Chemical equilibrium

Question 1

Equilibrium constant

Answer 1

An expression of the concentration of the products (gasses and solutions only) over the concentration of the reactants (gasses and solutions only) for a reaction that is in equilibrium.

Question 2

Dynamic equilibrium

Answer 2

Reversible reaction in which the forward and the reverse reactions are taking place at the same rate, and hence the concentrations of reactants and products are constant.

Question 3

Closed system

Answer 3

One in which mass is conserved inside the system but energy can enter or leave the system freely.

Question 4

Open system

Answer 4

One in which both energy and matter can be exchanged between the system and its surroundings.

Question 5

Reversible reaction

Answer 5

One in which products can be converted back into products.

Question 6

Le Chatelier’s principle:

Answer 6

When an external stress (change in pressure, temperature or concentration) is applied to a system in dynamic chemical equilibrium, the equilibrium point will change in such a way as to counteract the stress.

Question 7

Yield

Answer 7

A measure of the extent of a reaction, generally measured by comparing the amount of product against the amount of product that is possible.