4.6.2 Equilibrium (will come up)

Question 1

What is a reversible reaction

Answer 1

A reversible reaction occurs when the products of a reaction can react backwards to produce the original reactants

Question 2

When is dynamic equilibrium reached

Answer 2

In a closed system, when the forward and reverse reactions occur at the same rate and the concentrations of reactants and products remain constant

Question 3

Describe Le Chatelier’s Principle

Answer 3

If a system is at equilibrium and a change is made to any of the conditions, then the system responds to counteract change and restore the equilibrium

Question 4

Describe the effect of changing the concentration of reactant and product on the position of the equilibrium

Answer 4

If the concentration of one of the reactants or products is changed, the system is no longer at equilibrium and the concs of the substances will change until equilibrium is reached again

If the concentration of a reactant is increased, more products will be formed until equilibrium is reached again
If the conc of a product is decreased, more reactants will react until equilibrium is reached again

Question 5

Describe the effect of changing temperature on the position of equilibrium

Answer 5

If the temperature of a system is increases
The relative amount of products at equilibrium increases for an endothermic reaction
The relative amount of products at equilibrium decreased for an exothermic reaction

Question 6

Describe the effect of changing pressure on the position of the equilibrium

Answer 6

An increase in pressure causes the equilibrium to shift towards the side with the smaller number of molecules
A decrease in pressure causes the equilibrium to shift towards the side with the larger number of molecules
Pressure has no effect on reactions where the number of gas molecules on each side is equal

Question 7

Describe the effect of a catalyst on the position of the equilibrium

Answer 7

No effect

It just speeds up both forward and backward reactions equally