mod 5 IQ2

Question 1

What does Le Chatelier’s principle state?

Answer 1

When a system in equilibrium is subjected to a change in concentration, temperature, external pressure, or some other factor which upsets the equilibrium, the system reacts in such a way as to counteract that change and achieve a new equilibrium state

Question 2

What happens to a system at equilibrium if you increase pressure

Answer 2

the equilibrium will shift to the side with fewer gaseous moles

Question 3

What happens to a system at equilibrium if you decrease pressure?

Answer 3

equilibrium will shift to the side with more gas particles

Question 4

What happens if you increase the concentration of the reactants?

Answer 4

forward rate of reaction increases and equilibrium shifts to the right

Question 5

What happens to a system at equilibrium if you decrease the concentration of reactant

Answer 5

reverse rate of reaction will increase and equilibrium will shift to the left

Question 6

what happens to a system at equilibrium if you increase the concentration of products?

Answer 6

the rate of reverse reaction increases and equilibrium shifts to the left

Question 7

What happens to a system at equilibrium if you decrease the concentration of the products

Answer 7

rate of forward reaction increases and equilibrium shifts to the right

Question 8

what happens if you increase the temperature of an exothermic reaction at equilibrium?

Answer 8

Reverse reaction is favoured and equilibrium shifts to the left. There is also a decrease in Keq

Question 9

What happens if you decrease the temperature of an exothermic reaction at equilibrium?

Answer 9

forward rate of reaction is favoured and equilibrium shifts to the right. Keq increases.

Question 10

what happens if you increase the temperature of an endothermic reaction at equilibrium

Answer 10

increase in forward rate of reaction and equilibrium shifts to the right. Increase in Keq

Question 11

what happens if you decrease the temperature of an endothermic reaction at equilibrium

Answer 11

increase in reverse rate of reaction and equilibrium shifts to the left. Decrease in Keq

Question 12

What happens if you add a catalyst to a reversible reaction?

Answer 12

Equilibrium will be attained faster.

Question 13

what happens on a graph if there is an increase n concentration or partial pressure of one substance.

Answer 13

sudden increase in one substance

Question 14

what happens on a graph if there is a decrease in concentration or partial pressure of one substance?

Answer 14

sudden decrease in that one substance

Question 15

what happens on a graph if there is a increase in volume/decrease in pressure of a system?

Answer 15

sudden decrease in all gaseous species

Question 16

what happens on a graph if there is a decrease in volume/increase in pressure of system?

Answer 16

sudden increase in all gaseous species

Question 17

what happens on a graph if there is a increase in temperature

Answer 17

no sudden changes, gradual increase in certain species depending on whether the reaction is endothermic or exothermic

Question 18

what happens on a graph if there is a decrease in temperature?

Answer 18

no sudden changes

Question 19

what does the collision theory state:

Answer 19

that reacting substances must collide,
reacting particles must possess the activation energy to result in successful collisions
that they must collide with the correct orientation.

Question 20

what happens to keq when temperature increases in an exothermic reaction

Answer 20

Keq decreases

Question 21

what happens to keq when temperature decreases in an exothermic reaction

Answer 21

Keq increases

Question 22

what happens to Keq when temperature increases for endothermic reaction

Answer 22

Keq increases

Question 23

what happens to keq when you decrease the temperature for an endothermic reaction

Answer 23

Keq decreases

Question 24

what happens on a graph when a catalyst is added

Answer 24

equilibrium is achieved faster and the line is steeper