Chemical Equilibria

Question 1

Dynamic equilibrium?

Answer 1

when forward and reverse reactions take place at the same rate and happen simultaneously

Question 2

Chemical Equilibrium?

Answer 2

A dynamic equilibrium where the rate of the foreword reaction is equal to the rate of the reverse reaction

Question 3

Reversible reaction

Answer 3

When the products can be converted back into the reactants

Question 4

A closed system?

Answer 4

the system is isolated from its surrounding environment in such a way that there is no transfer Of mass into and out. of the system.

Question 5

Open system?

Answer 5

one in which mass or energy can be transferred into or out of the system during a reaction

Question 6

Le Chatelier’s Principle?

Answer 6

When the equilibrium of a closed system ls disturbed, the system will reinstate a new equilibrium that favours the reaction that opposes the disturbance

Question 7

what does it mean if the forward reaction is favored?

Answer 7

rate of the forward reac is greater than the rate of the reverse reac → conC. of substances on the left will decrease and the conc. of substances on the right will increase

equilibrium shifts to the right

Question 8

What does it mean if the reverse reaction favored?

Answer 8

rate of the reverse reaction is greater than the rate of the forward reac → conC. of substances on the right will decrease and the conc. of substances on the left will increase

equilibrium shifts to the left

Question 9

Factors that affect equilibrium position ?

Answer 9

Concentration
teMp
pressure
catalyst

Question 10

effect of changing concentration on equilibrium → discuss a change in corc. of products and reactants

Answer 10

discuss le chatelier and general
> change in concentration
> favoured reaction
> equilibrium direction
> all conc. Increase
> equil restored

Question 11

effect of temp on eqUil ?

Answer 11

+ H value → endothermic
-H value → exothermic

• reverse is opposite

increase temp → endohermic reaction favoured

decrease temp → exothermic reaction favoured

Will move to Stabilize new temp

Question 12

Effect of pressure ON equilibrium

Answer 12

only affects gases

Increase pressure→Equil will move to side with lower number of moles

decrease pressure → Equil moves to side with most number of moles

Question 13

Effect of catalyst on equilibrium?

Answer 13

Increase rate of reverse and forward reactions equally → doesnt affect equilibrium

Equilibrium owy headed sooner IF Catalyst added to a system not already in equilibrium.