Reversible reactions and dynamic equilibrium

Question 1

Reversible reactions:

Answer 1

When the products of the reaction can react to produce the original reactants

Question 2

How do you change the direction of a reversible reaction?

Answer 2

by changing the conditions (e.g. for forwards reaction use hot conditions and for reverse use cool)

Question 3

Rules for reversible reactions:

Answer 3

• if a reversible reaction is endothermic one way, it is exerthermic the opposite direction
• the same amount of energy is trasnferred each way (just for one the energy will be lost and for the other the same amount will be gained)

Question 4

Equilibrium:

Answer 4

If a reversible reaction happens in a closed system, a dynamic equilibrium is reached. The rate of forwards reactions equals the rate of backward reaction

Question 5

What is a closed system?

Answer 5

A system where reactants and products can neither be added or removed

Question 6

What is a closed system?

Answer 6

A system where reactants and products can neither be added or removed

Question 7

What does decreasing the temperature of a reaction at equilibrium do?

Answer 7

The position of equilibrium will shift in the exothermic direction
- this results in an increase in the products of the exothermic reaction and the decrease of the products in the endothermic reaction

Question 8

What does increasing the temperature of a reaction at equilibrium do?

Answer 8

The position of equilibrium will shift in the endothermic direction
- this results in an increase in the products of the endothermic reaction and the decrease of the products in the exothermic reaction

Question 9

What does increasing the pressure of a reaction at equilibrium do?

Answer 9

The position of equilibrium will shift to favour the reaction that produces the fewest gas molecules

Question 10

What does decreasing the pressure of a reaction at equilibrium do?

Answer 10

The position of equilibrium will shift towards the side of the reaction that produces the most gas molecules

Question 11

What does increasing the concentration of a reactant at equilibrium do?

Answer 11

• Shift the position of equilibrium towards the products
• Favours the forward reaction

Question 12

What does increasing the concentration of a product at equilibrium do?

Answer 12

• Shift the position of the equilibrium towards the reactants
• Favours the backward reaction