Unit 3 Equlibria

Question 1

What is a reversible reaction and what type of reactions are they?

Answer 1

When the reactants form products(forward reaction) while the products are forming the reactants(reverse reaction)

Question 2

Describe the concentration of reactants and products at equilibrium?

Answer 2

The concentration of reactant and products remain constant but not always equal

Question 3

Why can equilibrium only be reached in a closed system?

Answer 3

None of reactents/products are lost

Question 4

Describe the rates. Of the forward and reverse recations?

Answer 4

They take place at equal rates

Question 5

Describe equilibrium thought graphs?

Answer 5

At the start of a reversible reaction there is higher concentration of reactants which results in rate of forward being greater than reverse
As reaction proceeds the concentration of reactants decreases resulting in the rate of forward decreasing
As reaction proceeds the concentration of products increases resulting in rate of reverse reaction increasing
A point is reached where the rate of forward equals reverse

Question 6

What affects the position of equilibrium and what will not affect it?

Answer 6

Changing concentration
Changing temperature
Changing pressure

Catalyst

Question 7

What will happen to a system of eqlibrum is subjected to a change?

Answer 7

The system will adjust itself to counteract the applied change

Question 8

What happens to equilibrium when concentration is increased/decreased?

Answer 8

> conc of reactent shifts equilibrium to right make more product
conc of products shifts equilibrium to left make more reactents

< opposite

Question 9

What happens to equilibrium when pressure is increased/decreased?

Answer 9

> pressure shift’s equilibrium to side with least number of moles of gas

<pressure shifts equilibrium to side with greatest number of moles of gas

Altering pressure does not affect equilibrium when number of moles of gas on product and reactant side are equal

Question 10

What is exothermic and endothermic?

Answer 10

Exothermic gives out engery
Endothermic takes in enegry

Question 11

What happens to equilibrium when increasing/decreasing temp?

Answer 11

> temp shifts equilibrium to the side of the endothermic reaction

<temp shifts the equilibrium to the side of exthoermic reaction