Ch 7 Equilibrium

Question 1

Dynamic Equilibrium: definition

Answer 1

a state where in a closed system, the concentrations of all the reactants and products is constant

Question 2

Dynamic equilibrium: explanation (5)

Answer 2

• most chemical reactions do not go to completion
• instead, a reverse reaction will take place with the formed products to reform the reactants
• in a closed system, the concentrations of all the reactants of products will eventually become constant
• forward and reverse reactions continue to occur
• at equilibrium, the rates of the forward reaction and the reverse reaction are the same

Question 3

Dynamic equilibrium occurs with physical changes (4)

Answer 3

• e.g. in a closed flask containing some water, equilibrium reached between liquid water and water vapour
• faster moving molecules in the liquid evaporate from the surface to become vapour
• slower moving molecules in the vapour condense to form liquid
• equilibrium established when the rate of vaporization equals the rate of condensation

Question 4

Closed system (2)

Answer 4

• is one which neither matter nor energy can be lost or gained from the system i.e. the macroscopic properties remain constant
• equilibrium would never be reached with an open system as the products could escape

Question 5

reaction quotient Q

wA + xB –>

Answer 5

[C]^y + [D]^z divided by [A]^w + [B]^x