Properties of matter

Question 1

Nanoparticles:

Answer 1

• 1-100 nanometres
• contain a few hundred atoms
• involve fullerenes
• high surface area to volume ratio

Question 2

Nanoparticle uses:

Answer 2

• have high surface area to volume ratio so would make good catalysts
• produce highly selective sensors
• make stronger, lighter building materials
• do not leave white marks in cosmetics (e.g. suncream)
• lubricant coating, as they reduce friction
• conduct electricity so can be used in small electrical circuits for computers

Question 3

What is a possible disadvantage of nanoparticles?

Answer 3

there are some concerns that nanoparticles may be toxic to people. they may be able to enter the brain from the bloodstream and cause harm.