B How would the students know that a reaction had taken place?
If a reaction had not taken place, the students replaced the disc of filter paper for another
minute. This procedure was repeated for five minutes.
Their results are recorded in the table below.
Time / minutes
Number of new areas
where there had been a
reaction
Total number of areas
where there had been a
reaction
1
14
14
2
28
42
3
18
60
4
12
5
6

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