Rate expression

Question 1

Rate expression

Answer 1

rate=k[A][B]²

k= rate constant

Question 2

Zero order reactant

Answer 2

Change in its concentration does not change rate of reaction;not included in rate expression

Question 3

Example of zero order reactant

Answer 3

Solids(e.g. magnesium)
Pure liquids

We cannot change the concentrations of these

Question 4

First order reactant

Answer 4

Directly proportional i.e.
Doubling its concentration doubles rate of reaction

Question 5

Second order reactant

Answer 5

Increasing concentration by factor x increases rate by factor x²

Question 6

Which catalysts can be included in the rate expression?

Answer 6

Homogenous catalysts (not the solid ones)

Question 7

How to calculate overall order

Answer 7

Add up the orders of the individual reactants

Question 8

What does it mean if rate=k?

Answer 8

O order reaction. None of the reactants affect the rate.

Question 9

Units of k for reaction of overall order 0

Answer 9

mol dm^-3 s^-1

Question 10

Units of k for reaction of overall order 1

Answer 10

sec^-1

Question 11

Units of k for reaction of overall order 2

Answer 11

mol^-1 dm³ s^-1

Question 12

Units of k for reaction of overall order 3

Answer 12

mol^-2 dm⁶ s^-1