AQA Chemistry: Nanoparticles

Nanoparticles have many uses: which of this is NOT a use of nanoparticles?

• Suncream

• Electronics

• Cosmetics

• Fizzy drinks

• Medicines

What is an advantage of using nanoparticles over fine (thus larger) particles in sun cream?

• They have a high surface area:volume ratio and therefore less is required to cover the same space

• They are much bigger so cover more area

• They penetrate the skin

• They are broken down inside the body

What is NOT a problem with nanoparticles?

• They get into water systems are toxic to fish

• The effects on the body aren't fully understood

• You have to use a lot of them to get any effect

• They don't degrade

• 20nm³

• 60nm³

• 400nm³

• 8000nm³

• Larger

• Smaller

• The same size

Suggest one reason why 1 g of cobalt oxide nanoparticles is a better catalyst than 1g of cobalt oxide powder (1 mark)

• Bigger mass

• Smaller mass

• Bigger surface area

• Smaller surface area

Nanoparticles are in the range of:

• 1 to 100 nm

• 100 to 2,500 nm

• 2500 to 10,000 nm

• 100,000-200,000 nm