Equillibrium II

Question 1

Define dynamic equilibrium

Answer 1

Occurs when forward and backward reactions are at the same rate, and concentrations of reactants and products stay constant.

Question 2

how do you calculate the moles of reactant at equillibrium?

Answer 2

• initial - reacted moles

Question 3

How do you calculate moles of product at equillibrium?

Answer 3

initial + moles formed

Question 4

Why can the pink colour of phenolphthalein fade after the end-point reaction between ethanoic acid and ethanol?

Answer 4

• addition of NaOH may cause equillibrium to shift towards to the reactants side.

Question 5

What change in conditions would change Kp and Kc?

Answer 5

Temperature ONLY

Question 6

What is the effect of a catalyst on Kc and Kp?

Answer 6

NO EFFECT - speeds up the rate of the forward and backward reactions by the same amount.

Question 7

What is a way to improve atom economy and yield for a reaction?

Answer 7

Recycling the unreacted reactants back into the reactor.

Question 8

Why are industrial processes not in equillibrium?

Answer 8

• because products are removed as they are formed, and they are not in closed systems.

Question 9

What are the conditions needed to have a reaction in dynamic equilibrium?

Answer 9

• closed system
• ## has to be reversible