A manufacturer is developing a clear coating for glass. The coating should absorb ultraviolet light while allowing visible light to pass through. The manufacturer will only use nanoparticles.
The manufacturer tests three samples of zinc oxide particles.
| Sample | Mean particle diameter in nm | Ultraviolet light absorbed in % | Visible light transmitted in % |
|---|---|---|---|
| P | 40 | 94 | 89 |
| Q | 150 | 97 | 58 |
| R | 80 | 92 | 71 |
Evaluate the suitability of the three samples for the coating.
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.