Reactivity 2.2 HL

Question 1

Molecularity

Answer 1

The number of reactant particles taking part in any specified step

Question 2

Unimolecular

Answer 2

Elementary step involving one reactant particle

Question 3

Bimolecular

Answer 3

Elementary step involving two reactant particles

Question 4

A –> product

Answer 4

Unimolecular, rate = k[A]

Question 5

2A –> product

Answer 5

Bimolecular, rate = k[A]^2

Question 6

A+B –> product

Answer 6

Bimolecular, rate = k[A][B]

Question 7

Activation energy in a single step reaction

Answer 7

Minimum energy required to reach the transition stage before products are formed

Question 8

Activation energy in a two step reaction

Answer 8

Overall Ea is the energy difference between reactants and highest energy transition state

Question 9

Rate determining step is which step?

Answer 9

The slower step, with the highest activation energy

Question 10

Order of reaction with respect to a particular reactant

Answer 10

The power to which its concentration term in the rate equation is raised

Question 11

Overall reaction order

Answer 11

x + y

Question 12

Rate expression is determined how?

Answer 12

Can only be determined experimentally

Question 13

Radioactive decay

Answer 13

Always a first order process

Question 14

Zero order

Answer 14

rate = k
k = mol dm-3 s-1

Question 15

First order

Answer 15

rate = k [A]
k = s-1

Question 16

Second order

Answer 16

rate = k[A]^2 or k[A][B]
k = mol-1 dm3 s-1

Question 17

Third order

Answer 17

rate = k[A]^2 [B] or k[A][B]^2
k = mol-2 dm6 s-1