chemical equilibrium

Question 1

chemical equilibrium

Answer 1

a state at which rates of forwards reactions and reverse reactions are equal and the concentrations of the reactants and products remain constant

Question 2

why is equilibrium dynamic

Answer 2

the rate at which reactants become products and vice versa remains constant, and this activity is continuous

Question 3

3 things necessary to establish equilibrium

Answer 3

reversible reaction
closed environment
constant temp

Question 4

equilibrium constant

Answer 4

Keq
not all products will be converted ro reactants, vice versa
products/ reactants
Keq>1 favours forwards
Keq<1 favours reverse
favoured means higher # of moles and concentration
solids or liquids are given value of 1

Question 5

how do you find Keq for reverse reaction

Answer 5

take reciprocal of forwards reaction
ex. Keqf = 280
Keqr = 1/280

Question 6

what is le Chateliers Principle

Answer 6

states that if system at equilibrium is subjected to an external stress, the equilibrium will shift to minimize the effect of that stress

Question 7

what are external stresses that will cause a shift

Answer 7

concentration
pressure
temperature

Question 8

what is a catalyst

Answer 8

speeds up both forwards and reverse reactions, helps reach equilibrium sooner

Question 9

Endothermic and exothermic

Answer 9

endo= heat on reactant side +H
increase temp shift right
decrease temp shift left

exo=heat on product side -H
increase temp shift left
decrease temp shift right

Question 10

change in pressure

Answer 10

increase in pressure shift towards side with fewest moles
decrease in pressure shift towards side with most moles

=moles no change

Question 11

what change in temp favours endo or exo reactions

Answer 11

endo increase reaction in temp
exo reaction decrease in temp