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1. Titanium dioxide nanoparticles are used in some sunscreens - Edexcel - GCSE Chemistry - Question 1 - 2022 - Paper 1
Question 1
1. Titanium dioxide nanoparticles are used in some sunscreens. (i) State one property of titanium dioxide nanoparticles that make them suitable for use in sunscreen... show full transcript
Worked Solution & Example Answer:1. Titanium dioxide nanoparticles are used in some sunscreens - Edexcel - GCSE Chemistry - Question 1 - 2022 - Paper 1
Step 1
State one property of titanium dioxide nanoparticles that make them suitable for use in sunscreens.
Answer
One key property of titanium dioxide nanoparticles is that they effectively absorb ultraviolet (UV) radiation. This quality allows them to protect the skin from harmful UV rays while being non-toxic and transparent, making them ideal for use in sunscreens.
Step 2
Suggest one possible risk associated with using nanoparticles.
Answer
One potential risk associated with the use of nanoparticles is their long-term effects on health and the environment. For instance, these nanoparticles may accumulate in the body or the environment, leading to unforeseen negative health impacts or environmental consequences.
Step 3
State the trend shown by the data in Figure 1.
Answer
The trend shown in Figure 1 indicates that as the diameter of the nanoparticle increases, the surface area to volume ratio decreases. This suggests an inverse relationship between the size of the nanoparticles and their surface area to volume ratio.