically unfavorable at all temperatures

11. For the following reaction, what is the Keq *

1 point

-98

1.2 x 10⁻³

1.06

12. For the following chemical reaction at 50 degrees celsius what are the signs for delta S, G, and H. *

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(^G) +( ^H) - (^S) -

(^G) -( ^H) - (^S) -

(^G) -( ^H) + (^S) +

(^G) +( ^H) - (^S) +

13. For the reaction which is at equilibrium, what becomes true. *

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Delta H< 0

Delta G = 0

Delta H = 0

Delta S = 0

14. The following reaction has a delta H value of 200 kj. The Delta G value is 0. What is the entropy for the following system at 40 K? *

1 point

5 j/k

5000 j/k

7000 j/k

7 j/k

15. The following reaction has a delta G value of -400 kj when at 298 K. Looking at the answer choice which describes both the thermodynamically favorability as well as the K value. *

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K is greater than 1; this is a spontaneous reaction

K is less than 1; this is a nonspontaneous reaction

K is is greater than 1; this is a nonspontaneous reaction

K is less than 1; this is a spontaneous reaction

16. Which of the following gives the best description of the following cell. *

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The cell is electrolytic.

The cell is galvanic.

The cell has both characteristics of electrolytic and galvanic cells.

The cell has neither characters.

The following diagram should be used for both 17-18.

17. What is the balanced equation for the following reaction? *

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Ag+ + Cu(s) -----> Ag(s) + Cu2+

2Ag+ + Cu(s) -----> 2Ag(s) + Cu2+

Cu2+ + Ag(s) -----> Ag+ Cu(s)

Cu2+ + 2Ag(s) -----> 2Ag+ Cu(s)

18. What is the standard cell potential? *

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-.46 V

.46 V

1.14 V

.80 V

19. When at equilibrium the reaction does not shift towards either the reactants or products. For which of the following values equal to 0. *

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K, Q

Delta G

K, Delta G

Delta G, E cell

20. What is the current of Sn(SO4)2 if 5 grams of solid Sn are produced in 10 seconds. *

1 point

96500 C

2.0 x 10^2 secs

8.1 x 10^2 secs

10 x 10^3 secs

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