Question

5. Which of the below are ways that allow you to recognize equilibrium?

a. constant temperature

b. constant color

c. constant pressure

d. All of the above are correct.

e. None of the above are correct.

6. Equilibrium is a state of dynamic molecular behavior, meaning that

a. the reaction eventually comes to a stop.

b. reactants continually turn into products at a progressively slower rate.

c. products continually turn into reactants at a progressively faster rate.

d. reactants turn into products and products turn into reactants at different rates.

e. reactants turn into products and products turn into reactants at equal rates.

The aqueous reaction:

Fe⁺³ + SCN^- <--> FeSCN⁺²

Is at equilibrium, the reactants are Light Yellow and the products are Deep Red

Use this equilibrium to answer questions 7 - 9.

7. Adding Fe(NO₃)₃ would produce the following change in the equilibrium:

a. The color in the test tube became a deeper red color because the equilibrium shifted to make more reactants.

b. The color in the test tube became a deeper red color because the equilibrium shifted to make more products.

c. The color in the test tube became a lighter color because the equilibrium shifted to make more reactants.

d. The color in the test tube became a lighter color because the equilibrium shifted to make more products.

e. None of the above are correct.

8. Adding AgNO₃ to the test tube would remove SCN - from the reaction, causing the reaction to

a. produce more reactants.

b. decrease the amount of products.

c. produce a deeper red color.

d. A, B, and C are all correct.

e. A and B are both correct.

9. The reaction studied becomes a deeper red color when placed in an ice bath. This means that the reaction is

a. exothermic.

b. endothermic.

c. There is not enough information given to answer the qusestion.

d. None of the above are correct.

Need all parts answered, please show all work and explanations! Thank you in advance!

Answer 1

Answer (5)

(d) All of above are correct.

Because for system to be equilibrium, constant temperature, pressure, and color are required means all physical properties to be constant.

Answer (6)

Equilibrium is a state of dynamic molecular behavior, meaning that (e) reactants turn into products and products turn into reactants at equal rates.

Explanation: when the reaction occurs, the rates of forth and back reactions are different. For normal reaction, the rate of forth reaction is much bigger than that of the back one. Then, with time the rate of forth reaction decreases and at equilibrium the rates of forth and back reactions are equal. So, at the equilibrium, the reaction doesn’t stop at all. You still have some reactants and some products, and the reaction is going both ways. But as the rates are equal, the effective composition of the system doesn’t change. This equilibrium is stable: small changes in the conditions result in small changes in the system.

Answer (7)

(b) The color in the test tube became a deeper red color because the equilibrium shifted to make more products.

Answer (8)

(e) A and B are both correct.

Answer (9)

(a) exothermic.