Uses of nanoparticles — AQA GCSE Chemistry
Test yourself on Uses of nanoparticles with AQA GCSE practice questions.
7 days Premium · Then free forever · No card, no charge
Uses of nanoparticles explained
Nanoparticles are particles between about 1 nm and 100 nm across, so they have a very large surface area to volume ratio.
Read the full explanation
This gives nanoparticulate materials useful properties: they can be effective catalysts, they can carry tiny amounts of a substance into the body, and they can give smooth, lightweight coatings. Students should weigh these benefits against drawbacks such as possible toxicity, unknown long-term effects and the difficulty of disposing of them safely. For example, a sunscreen containing titanium dioxide nanoparticles spreads easily and gives good protection, but the particles may enter cells and their long-term effect is uncertain. You are not required to recall extra examples or properties beyond those taught; instead, use the information given in a question to judge whether a use is worthwhile.
Your focus
- Describe at least one advantage and one disadvantage of using a nanoparticulate material for a given application.
- Use supplied information to judge whether a nanoparticle use is suitable for a stated purpose.
- Explain how the large surface area to volume ratio of nanoparticles produces both useful effects and possible risks.
Uses of nanoparticles exam tips
Marking Points
- State that nanoparticles have a very large surface area to volume ratio, which makes them effective catalysts and allows small quantities to have a large effect.
- Describe a benefit of a named application, such as improved coverage, lower mass or more efficient delivery of a substance.
- Describe a disadvantage, such as possible toxicity, unknown long-term health effects or environmental harm.
- Use information supplied in the question to reach a justified judgement about whether a particular use is suitable for the stated purpose.
- Recognise that the same property, such as small size, can be both an advantage and a disadvantage depending on the application.
Examiner Tips
- 💡Read the purpose stated in the question and link each advantage or disadvantage directly to that purpose rather than listing general facts.
- 💡Use comparative language such as more effective, less mass or greater risk to make the weighing of evidence clear.
- 💡Finish with a short judgement that follows from the points you made, for example that the benefit outweighs the risk for this use.
Common Mistakes
- Treating all nanoparticles as automatically harmful; the correct approach is to weigh evidence for the specific use rather than assume a general danger.
- Confusing nanoparticles with atoms or molecules; nanoparticles are much larger than individual atoms and contain many atoms, so descriptions should refer to particles in the 1 nm to 100 nm range.
- Giving only advantages or only disadvantages when the question asks for a balanced consideration; the correction is to include at least one point on each side before judging.