Question 1

Which branch of chemistry studies the rate at which reactants change into products?

Accepted Answer

Kinetics

Question 2

Le Chatelier's Principle states that when a system at equilibrium is disturbed, it will:

Accepted Answer

Shift to counteract the disturbance and restore equilibrium

Question 3

For the endothermic reaction $4	ext{NH}_3 (g) + 3	ext{O}_2 (g) ightarrow 2	ext{N}_2 (g) + 6	ext{H}_2	ext{O} (g)$, which change will shift the equilibrium to the right?

Accepted Answer

Increasing the temperature

Question 4

Which of the following will NOT cause a shift to the left for the reaction $	ext{CH}_4 (g) + 	ext{F}_2 (g) ightleftharpoons 	ext{CF}_4 (g) + 	ext{HF} (g)$?

Accepted Answer

Decrease the container volume

Question 5

For the reaction $2	ext{A} (g) + 3	ext{B} (g) ightleftharpoons 	ext{C} (g)$, the equilibrium constant $K$ increases with temperature. What does this indicate?

Accepted Answer

The reaction is endothermic

Question 6

If a catalyst is added to the reaction $	ext{CaCO}_3 (s) ightleftharpoons 	ext{CaO} (s) + 	ext{CO}_2 (g)$, what happens?

Accepted Answer

The equilibrium position does not change but the rate increases

Question 7

For the gas reaction $2	ext{A}_2 (g) + 	ext{B}_2 (g) ightarrow 2	ext{AB} (g)$, which container proceeds more to completion if container A has more product molecules than container B?

Accepted Answer

Container A

Question 8

For the reaction $4	ext{NH}_3 (g) + 3	ext{O}_2 (g) ightarrow 2	ext{N}_2 (g) + 6	ext{H}_2	ext{O} (g)$, what is the effect of removing H$_2$O(g) from the system?

Accepted Answer

The reaction shifts to the right

Question 9

Which of the following changes will increase the yield of products for an exothermic reaction at equilibrium?

Accepted Answer

Decreasing the temperature

Question 10

For the reaction $	ext{CH}_4 (g) + 	ext{F}_2 (g) ightleftharpoons 	ext{CF}_4 (g) + 	ext{HF} (g)$, what is the effect of increasing the partial pressure of HF?

Accepted Answer

Shift to the left

Question 11

Which statement best describes the effect of decreasing the volume of a container for a reaction with more moles of gas on the reactant side?

Accepted Answer

The equilibrium shifts toward the side with fewer moles of gas

Question 12

For the reaction $2	ext{A} (g) + 3	ext{B} (g) ightleftharpoons 	ext{C} (g)$, what happens to the equilibrium if B is removed?

Accepted Answer

Shifts to the left

Question 13

Which of the following will increase the rate of a chemical reaction but not affect the equilibrium position?

Accepted Answer

Adding a catalyst

Question 14

For an endothermic reaction, which change will increase the equilibrium constant $K$?

Accepted Answer

Increase the temperature

Question 15

If the equilibrium constant $K$ for a reaction is very large, what does this indicate?

Accepted Answer

The reaction favors products

Question 16

Which of the following changes will shift the equilibrium to the right for the reaction $	ext{CaCO}_3 (s) ightleftharpoons 	ext{CaO} (s) + 	ext{CO}_2 (g)$?

Accepted Answer

Removing CO$_2$

Question 17

For the reaction $2	ext{A}_2 (g) + 	ext{B}_2 (g) ightarrow 2	ext{AB} (g)$, what is the effect of adding an inert gas at constant volume?

Accepted Answer

No effect on equilibrium

Chemical Equilibrium and Le Chatelier’s Principle: Study Notes for GOB Chemistry

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