Topic 11: Equilibrium II

Question 1

What is partial pressure?

Answer 1

• the total pressure of a gas mixture is the sum of all the partial pressure of the individual gases

Question 2

What is a mole fraction and its formula?

Answer 2

• the proportion of a gas mixture that is a particular gas

- number of moles of gas / total number of moles of gas in mixture

Question 3

What is partial pressure formula

Answer 3

mole fraction of gas / total pressure of the mixture

Question 4

to find Kp in heterogenenous equilibria, what do you include?

Answer 4

• only include gases

Question 5

Does temperature alter the equilibrium constant?

Answer 5

• yes
• if changing the temp causes less product to form, the equilibrium moves to the left, and the equilibrium constant decreases
• if changing the temperature causes more product to form, the equilibrium moves to the right and the equilibriium constant increases

Question 6

Why does concnetration not affect the Kc at a fixed given temp?

Answer 6

• if the concentration of one thing changes, then the concentration of the other musts change to keep the value of Kc the same

Question 7

Why does pressure not affect the Kc at a fixed given temp?

Answer 7

• increasing the total pressure increases the partial pressure of each of the products and reactants
• the equilibrium shifts to the side with fewer moles of gas to decrease the pressure
• overall effect is that Kp and Kc are unchanged