SC12 - Reversible Reactions and Equilibria ✓

Question 1

SC12a - What is a reversible reaction?

Answer 1

A reaction where the products can react again to reform the reactants

Question 2

SC12a - What symbol would show that a reaction is reversible?

Answer 2

⇌ : The double arrow

Question 3

SC12a - In a reversible reaction how does the speed of the forward reaction and backward reaction change over time?

Answer 3

• The forward reaction starts fast and gets slower over time.
• The backward reaction starts slow and gets faster over time.

Question 4

SC12a - Define Dynamic Equilibrium

Answer 4

When the forward and backward reactions in reversible reaction occur at the same rate.

Question 5

SC12a - What happens to the amount of products and reactants produced once a reaction has reached Dynamic Equilibrium?

Answer 5

They stop changing (increasing or decreasing)

Question 6

SC12a - What is required for Dynamic Equilibrium to be achieved, and why?

Answer 6

• A closed system.
• In an open system fluids can escape and equilibrium cannot be reached

Question 7

SC12a - What is the name and the chemical formula of the process that creates ammonia?

Answer 7

• The Harber Process:
• N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Question 8

SC12a - What is the temperature, pressure and catalyst used during the Harber Process?

Answer 8

• T: 450°
• P: 200 Atmospheres (atm)
• C: Iron Catalyst