5.1.1: Orders, rate equations and rate constants

Question 1

Reactions only proceed when successful collision occur What this?

Answer 1

• Particles must collide with the correct orientation and with enough energy to overcome the activation energy.
• How frequently these reactions occur will determine the rate of a reaction.

Question 2

Define rate of reaction .

Answer 2

The change in concentration of a reactant or a product per unit time.
ROR= change in conc. /time

Question 3

if the order is zero with respect to reactant A…

Answer 3

Rate =k[A]^0

-The rate is unaffected by changing the concentration of A.

Question 4

if the order is 1 with respect to reactant B…

Answer 4

Rate =k[B]^1

• If [B] increases by 2, the rate also increases by 2 times.
• If [B] increases by 3 times, the rate also increases by 3 time.

Question 5

if the order is 2 with respect to reactant C…

Answer 5

Rate=k[C]^2

• If [C] increases by 2 times, the rate increases by 2^2=4 times.
• If [C] increases by 3 times, the rate increases by 3^2=9 times.

Question 6

Why do zero order reactants not appear in a rate equation?

Answer 6

Because they have no effect in the rate of an equation.

Question 7

What is the overall order of a reaction?

Answer 7

The sum of the individual orders.