Topic 7 - Equilibrium

Question 1

Closed system

Answer 1

A system in which neither matter nor energy can be lost or gained.
An equilibrium can never occur in a system that is not closed.

Question 2

Equilibrium constant

Answer 2

For a reaction aA + bB -> cC + dD
small letters = coefficients
capital letters = reactants

equilibrium constant =[C]c[D]d/[A]a[B]b.
Variable units.

Question 3

Dynamic Equilibrium

Answer 3

An equilibrium where rates of the forward and reverse reactions are equal

Question 4

Le Chatelier’s principle

Answer 4

If an equilibrium is subjected to a stress

The equilibrium will shift to minimize the effect of the stress.

Question 5

Phase equilibrium

Answer 5

When the rate of vaporization = the rate of condensation