Reactivity 2.3

Question 1

Equilibrium law formula

Answer 1

k = [products] / [reactants]

Question 2

K

Answer 2

Equilibrium constant

Question 3

Equilibrium constant value high value

Answer 3

Reaction has virtually gone to completion and concentration of reactants in the equilibrium mixture is very small

Question 4

Equilibrium constant value small value

Answer 4

Reaction has hardly proceeded and the concentration of the product will be very small

Question 5

Equilibrium constant is in the region of 1 (between 10^-2 or 10^2)

Answer 5

Equal amounts of reactants and products in the equilibrium mixture

Question 6

Equilibrium constant for the reverse reactions

Answer 6

Reciprocal of equilibrium constant

Question 7

Multi-step reaction value for Kc

Answer 7

K = K1 x K2 x K3

Question 8

Le Chatelier’s Principle

Answer 8

Explains how a system that is in equilibrium is subjected to a small change shifts equilibrium so that the effect is minimised

Question 9

Factors affecting position of equilibrium

Answer 9

• Change of concentration
• Change of pressure
• Change in temperature

Question 10

What effect does adding a catalyst have a position of equilibrium?

Answer 10

No effect but equilibrium will be reached faster

Question 11

Move the position of equilibrium in the forward direction

Answer 11

Decrease the concentration of one or more products or increase the concentration of one or more reactants

Question 12

Industrial process…

Answer 12

Product is removed as it forms. Equilibrium is continuously pulled to the right.

Question 13

When were there be no overall volume change in change in pressure?

Answer 13

When mole ratio is equal

Question 14

What is product in an exothermic reaction?

Answer 14

Heat

Question 15

Lowering temp in exothermic reaction

Answer 15

Move equilibrium to the product side (endothermic direction)

Question 16

Increasing temp in endothermic reaction

Answer 16

Shift position of equilibrium to the product side (exothermic direction)

Question 17

Exothermic reactions temp/K

Answer 17

Higher the temp, lower the K

Question 18

Endothermic reactions temp/K

Answer 18

Higher the temp, greater the K

Question 19

Heterogenous equilibria

Answer 19

When one or more reactants or products are in different phases.

Question 20

Equilibrium expression

Answer 20

Involves concetration of reactions and products at equilibrium

Question 21

Reaction quotient

Answer 21

Derived from actual values of concentration when reaction is not at equilibrium

Question 22

If Q>K

Answer 22

Reaction proceeds to the left in favour of reactants

Question 23

If Q=K

Answer 23

At equilibrium, G=0

Question 24

If Q<K

Answer 24

Reaction proceeds to the right in favour of products

Question 25

If K=1, G=

Answer 25

Zero, at equilibrium

Question 26

If K»1, G=

Answer 26

Negative, equilibrium favours products

Question 27

If K«1, G=

Answer 27

Positive, equilibrium favours reactants