18.2 Concentration-time Graphs

Question 1

How to do continuous monitoring

Answer 1

1. Gas collection
2. Mass lost
3. Colour changes using colorimeter

Question 2

Zero order concentration time graph

Answer 2

Straight line downwards

Question 3

First order concentration time graph

Answer 3

Downward curve

Question 4

What is the gradient in concentration time graph zero order

Answer 4

k

Question 5

Second order concentration time graph

Answer 5

Downward curve which is steeper at the start and tails off slowly

Question 6

Gradient of a concentration time graph =

Answer 6

The rate of reaction

Question 7

Half life

Answer 7

Time taken for half a reactant to be consumed

Question 8

Two methods for calculating k

Answer 8

Rate constant from tangent method
Rate constant from half life

Question 9

Reaction constant equation with half life

Answer 9

k= ln2/t 1/2