Equilibrium & Le Chatelier's Principle

Question 1

What is a catalyst?

Answer 1

A catalyst
. A substance that INCREASES THE RATE OF CHEMICAL without being used up in the process
. Different reactions need different catalyst
. Eg Iron is used as a catalyst in the manufacturing of Ammonia

Question 2

Name a chemical catalyst

Answer 2

A chemical catalyst is IRON

Question 3

What are Reversible Reactions?

Answer 3

In REVERSIBLE REACTIONS the products can react to produce the original REACTANTS
eg

Ammonia Chloride = ammonia + hydrogen chloride

Question 4

What is the Equilibrium?

Answer 4

During a reversible reaction -

EQUILIBRIUM is when the:

RATE OF THE FORWARD REACTION is equal to the rate of the BACKWARD REACTION

Question 5

What does Le Chatelier’s Principle state?

Answer 5

Le Chatelier’s Principle state that if:

EQUILIBRIUM (balance) is subjected to a change in CONDITIONS the system shifts to resist the change.

eg If an EXOTHERMIC reaction

If temp is raised the yield decreases
if temp is lowered the yield increases

eg if an ENDOTHERMIC reaction

Question 6

Why do manufacturers want to use catalysts?

Answer 6

Catalysts speed up reactions to reduce the amount of energy needed and this saves time & money