Silver kills bacteria, so silver is added to some wound dressings. The table gives information about two forms of silver.
Table: The cost for each gram, and the mass needed for each dressing, of two forms of silver
| Form of silver | Cost in £ for each gram | Mass needed for each dressing in g |
|---|---|---|
| Fine particles | 0.60 | 0.50 |
| Nanoparticles | 3.00 | 0.05 |
Which statement about using the nanoparticles instead of the fine particles is correct?
They cost less for each dressing and less for each gram
They cost more for each dressing and more for each gram
They cost less for each dressing but more for each gram
They cost more for each dressing but less for each gram
40 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.