Chemical Equilibrium

Question 1

What is a reversible reaction

Answer 1

• Low activation energy

- does not go to completion

Question 2

What is macroscopic properties

Answer 2

Colour
Pressure
Temperature

Question 3

What is an equilibrium constant

Answer 3

Gives numerical value relating conc of all species at equilibrium

Question 4

What does a large value of Kc apply?

Answer 4

That equilibrium favours products

Question 5

What does a small value of Kc apply?

Answer 5

That equilibrium favours reactants

Question 6

What is favoured if value of Kc is close to 1?

Answer 6

Neither products or reactants

Question 7

Imposed changes that will effect equilibrium

Answer 7

Concentration
Total pressure
Temperature

Question 8

What happens if the conc of a reactant has been increased

Answer 8

• Be an increase in rate of forward reaction - meaning there is an increase in rate of collisions between reacting particles

Question 9

Why does the increase of conc of a reactant lead to a reduction in the conc of the reactant

Answer 9

As they are temporarily used up faster than they are produced

Question 10

If there is an increase on volume that means there is

Answer 10

A decrease in pressure

Question 11

If there is a decrease in volume that means there’s an

Answer 11

Increase in pressure

Question 12

If a change in pressure is imposed on a closed system then the system can return to equilibrium by

Answer 12

Altering the total moles of the gas present

Question 13

Increase in pressure inside system will favour

Answer 13

Side of reaction with few moles and it has less pressure in the system this PCIC (partially counteracting imposed change)

Question 14

If decrease in pressure system will favour

Answer 14

Side of equilibrium reaction with greater moles as more pressure this PCIC

Question 15

If both sides of a system with an imposed change have the same amount of miles on each side this means

Answer 15

Change in pressure has no effect on equilibrium position

Question 16

If temp is increased then a new equilibrium is establish by

Answer 16

Favouring the exothermic process

Question 17

Exothermic process if temp increased nee equilibrium is establisged as the -lcp temp change

Answer 17

System converts so of the added heat to chemical potential energy causing temp to decrease

Question 18

If temp is decreased, new equilibrium is established by

Answer 18

Favouring the exothermic process

Question 19

Exothermic process

Answer 19

System comverts chemical potential energy to heat therefore the temp rises

Question 20

Exothermic reactions are more sensitive to

Answer 20

Temp than exothermic

Question 21

Exothermic reaction Kc decreases as

Answer 21

Temp increases

Question 22

Endothermic reaction Kc increase as

Answer 22

Temp increases

Question 23

Other alterations

Answer 23

Catalyst
Speeds up rate of attainment of equilibrium
Increases rate of forward and reverse reaction