Scientists are modelling two forms of a nanoparticle catalyst used to speed up the breakdown of an unwanted substance in water.
Each model sample contains the same total volume of catalyst. The particles remain separate, so all six faces of every particle are exposed to the water.
| Form | Side length of each cubic particle in nm | Number of particles |
|---|---|---|
| P | 30 | 1 |
| Q | 15 | 8 |
Equal volumes of water containing the same amount of the unwanted substance are treated under the same conditions.
Calculate the total surface area of each model sample.
Give your answers in nm2\text{nm}^2nm2.
Explain which form of the catalyst is expected to cause the faster breakdown of the unwanted substance.
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.