Chapter 6 - Equilibria

Question 1

what is a reversible reaction and how it is represented

Answer 1

a reaction in which the products are turned into the reactants and the reactants can be turned back into the products
a double arrow is used to represent one

Question 2

state the conditions of a reaction in dynamic equilibrium

Answer 2

the rates of the forward and backward reactions are the same
the concentration of the reactants and the products stays constant
the reaction occurs in a closed system

Question 3

state Le Chatelier’s principle

Answer 3

If a system at equilibrium is subjected to a change, the position of equilibrium will shift to counteract said change

Question 4

what changes will affect the position of equilibrium

Answer 4

temperature
pressure
concentration

Question 5

state the effect on the yield of the products of increasing the temperature of a reaction in equilibrium
(endo and exo)

Answer 5

endo: temp up, yield up
exo: temp up, yield down

Question 6

state the effect on the yield of the products of increasing the pressure of a reaction in equilibrium

Answer 6

if more moles on products side, yield decreases
if more moles on reactants side, yield increases

Question 7

how does using a catalyst affect the position of eqilibrium

Answer 7

it doesnt, only changes the rates of reaction

Question 8

how to calculate Kc for
aA + bB —-> cC + dD

Answer 8

[C]^c + [D]^d / [A]^a + [B]^b
conc of products / conc of reactants

Question 9

how will changing temp, press, or conc affect Kc

Answer 9

only temp will affect Kc
in an endo reaction, change and Kc directly proportional
in an exo reaction, change and Kc inversely proportional