A student investigates the effect of sucrose concentration on the mass of potato chips.
The table shows the results.
Table
| Concentration of sucrose solution in mol/dm3\text{mol/dm}^3mol/dm3 | Mean percentage change in mass |
|---|---|
| 0.1 | +12.0 |
| 0.3 | +4.0 |
| 0.5 | -4.0 |
| 0.7 | -12.0 |
| 0.9 | -18.0 |
Which statement is correct?
At 0.4 mol/dm30.4\ \text{mol/dm}^30.4 mol/dm3 there is no net movement of water, as the water potentials are equal.
At 0.4 mol/dm30.4\ \text{mol/dm}^30.4 mol/dm3 the potato cells contain no water, so their mass does not change.
At 0.3 mol/dm30.3\ \text{mol/dm}^30.3 mol/dm3 there is no net movement of water, as the water potentials are equal.
At 0.5 mol/dm30.5\ \text{mol/dm}^30.5 mol/dm3 water stops crossing the cell membranes, so the mass decreases.
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.