The effect of changes in conditions on equilibrium composition

Question 1

as long as the conditions stay the same, the composition of the reaction mixture will ………………..once equilibrium has been reached

Answer 1

not change

Question 2

when a change in condition is made, then we are said to be

Answer 2

changing the position of equilibrium

Question 3

we can change conditions by: (4 catalysts)

Answer 3

• adding or removing a component
• changing the temperature
• changing the pressure
• using a catalyst

Question 4

if we increase the concentration of one of the reactants in a system in equilibrium, the rate of the forward reaction will………………..and more………………………………..

Answer 4

increase and more products will form

Question 5

as the concentration of the products increase, the rate of the backwards reaction also increases and eventually a new…………………..is established

Answer 5

a new equilibrium

Question 6

if the concentration of a reactant is increased, then the position of equilibrium will shift

Answer 6

to the right

Question 7

if the concentration of a reactant is decreased then the position of equilibrium shifts

Answer 7

left

Question 8

if you increase the concentration of a product in a system in equilibrium, then the equilibrium shifts

Answer 8

left

Question 9

if the concentration of a product is decreased, the equilibrium shifts

Answer 9

right

Question 10

the effect of changing pressure only affects ……………reaction involving……………..

Answer 10

reversible reactions involving gases

Question 11

at a given temperature, the pressure of a gaseous mixture depends solely on

Answer 11

the number of gas molecules in a given volume

Question 12

the pressure of a gaseous can be changed by: (4 items)

Answer 12

• increasing the volume
• decreasing the volume
• increasing the number of gas molecules (more moles)
• decreasing the number of gas molecules (fewer moles)

Question 13

the effect of changing pressure can be studies using

Answer 13

a gas syringe

Question 14

if the number of moles of reactant per given volume is greater and the pressure is increased, and the number of moles of product is less, then the position of equilibrium shifts to the

Answer 14

right

Question 15

if the number of moles of reactant per given volume is less and the pressure is increased, and the number of moles of product is greater, then the position of equilibrium shifts to the

Answer 15

left

Question 16

if the number of moles of reactant per given volume is greater and the pressure is decreased, and the number of moles of product is less, then the position of equilibrium shifts to the

Answer 16

left

Question 17

if the number of moles of reactant per given volume is less and the pressure is decreased, and the number of moles of product is greater, then the position of equilibrium shifts to the

Answer 17

right

Question 18

if the pressure for the following reaction is increased, then the equilibrium shifts to the…………
N2 + 3H2 ⇌ 2NH3

Answer 18

right so more ammonia is produced

Question 19

if the temperature of an equilibrium mixture is raised, then

Answer 19

the rates of both the forward and the backward reactions will increase

Question 20

if temperature is increased, the rate of the endothermic reaction will be………………..than the increase in the rate of the exothermic reaction

Answer 20

greater

Question 21

when the temperature is increased, and the forward reaction is exothermic, the equilibrium change is to the

Answer 21

left

Question 22

when the temperature is decreased, and the forward reaction is exothermic, the equilibrium change is to the

Answer 22

right

Question 23

when the temperature is increased, and the forward reaction is endothermic, the equilibrium change is to the

Answer 23

right

Question 24

when the temperature is decreased, and the forward reaction is endothermic, the equilibrium change is to the

Answer 24

left

Question 25

if a catalyst is added to a reaction mixture that is in equilibrium, the rate of

Answer 25

both the forward and backward reactions will increase

Question 26

when adding a catalyst the increase in rate is

Answer 26

the SAME for both reactions, the position of equilibrium is not altered

Question 27

adding a catalyst at the beginning of a reaction will reduce the time needed to establish

Answer 27

equilibrium