unit 1b: kinetics

Question 1

kinetics

Answer 1

the study of the rate of chemical reactions

Question 2

the effect of concentration on rate can be investigated

Answer 2

experimentally

Question 3

powers/indices

Answer 3

known as the orders of reaction e.g. [B]^2

Question 4

how are orders of reaction determined

Answer 4

only through experimental data

Question 5

overall order of a reaction

Answer 5

the sum of the individual orders

Question 6

k

Answer 6

the rate constant, takes account of the effect of other factors such as surface area, temperature etc.

Question 7

units of k

Answer 7

depend on the overall order of the reaction

Question 8

zero order w.r.t. [A]

Answer 8

changing [A] has no effect on rate

Question 9

1st order w.r.t. [A]

Answer 9

doubling [A] doubles rate

Question 10

2nd order w.r.t. [A]

Answer 10

doubling [A] increases rate fourfold

Question 11

units of k for 0 overall order

Answer 11

moll^-1s^-1

Question 12

units of k for 1st overall order

Answer 12

s^-1

Question 13

units of k for 2nd overall order

Answer 13

mol^-1ls^-1

Question 14

units of k for 3rd overall order

Answer 14

mol^-2l^2s^-1

Question 15

the rate of a reaction is dependent on

Answer 15

the slowest step (the rate determining step)

Question 16

reactants involved in the RDS

Answer 16

those which appear in the rate equation

Question 17

the RDS will always occur

Answer 17

first in a reaction mechanism

Question 18

the number of moles of reactant in the RDS is determined by

Answer 18

the reactant orders (powers) in the equation

Question 19

what is meant by order of reaction

Answer 19

the number of molecules involved in the RDS

Question 20

water vapour condensing to a liquid

Answer 20

exothermic but is only spontaneous at low temperatures