A research team tests two samples of the same substance for use in medical imaging. The substance is put into the body before a scan to make different tissues easier to distinguish.
| Sample | Mean particle diameter in nm | Mass required for a usable image in mg | Image-quality score out of 10 | Cost per scan | People reporting adverse effects in a trial of 200 | Longest follow-up period in years |
|---|---|---|---|---|---|---|
| P | 40 | 4 | 8.8 | £22 | 0 | 1 |
| Q | 400 | 24 | 6.1 | £7 | 0 | 10 |
Explain why sample P is a nanoparticulate material and why it can produce a usable image using less material than sample Q.
Evaluate whether sample P should replace sample Q for medical imaging.
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.