Nanoparticles of a substance are used to remove a dissolved pollutant from water. The pollutant reacts with the substance only at the surface of the particles.
Scientists tested cubic particles of the substance. Each test removed the same mass of pollutant in the same time.
| Side length of particles in nm | Minimum mass of particles needed in mg |
|---|---|
| 80 | 24 |
| 40 | 12 |
| 20 | 6 |
The scientists then use particles with a side length of 10 nm.
Predict the minimum mass of these particles needed to remove the same mass of pollutant in the same time.
Explain your answer.
104 exam-style questions on AQA GCSE Chemistry 2.4 Bulk and surface properties of matter including nanoparticles, covering 2.4.1 Sizes of particles and their properties and 2.4.2 Uses of nanoparticles. Each one has a worked solution and a mark scheme showing where the marks go.