A safety badge contains a sensor made from a metal oxide. The electrical signal from the metal oxide changes when chlorine gas reaches it. Chlorine gas is harmful.
The same mass of metal oxide can be used as nanoparticles or as fine particles.
Explain why a sensor made using nanoparticles responds more quickly than a sensor made using fine particles.
The nanoparticle sensor can be made small enough to attach to a worker's clothing.
Suggest why this is an advantage.
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.