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Nanoparticles are found in some sunscreens - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

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Nanoparticles are found in some sunscreens. (i) An atom has a radius of about 0.1 nm. A nanoparticle might have a radius of about: A 0.01 nm B 0.1 nm C 50 nm D... show full transcript

Worked Solution & Example Answer:Nanoparticles are found in some sunscreens - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

Step 1

A nanoparticle might have a radius of about:

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Answer

The correct option is C 50 nm. Nanoparticles, by definition, typically have sizes ranging from 1 nm to 100 nm, so among the given choices, 50 nm is the correct answer.

Step 2

A useful property of nanoparticles in sunscreens is that they:

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Answer

The correct option is D prevent harmful UV radiation reaching the skin. This property is particularly valuable in sunscreens, as nanoparticles can effectively block UV radiation.

Step 3

Calculate the surface area to volume ratio.

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Answer

To find the surface area to volume ratio, use the formula:

Surface Area to Volume Ratio=Surface AreaVolume\text{Surface Area to Volume Ratio} = \frac{\text{Surface Area}}{\text{Volume}}

Given the surface area of 38,400 nm² and a volume of 51,200 nm³:

Surface Area to Volume Ratio=38400 nm251200 nm3=0.75\text{Surface Area to Volume Ratio} = \frac{38400 \text{ nm}^2}{51200 \text{ nm}^3} = 0.75

Thus, the surface area to volume ratio is 0.75:1.

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