Equillibrium

Question 1

When a chemical equilibrium is established..

Answer 1

Both the reactants and the products are present at all times
The equilibrium can be approached from either sides
The reaction is dynamic
The concentration of reactants and products remain constant

Question 2

At a constant temp the calculation would be

Answer 2

[C] c [D]^d / [A]^a [B]^b = a constant

Question 3

What is the value of kc (constant) affected by

Answer 3

Change of temperature nothing else

Question 4

Equilibrium mixture

Answer 4

Mixture of reactants and products in which the proportions of the components remain constant

Question 5

Kc

Answer 5

Represents the relationship between products and reactants of a reaction at equilibrium

Question 6

What equilibrium contsants should require

Answer 6

1) requires a homogeneous reaction where products and reactants are in the same physical state
2)you do not include solids
3)the units may be different for each reaction
4)kc varies with temperature but not icncentrarion or pressure

Question 7

A value of kc less than 1

Answer 7

Equilibrium position is towards reactants the smaller the value of kc the further it lies on the left

Question 8

A kc value of 1

Answer 8

Equilibrium shifts position half way between reactants and products

Question 9

A kc value more than 1

Answer 9

Equilibrium position towards products
The larger the value of kc the further it lies to the right

Question 10

Temp inc
Subsystem oppose
Endo
Yield ammonia decreases

Question 11

calculating moles at equilibrium

Answer 11

moles of reactants at equilibrium = initial moles - reacted moles

Question 12

calculations involving kc

Answer 12

1)construct the balanced equation including state symbols
2)determine the number of moles of each species at equilibrium
3)divide moles by volume to get the equilibrium concentrations in mol dm-3
4)from the equation constructed in the first step write out an expression for kc
5)subsiritue values from third step and calculate the value of Kc with any units

Question 13

what is a homogenous reaction

Question 14

CHANGING THE TEMP ON KC

Answer 14

-changes value of kc
-as the equillibrium consentrations of the prodicts and recatants change
-if you get more products kc rises if you get less product kc decreases

Question 15

increasing temp in in exo

Answer 15

decreases ewuillibrium constant