A scientist analyses particles trapped by an air filter. The table gives the diameter of two particles and the approximate diameter of one atom.
| Object | Diameter |
|---|---|
| one atom | 0.1 nm0.1\ \text{nm}0.1 nm |
| particle P | 3.6 × 10-8 m |
| particle Q | 6.0 × 10-6 m |
Assume that atoms touch along a straight line through the centre of P.
Calculate the approximate number of atoms that fit across the diameter of P.
Explain whether P is typical of a nanostructure. In your answer, give the size range studied in nanoscience and refer to the number of atoms across P.
Explain why Q can be described as dust.
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.