| # of group | Number of disks | Time used (s) | Volume of gas produced (ml) |
| 1 | 5 | 48.2 | 49 |
| 2 | 2 | 28.6 | 60 |
| 3 | 4 | 21.7 | 100 |
| 4 | 8 | 40.8 | 60 |
| 5 | 10 | 37.8 | 130 |
Controlled variables: temperature (room temperature); concentration of hydrogen peroxide; amount of hydrogen peroxide used (5ml of each trial); PH value: 7.
Independent variable: # of disks added to hydrogen peroxide
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