Rates of reaction
Lesson 1
12.1 Rates of reaction
Worksheet 12.1.2
Following the rate of a reaction – presenting and
considering evidence
This worksheet sheet is a continuation of worksheet 12.1.1.
Presenting results
Plot a line graph of your results.
Draw a smooth curve. Do not join up all the points.
Considering evidence
1 Give the volume of hydrogen made in the first 30 seconds. __________ cm3
2 Give the volume of hydrogen made by the end of the reaction. _______ cm3
3 When was the reaction fastest – at the beginning, middle or end? Explain
how your graph shows this.
______________________________________________________________
4 After how many seconds did the reaction stop? Explain how your graph
shows this.
______________________________________________________________
5 Which of the reasons below might explain why the reaction slowed down?
Give a reason for your choice.
a As time went on, there was less and less magnesium.
b As time went on, there was less and less acid.
c The reaction is exothermic, so as time went on the reaction mixture got
hotter.
___________________________________________________________
___________________________________________________________
© Oxford University Press 2013: this may be reproduced for class use solely for the purchaser’s institute
1