A medical test uses a small mass of nanoparticles to react with a substance in a sample. A much larger mass of the material used to make the nanoparticles would be needed to produce the same effect if it were in bulk form.
Which property of the nanoparticles makes the small mass effective?
Each nanoparticle is smaller than an individual atom
Their diameters are between 100 nm and 2500 nm
A larger fraction of their atoms is at the surface
Their surface area to volume ratio is lower than that of the bulk material
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.