Quiz about Factors Affecting Equilibrium

Question 1

The three factors that affect the equilibrium of a reaction are temperature, pressure and __________.

Accepted Answer

concentration

Answer

entropy

Answer

enthalpy

Answer

catalyst

Answer

reactivity

Question 2

The following factors affect the position of equilibrium EXCEPT

Accepted Answer

States of matter

Answer

Concentration

Answer

Pressure

Answer

Temperature

Question 3

What would happen when H₂O is added?

Accepted Answer

Position of equilibrium will shift to right (and become more pink)

Answer

Position of equilibrium will shift to left (and become more blue)

Answer

K_eq will increase as H₂O is added

Answer

Position of equilibrium will shift to left to reduce the added H₂O

Question 4

What are the two factors to look for when determining if the reaction is at equilibrium?

Accepted Answer

Forward and reverse reaction rates are equal and concentration is constant

Answer

Forward reaction rate is faster than the reverse and concentrations are equal

Answer

Forward and revers reaction rates are equal and concentration is equal

Answer

Forward reaction rate is faster than the reverse and concentration is equal

Question 5

A very high value for K indicates that

Accepted Answer

products are favored.

Answer

reactants are favored.

Answer

equilibrium is reached slowly.

Answer

equilibrium has been reached

Question 6

What will happen when CI^- ions are added?

Accepted Answer

Position of equilibrium will shift to left to reduce the added CI^- ions

Answer

Position of equilibrium will shift to left and become more pink

Answer

Color of system will turn to all pink

Answer

Concentration of reactants and products remain unchanged

Question 7

Using a catalyst,will ______________ .

Accepted Answer

increase the rate of both forward and backward reactions

Answer

shift equilibrium right

Answer

shift equilibrium left

Answer

have no effect on the rate nor on the equilibrium

Answer

increase the rate of the backward reaction only

Question 8

Le Chatelier's Principle states that if a chemical system at equilibrium is stressed,the system will _____________ .

Accepted Answer

adjust to reduce the stress

Answer

adjust to increase the stress

Answer

not adjust no matter what

Answer

become more complicated

Answer

keep its initial conditions

Question 9

Given: 2A(g) <-> 2B(g) + C(g). At a particular temperature, K_eq= 1.6x10⁴.Raising the pressure of the system by lowering the volume of the container will cause _____________ .

Accepted Answer

to increase

Answer

no effect on

Answer

no effect on and

Question 10

What will happen when OH^- ions are added to the system? HINT: They remove the H+ ions.

Accepted Answer

Position of equilibrium will shift to left and become more yellow

Answer

Position of equilibrium will shift to right and become more orange

Answer

Position of equilibrium will shift to right and become more yellow

Answer

OH^- ions will not react, and thus no change is seen.

Question 11

Which of the following factors does NOT affect the position of equilibrium in a chemical reaction?

Accepted Answer

Catalyst

Answer

Temperature

Answer

Pressure

Answer

Concentration

Question 12

According to Le Chatelier's Principle, what happens to the equilibrium position when the concentration of a reactant is increased?

Accepted Answer

Shifts to the right

Answer

Shifts to the left

Answer

Remains unchanged

Answer

Equilibrium constant changes

Question 13

In the reaction @@ ext{N}_2(g) + 3 ext{H}_2(g) ightleftharpoons 2 ext{NH}_3(g) + ext{heat}@@, what is the effect of decreasing temperature?

Accepted Answer

Shifts equilibrium to the right

Answer

Shifts equilibrium to the left

Answer

No effect on equilibrium

Answer

Increases the rate of reaction

Question 14

For the equilibrium reaction @@ ext{A}(g) + ext{B}(g) ightleftharpoons ext{C}(g)@@, what is the effect of increasing pressure?

Accepted Answer

Shifts equilibrium to the right

Answer

Shifts equilibrium to the left

Answer

No effect on equilibrium

Answer

Decreases the rate of reaction

Question 15

What is the effect of adding a catalyst to a reaction at equilibrium?

Accepted Answer

Increases the rate of both forward and reverse reactions

Answer

Shifts equilibrium to the right

Answer

Shifts equilibrium to the left

Answer

Decreases the rate of reaction

Question 16

In an exothermic reaction, what is the effect of increasing temperature on the equilibrium position?

Accepted Answer

Shifts to the left

Answer

Shifts to the right

Answer

No effect on equilibrium

Answer

Increases the rate of reaction

Question 17

Which of the following statements is true about a system at equilibrium?

Accepted Answer

The rates of the forward and reverse reactions are equal

Answer

The concentrations of reactants and products are equal

Answer

The reaction has stopped

Answer

The equilibrium constant is zero

Question 18

For the reaction @@ ext{2SO}_2(g) + ext{O}_2(g) ightleftharpoons ext{2SO}_3(g) $$, what happens if $$ ext{SO}_3@@ is removed from the system?

Accepted Answer

Shifts equilibrium to the right

Answer

Shifts equilibrium to the left

Answer

No effect on equilibrium

Answer

Decreases the rate of reaction

Question 19

What is the effect of decreasing the volume of the container on the equilibrium position of a gaseous reaction?

Accepted Answer

Shifts towards the side with fewer moles of gas

Answer

Shifts towards the side with more moles of gas

Answer

No effect on equilibrium

Answer

Increases the rate of reaction

Question 20

In the reaction @@ ext{H}_2(g) + ext{I}_2(g) ightleftharpoons ext{2HI}(g) $$, what is the effect of adding more $$ ext{H}_2@@?

Accepted Answer

Shifts equilibrium to the right

Answer

Shifts equilibrium to the left

Answer

No effect on equilibrium

Answer

Decreases the rate of reaction

Question 21

Which of the following changes will NOT affect the equilibrium constant of a reaction?

Accepted Answer

Addition of a catalyst

Answer

Change in temperature

Answer

Change in pressure

Answer

Change in concentration

Factors Affecting Equilibrium

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