6.1 - Idea of Equilibrium

Question 1

what if the position of equilibrium lies to the left?

Answer 1

the concentration of reactants is higher than that of products

Question 2

What does it mean if the position of equlibrium lies to the right?

Answer 2

the concentration of products is higher than that of reactants

Question 3

Features of a reversible reaction (before, at and before equilibrium):

appearance
rates of forward and backward reaction
appearance of reaction mixture

Answer 3

Question 4

How can the conditions of an equilibrium be disrupted?

Answer 4

altering the;
* pressure
* temperature

Question 5

Features of dynamic equilibrium (4):

Answer 5

1. Equilibrium can only be achieved in aclosed system- this means no substances can enter or leave.
2. The concentrations of reactants and products stayconstantover time (but do not have to be the same as each other).
3. The rates of theforward and backward reactions are equal.
4. The system appears unchanging even though the forward and backward reactions are still occurring - this is why it is called a dynamic equilibrium.

Question 6

How is dynamic equilibrium reached?

Answer 6

1. The forward reaction initially proceeds rapidly as lots of reactants are present.
2. As reactants get used up, the rate of the forward reaction slows down.
3. Meanwhile, more products accumulate, speeding up the backward reaction.
4. Eventually, the rates of the forward and backward reactions become equal.
5. At this point, dynamic equilibrium is established.

Question 7

What are reversible reactions?

Answer 7

• the products can react to reform the original reactants
• H2(g)+ I2(g)⇌ 2HI(g)
  the reaction can proceed in both directions