Chem U3AOS2

When a no. of product particle vs. time graph platoes it is because…?

The limiting reagent is completely consumed

What is the Kc or the Equilibrium constant?

a ratio of reactants and products in a reversible reaction at a specific temperature and only occurs at equilibrium

What is the Qc or the Reaction Quotient and what is it used for?

Is used to compare the concentrations of products and reactants at any point in the reaction to the Kc

What is dynamic equilibrium? X5 other disclaimers

when the rate of the forwards and backwards reactions are equal\

• the amount/concentration of chemical substances (R and P) remains constant

• the temperature remains constant

• the reaction is incomplete

• MUST be a closed system

• dynamic = the system doesn’t stop reacting just produces at the same rate of consumption

If Kc > 10^4 what does this tell us about the equilibrium?

• High extent of the reaction in terms i.e close to completion

• High yield of the reaction i.e high amounts of the desired product is produced

If Kc < 10^- 4 what does this tell us about the equilibrium?

• Low extent of the reaction in terms i.e not close to completion

• Low yield of the reaction i.e little of the desired product is produced

What is the purpose of the equilibrium constant?

The extent of the reaction, how far the reaction proceeds before equilibrium is reached

• the extent of the reaction in terms of how close to completion

• the yield of the reaction how much of the desired product is produced

If the Qc > Kc what can be interpreted?

There is a higher concentration of products to reactants and the reverse reaction will be favoured / shift to the left to reach equilibrium

If the Qc < Kc what can be interpreted?

There is a lower concentration of products to reactants and the forwards reaction will be favoured / shift to the right to reach equilibrium