Equilibrium

Question 1

State Le Chatelier’s principle (defo on test!) (L.C)

Answer 1

When a system at equilibrium is subjected to a stress such as a change in temperature, pressure or concentration the system will alter to oppose the effect of the stress.

Question 2

What is meant by chemical equilibrium? (L.C)

Answer 2

A system is said to have reached a state of equilibrium when the rate of the forward reaction equals the rate of the reverse reaction.

Question 3

What is meant by dynamic state? (L.C)

Answer 3

Both the forward and reverse reactions occur at the same time.

Question 4

Le Chatelier’s principle predicts best yields in a certain equilibrium process at low temperatures and high pressures. Suggest a reason why there conditions might not be used industrially. (L.C)

Answer 4

When temperature is too low it gives low rate (slow reaction).
When pressure is too high it is unsafe (costly).

Question 5

Why is a chemical equilibrium described as dynamic? (L.C)

Answer 5

As the reaction has not stopped / reaction continuing

Question 6

Identify one industrial problem associated with the use of high pressures. (L.C)

Answer 6

High building costs / danger of leaks