Chemical equilibrium

Question 1

V2O5

Answer 1

Catalyst

Question 2

Factors affect Kc

Answer 2

Temperature - When equilibrium is re-established, the value of Kc remains the same. Kc does not change
because all reactant and product concentrations change, resulting in the same ratio.

Question 3

Equilibrium constant

Answer 3

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 4

Dynamic equilibrium

Answer 4

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 5

Closed system

Answer 5

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

Question 6

Open system

Answer 6

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

Question 7

Reversible reaction

Answer 7

One in which products can be converted back into reactants.

Question 8

Le Chatelier’s principle

Answer 8

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 9

Yield

Answer 9

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

Question 10

Industrial process

Answer 10

the conditions chosen are those that are the most economically viable and that yield may be sacrificed for rate