Features and examples of chemical equilibrium

Question 1

What are the four features of a system at equilibrium?

Answer 1

Rate of the forward reaction is equal to the rate of the backward reaction
Concentration of reactants and products remains constant, but is constantly moving
Systems are isolated
Macroscopic properties remain constant

Question 2

Is it true that the temperature and pressure do not change in chemical equilibrium?

Answer 2

Yes

Question 3

Is it true the system can interchange materials with the surroundings?

Answer 3

No

Question 4

Is it true that the chemical system is effectively isolated from the environment?

Answer 4

Yes

Question 5

Is it true that there are an equal number of moles of reactants and products?

Answer 5

No

Question 6

Is it true that the number of moles of reactants and products are different but remain constant over time?

Answer 6

Yes

Question 7

Is it true that the reactants are being depleted at the same rate as products are made?

Answer 7

Yes

Question 8

What are the two types of equilibrium systems?

Answer 8

Heterogeneous equilibrium
Homogeneous equilibrium

Question 9

What is heterogeneous equilibrium?

Answer 9

Reactants and products are in different phases (states)

Question 10

What is an example of heterogeneous equilibrium?

Answer 10

CaCO3 (s) ⇋ CaO (s) + CO2 (g)

Question 11

What is homogeneous equilibrium?

Answer 11

Reactants and products are in the same phase (state)

Question 12

What is an example of homogeneous equilibrium?

Answer 12

3H2 (g) + N2 (g) ⇋ 2NH3 (g)