C5.3

Question 1

What is a reversible reaction?

Answer 1

This where products can react to produce original reactant.

Question 2

What are the features of a dynamic equilibrium?

Answer 2

Dynamic equilibrium only happens in a closed system.
The rate of the forward and the rate of the backward reaction are equal.
The concentration of all the reacting substances remain constant.

Question 3

What is Ley Chatelier’s Principle?

Answer 3

If a change is made to a system in equilibrium, the system responds to counteract that change.

Question 4

What happens if the concentration of the reactant is increased?

Answer 4

The position of the equilibrium shift towards the product (right). More product is produced. This will happen until equilibrium is reached again.

Question 5

What will happen if the concentration of product is increased?

Answer 5

Position of the equilibrium will shift towards the reactant (left). More reactant is produced. This will happen until equilibrium is reached again.

Question 6

What will happen if the pressure increased?

Answer 6

An increase in pressure will favour the reaction producing fewer gaseous moles.
If a reaction has more gaseous moles on the product side then an increase in pressure decreases the yield of the reaction.
Equilibrium shift towards the reactants (left).

Question 7

What happens to the equilibrium when temperature is increased.

Answer 7

If the temperature is increase, the equilibrium position moves in the direction of the endothermic change.

Question 8

What happens to the equilibrium position when temperature is decreased.

Answer 8

If the temperature is decreased, the equilibrium position moves in the direction of the exothermic change.

Question 9

How to identify symbols for exothermic and endothermic.

Answer 9

Exothermic symbol = - (negative)

Endothermic symbol = + (positive)