A factory transfers the same mass of nanoparticles each hour. Two arrangements are tested. Air samples are taken next to the worker.
| Arrangement | Transfer method | Mean airborne nanoparticle concentration (μg m⁻³) |
|---|---|---|
| A | Nanoparticles are poured into an open container | 36 |
| B | Nanoparticles are moved through a sealed pipe | 3.0 |
Compare the two arrangements and explain which should be used to reduce the possible health risk to workers.
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.