AC6: Equilibria

Question 1

State the Kc expression

Answer 1

[products] / [reactants]

Question 2

How can you calculate the units of Kc

Answer 2

x = sum of numerator powers - sum of denominator powers
mol^(x)dm^(-3x)

Question 3

What variable affects Kc

Answer 3

temperature - Kc is constant at constant temperature

Question 4

How does the size of Kc tell you the position of the equilibrium

Answer 4

If Kc is small, then equilibrium is towards the LHS
If Kc is large, then equilibrium is towards the RHS

Question 5

State what the mole fraction is

Answer 5

Number of moles of the gas
/
Total number of moles of gas

Question 6

How do you work out the partial pressure of a gas

Answer 6

Mole fraction of the gas x total pressure

Question 7

What is partial pressure

Answer 7

the pressure exerted by a gas in a mixture of gases

Question 8

State the Kp expression

Answer 8

p(products)
/
p(reactants)

Question 9

How do you work out the units of Kp

Answer 9

stoich(num) - stroich(denom) = x
atm^(x)
kPa^(x)
Pa^(x)

Question 10

What variable affects Kp

Answer 10

temperature - Kp is constant at constant temperature