C8.9 - Altering conditions

Question 1

In general, the position of equilibrium does what?

Answer 1

In general, the position of equilibrium shifts as if trying to cancel out any change in conditions

Question 2

When you increase the concentration of a reactant, this will cause the position of equilibrium to do what?

Answer 2

When you increase the concentration of a reactant, this will cause the position of equilibrium to shift to the right, in favour of the products

Question 3

In many reversible reactions, there are what?

Answer 3

In many reversible reactions, there are more molecules of gas on 1 side of the equation than on the other

Question 4

In many reversible reactions, there are more molecules of gas on 1 side of the equation than on the other.
By changing the pressure at which the reaction is carried out, what can you change?

Answer 4

By changing the pressure at which the reaction is carried out, you can change the amount of products that are made

Question 5

If the forward reaction produces more molecules of gas, an increase in pressure does what?

Answer 5

If the forward reaction produces more molecules of gas, an increase in pressure decreases the amounts of products formed

Question 6

If the forward reaction produces fewer molecules of gas, an increase in pressure does what?

Answer 6

If the forward reaction produces fewer molecules of gas, an increase in pressure increases the amount of products formed

Question 7

Brown gas is 2NO2 (g).
Pale yellow gas is N2O4 (g).
If you increase the pressure in the reaction vessel, the position of equilibrium will shift to reduce the pressure
It will move in favour of the reaction that produces fewer gas molecules.
In this case, what would happen?

Answer 7

In this case, that is to the right, in favour of the forward reaction, so:

1. More N2O4 gas will be made
2. The colour of the gaseous mixture will get lighter

Question 8

Changing the pressure affects the equilibrium only if there are what?

Answer 8

Changing the pressure affects the equilibrium only if there are different numbers of molecules of gases on each side of the balanced equation

Question 9

What happens when you have a closed system?

Answer 9

When you have a closed system, no substances are:
1. Added
Or,
2. Taken away
from the reaction mixture

Question 10

When you have a closed system, no substances are added or taken away from the reaction mixture.
In a closed system, what do the relative amounts of the reactants and products in a reversible reaction at equilibrium depend on?

Answer 10

In a closed system, the relative amounts of the:
1. Reactants
2. Products
in a reversible reaction at equilibrium depend on the temperature

Question 11

By changing the temperature, what can you plan to do?

Answer 11

By changing the temperature, you can plan to get:

1. More of the products
2. Less of the reactants

Question 12

If the forward reaction is exothermic, an increase in temperature does what?

Answer 12

If the forward reaction is exothermic, an increase in temperature decreases the amount of products formed

Question 13

If the forward reaction is endothermic, an increase in temperature does what?

Answer 13

If the forward reaction is endothermic, an increase in temperature increases the amount of products formed

Question 14

When you increase the concentration of a reactant, this will cause the position of equilibrium to shift to the right, in favour of the products, in order to do what?

Answer 14

When you increase the concentration of a reactant, this will cause the position of equilibrium to shift to the right, in favour of the products, in order to reduce the concentration of that reactant

Question 15

When you increase the concentration of a reactant, this will cause the position of equilibrium to shift to the right, in favour of the products, in order to reduce the concentration of that reactant.
It opposes what?

Answer 15

It opposes the change that is introduced

Question 16

If the forward reaction produces more molecules of gas, a decrease in pressure does what?

Answer 16

If the forward reaction produces more molecules of gas, a decrease in pressure increases the amounts of products formed

Question 17

If the forward reaction produces fewer molecules of gas, a decrease in pressure does what?

Answer 17

If the forward reaction produces fewer molecules of gas, a decrease in pressure decreases the amount of products formed

Question 18

Changing the pressure affects the equilibrium only if there are different numbers of molecules of gases on each side of the balanced equation
However, increasing the pressure will do what?

Answer 18

Increasing the pressure will speed up both the:
1. Forward
2. Reverse
reactions by the same amount

Question 19

If the forward reaction is exothermic, a decrease in temperature does what?

Answer 19

If the forward reaction is exothermic, a decrease in temperature increases the amount of products formed

Question 20

If the forward reaction is endothermic, a decrease in temperature does what?

Answer 20

If the forward reaction is endothermic, a decrease in temperature decreases the amount of products formed