AQA · Chemistry · 8462
GCSE Chemistry: Sizes of particles and their properties
Bonding, structure, and the properties of matter · AQA GCSE Chemistry (8462), specification point 4.2.4.1. Cards are generated from the exam board's own specification for "Sizes of particles and their properties", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What size range of structures does nanoscience refer to?
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Structures 1–100 nm in size, of the order of a few hundred atoms.
Nanoparticles are of the order of a few ? atoms in size.
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hundred
What is the diameter range of fine particles (PM2.5)?
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Between 100 nm and 2500 nm (1 × 10⁻⁷ m and 2.5 × 10⁻⁶ m).
What is the diameter range of coarse particles (PM10)?
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Between 2.5 × 10⁻⁶ m and 1 × 10⁻⁵ m (2500 nm to 10 000 nm).
What common name is given to coarse particles (PM10)?
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Dust.
Which are smaller: nanoparticles or fine particles (PM2.5)?
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Nanoparticles (1–100 nm) are smaller than fine particles (100–2500 nm).
If the side of a cube decreases by a factor of 10, how does its surface area to volume ratio change?
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It increases by a factor of 10.
Why may nanoparticles have different properties from the same material in bulk?
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Because of their very high surface area to volume ratio.
Why can smaller quantities of a nanoparticle material be effective compared with the bulk material?
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Their high surface area to volume ratio means more of the material is exposed at the surface, so less is needed for the same effect.
Nanoparticles may have properties different from the bulk material because of their high ? ratio.
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surface area to volume
Express 100 nm in metres using standard form.
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1 × 10⁻⁷ m.
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