A student investigates the effect of sugar solution concentration on the mass of potato chips.
The student:
The Table shows the results.
Table
| Concentration of sugar solution in mol/dm3\text{mol/dm}^3mol/dm3 | Mass at start in g\text{g}g | Mass at end in g\text{g}g | Percentage change in mass |
|---|---|---|---|
| 0.0 | 2.50 | 2.80 | |
| 0.2 | 2.40 | 2.52 | +5.0 |
| 0.4 | 2.60 | 2.55 | -1.9 |
| 0.6 | 2.50 | 2.30 | -8.0 |
| 0.8 | 2.45 | 2.18 | -11.0 |
Calculate the percentage change in mass of the chip in the 0.0 mol/dm3 solution.
Explain why the mass of the chip in the 0.8 mol/dm3 solution decreases.
Explain why the student calculates the percentage change in mass and not just the change in mass.
Give one variable the student should keep the same.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.