A manufacturer makes sports socks containing silver nanoparticles. The socks are washed repeatedly.
Which statements help to explain why the possible effects of this product on the environment should be investigated?
Statement 1: Silver nanoparticles washed out of the socks could reach soil and water.
Statement 2: The nanoparticles have a smaller surface area to volume ratio than a lump of silver.
Statement 3: Silver nanoparticles could harm useful bacteria in soil and water.
Statement 4: Silver nanoparticles are larger than grains of dust or sand.
1 and 3 only
2 and 4 only
2 and 3 only
1 and 4 only
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.