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Paper 6Alternative to PracticalPractical4 marks
Studying the effect of surface area on diffusion using agar blocks and dye solution.
Results Table
Effect of Surface Area on Diffusion
Agar blocks of different surface areas were placed in dye solution for a fixed time. The depth of dye penetration was measured.
| Surface area (cm²) | Depth of dye penetration (mm) |
|---|---|
| 10 | 5 |
| 20 | 9 |
| 30 | 13 |
- a[1]
State the dependent variable in this investigation.
Aim for approximately 1 distinct marking point.
- b[3]
Explain why increasing surface area affects the rate of diffusion.
Aim for approximately 3 distinct marking points.
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