Scientists are concerned about the possible risks of some nanoparticulate materials.
Which statements help to explain these concerns?
Statement 1: Their large surface area to volume ratio means they could catalyse harmful reactions in the body.
Statement 2: They are small enough to be absorbed into cells.
Statement 3: Their atoms are a different type from the atoms in the bulk material.
Statement 4: Their long-term effects on health and the environment are not yet fully known.
1, 2 and 4 only
1 and 3 only
2 and 4 only
2, 3 and 4 only
60 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.