12 Rates

Question 1

What is the rate equation?

Answer 1

r=k[A]^x[B]^y

r= moldm-3s-1
K= add all units to eqn and calc
[]=moldm-3

Question 2

Total order of reaction?

Answer 2

Sum of orders of reactants

Question 3

Arrhenius equation: What is it, graphical representation, rearrangement.

Answer 3

k = Ae–Ea/RT
K is the rate constant found in rate eqn.

Graphically, when linearised, ln a is y-int, and gradient is Ea/Rt.

ln k = ln A –Ea /RT

Question 4

Orders of reaction: Effect on rate, rate-determining step, rate equation, graphical representation

Answer 4

0: No effect on rate, not in rate determining step, not in rate equation.
(horizontal line graphically)

1st: proportional, 1mole in rds, [A] in rate equation.
(Direct proportion line graphically)

2nd: X^2 (Where X is multiplier), 2 moles in rds, [B]^2 in rate equation.
(Positive part of Quadratic Graph)