Chemical equilibrium exam questions

Question 1

What is the meaning of the term catalyst and how does it work

Answer 1

1. speeds up the rate of reaction without being used up overall
2. lowers the activation energy by providing an an alternative route for the reaction

Question 2

What will a catalyst do to the rate of attainment of chemical equilibrium?

Answer 2

increase the rate

Question 3

What effect does a catalyst have on the position of equilibrium?

Answer 3

no effect

Question 4

Why does a catalyst have no effect on the position of equilibrium?

Answer 4

1. speeds up the rate of forward and reverse reactions equally
2. at equilibrium

Question 5

What will happen to the amount of yield and position of equilibrium if you increase the temperature in an exothermic reaction?

Answer 5

1. yield decreases
2. an increase in temperature shifts the equilibrium, left, in the endothermic direction,
3. to oppose the increase temperature
   (4. to absorb excess heat energy)

Question 6

State why industry might use a higher temperature than needed for a reaction that requires low temperature for high yield

Answer 6

to increase the rate of reaction

Question 7

State why industry may use a lower pressure than needed

Answer 7

high COST and ENERGY demand of ELECTRICAL pumping

Question 8

what is meant by carbon-neutral

Answer 8

an activity which has no overall carbon emissions to the atmosphere

Question 9

Give the meaning of the term ‘dynamic’ in the context of a dynamic equilibrium

Answer 9

both reactions occur at the same time