Reversible reactions

Question 1

Le Chatelier’s principle

Answer 1

When a system at equilibrium is subjected to a change, the system, reacts as to oppose the chance

Question 2

Factors affecting equilibrium

Answer 2

Concentration, temperature, pressure and catalyst

Question 3

Changing concentration (reversible reaction)

Answer 3

N2 + 3H2 = 2NH3

• If I add more N2, reactions tries to remove the N2 and the reaction goes right
• If I add NH3 then the reaction goes to the left

Question 4

Changing temperature (reversible reaction)

Answer 4

• If I make reaction hotter, the reaction tries to remove heat and the reaction goes to the left (endothermic)
• If I make reaction colder, the reaction tried to add heat thus going to the right (exothermic)

Question 5

Changing pressure (reversible reaction)

Answer 5

• If I increase the pressure, reaction tries to decrease the pressure and goes to the side with fewer molecules (usually the right)
• If I decrease the pressure then the reaction tries to increase it, so it goes to the side with more molecules (the left)

Question 6

What happens if you add a catalyst to reversible reaction

Answer 6

-Catalysts speed up reversible reactions both forwards and backwards, they don’t change the position of equilibrium, it is just reached faster