A manufacturer uses a solid catalyst to speed up a reaction when making a cleaning product. The catalyst is supplied as cubic particles.
Samples P and Q are made from the same substance.
| Sample | Side length of each particle in nm\text{nm}nm |
|---|---|
| P | 50 |
| Q | 10 |
For a cube with side length xxx:
surface area to volume ratio=6x\displaystyle \text{surface area to volume ratio}=\frac{6}{x}surface area to volume ratio=x6
Equal masses of samples P and Q contain the same total volume of catalyst material.
Calculate the surface area to volume ratio of one catalyst particle in each sample. Give your answers in nm−1\text{nm}^{-1}nm−1.
A mass of 0.20 g of sample Q has a total exposed surface area of 15 m2.
Use your answers to part (a) to calculate the mass of sample P needed to have a total exposed surface area of 15 m2.
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.