Silver nanoparticles are added to some sports socks to kill the bacteria that cause odour. Three brands of sock were washed four times and the mass of silver released into the wash water was measured.
| Brand | Mass of silver in a new sock (μg\mu\mathrm{g}μg) | Total silver released in four washes (μg\mu\mathrm{g}μg) |
|---|---|---|
| J | 1360 | 1360 |
| K | 2100 | 105 |
| L | 30 | 22 |
Which conclusion is justified by the data?
Brand L released the least silver, so it lost the smallest percentage of the silver it contained
Brand K contained the most silver, so it released the most silver into the waste water
The data show that the silver released from the socks harms organisms living in rivers
Brand J lost all of its silver within four washes, so its antibacterial effect would not last
36 exam-style questions on Edexcel GCSE Chemistry 10.5 Bulk and surface properties of matter including nanoparticles, covering 10.5.1 Nanoparticles: size, uses and risks and 10.5.2 Comparing and selecting materials. Each one has a worked solution and a mark scheme showing where the marks go.