La Chateleirs Principle - Condensced Review

Question 1

why does the equilibrium shift towards heat/energy and favor the exothermic reaction when you decrease the temperature of a system

Answer 1

more heat/energy needs to be produced to make up for the loss

Question 2

why does no shift occur when you add a catalyst to an equilibrium

Answer 2

the rates of both the forward and reverse reactions are increased by the same amount

Question 3

what shift occurs when you decrease the pressure of a system

Answer 3

shifts towards the side of the reaction with more moles of gas

Question 4

what shift occurs when you decrease the temperature of a system

Answer 4

shifts towards the heat/energy and the exothermic reaction is favored

Question 5

why does the equilibrium shift towards fewer moles of gas when the pressure of a system is increased

Answer 5

when pressure increases, volume decreases

Question 6

what shift occurs when you increase the temperature of the system

Answer 6

shifts away from the heat/energy and the endothermic reaction is favoured

Question 7

what are the 7 stresses that can occur to an equilibrium

Answer 7

• increase concentration of a substance
• decrease concentration of a substance
• increase pressure of a system
• decrease pressure of a system
• increase temperature of a system
• decrease temperature of a system
• add a catalyst to the system

Question 8

why does the equilibrium shift towards more moles of gas when you decrease the pressure of a system

Answer 8

when pressure decreases, volume increases

Question 9

why does the equilibrium shift away from substance when a substances concentration is increased

Answer 9

extra concentration needs to be used up

Question 10

why does the equilibrium shift towards a substance when the substances concentration is decreased

Answer 10

equilibrium needs to produce more of the substance to make up for what was removed

Question 11

why does the equilibrium shift away from the heat/energy and favor the endothermic reaction when you increase the temperature of a system

Answer 11

extra heat/energy must be used

Question 12

what shift occurs when you decrease the concentration of a substance

Answer 12

shift towards the substance

Question 13

what shift occurs when you increase the concentration of a substance

Answer 13

shift away from the substance

Question 14

what shift occurs when you add a catalyst

Answer 14

no shift occurs

Question 15

what shift occurs when you increase the pressure of a system

Answer 15

shifts towards side of reaction with fewer moles of gas

Question 16

what does a concentration change refer to

Answer 16

when a substance is added or taken away from the equilibrium reaction

Question 17

why does an equilibrium shift

Answer 17

to counteract the change that is imposed, and to eventually establish a new equilibrium

Question 18

what does a spike upwards in only one substance on the graph show

Answer 18

that the concentration of that substance was suddenly increased

Question 19

what does a spike downwards of only one substance on a graph show

Answer 19

that the concentration of a substance was suddenly decreased

Question 20

when the concentration of any species is either increased or decreased does it return back to its initial concentration when equilibrium is reached

Answer 20

no, the concentration never returns to what it originally was even once a new equilibrium is reached