equilibrium 1&2

Question 1

what does dynamic equilibrium mean

Answer 1

the rate of the forward reaction is the same as the rate of the backward reaction in a closed system, and the concentrations of the reactants and products are constant

Question 2

what does it mena if equlinrium lies to the left/right in relation to prducts and reactants

Answer 2

left - when there is more reactants than products in the equilibrium mixture
right - when there is more products than reactants in the equilibrium mixture

Question 3

factors affecting position of equilbrium

Answer 3

• concentration of a component
• pressure of a system
• temperature

Question 4

what does homogenous system mean

Answer 4

homo XD
- all reactants nad products are in the same phase

Question 5

what does heterogenous system mean

Answer 5

at least 2 different phases are present

Question 5

what does a phase mean

Answer 5

• like state but allows liquids that are immersible to be different phases

Question 5

what doe s alarge Kc value mean

Answer 5

the qeuilibrium lies to the right

Question 5

Kc=

Answer 5

• [prodcuts]/[reactants]
• constant, same value at same temperature, unaffected by pressure
  eg. aA + bB —> cC + dD
  so Kc = [C]^c x [D]^d/[A]^a x [B]^b

Question 6

what is Q
ask a teacher perchance xx

Answer 6

mathematical realtionship between concentrations of components in a reaction
q=kc

Question 7

what does a small Kc means <1

Answer 7

equilibrium lies to the left

Question 8

how to calculate Kc

Answer 8

i - initial moles
c - change in moles
e - equilibrium moles
c - concnetration at equlibrium (eq moles/volume)
substitute the concnetrations into the [products]/[reactants] equation

Question 9

what is le chatelier’s prinicple

Answer 9

if a change is made to a system in dynamic equilibrium, the position of the equilibrium moves to counteract this change

Question 10

how does changing temp affect the equilbrium and affect on Kc

Answer 10

• if we increase temperature the equlibrium will shift to the endothermic direction
• if the backwards reaction was endothermic, the denominator of Kc increases therefore Kc decreases
• if the forwards reaction was enfothermic, the numerator of Kc would increase therefore Kc increases

Question 11

how does changing pressure affect the equilbrium

Answer 11

An increase in pressure will cause the equilibrium to move towards the side with the fewest molecules.
A decrease in pressure will cause the equilibrium to move towards the side with the most molecules.

Question 12

how does changing concentration affect the equilbrium and Kc

Answer 12

• equilibrium will move towards the products in order to use up the extra reactant added
• rate of the reaction temporarily increases and the system is no longer in equilibrium
• Kc doesn’t change
• if you incrrease concnetration of product number of Q increase so equlibrium shifts left to increase denominator and restore Q=Kc

Question 13

Kp =

Answer 13

(p Products)/(p Reactants)

Question 14

partial pressure =

Answer 14

mole fraction x total pressure

Question 15

what is mole fraction

Answer 15

moles of individual gas/moles of all gas

Question 16

how does temperature affect Kp

Answer 16

• favours endothermic side
• denominator of Kp Increase thereofre Kp decreases

Question 17

how does change in partial pressure of one gas affect Kp

Answer 17

-ie. change in conc of one gas
- Kp doesn’t change
eg one reactnat increases:
- denominator of Q increases
- equilibrium shifts rigth tot restor Q=Kc

Question 17

how does change in total pressure affect Kp

Answer 17

equlibrum shifts ot side with fewest moles

Question 18

lowkey is there anythign else for Kp xx

Answer 18

tell me !! (wonder girls refrence what >.<)