nanoparticles

Question 1

nanoparticles

Answer 1

really tiny particles
contain roughly a few hundred atoms
bigger than atoms and simple molecules

Question 2

surface area to volume ratio

Answer 2

surface area to volume ratio= surface area/ volume
nanoparticles have a really high surface area to volume area
this gives them different properties from larger particles because a much greater proportion of their atoms are available to interact with substances they come into contact with

Question 3

modifying the properties of materials

Answer 3

make good catalyst because of high surface area to volume ratio
used in sun creams and deodorant and medicine
nanotubes are a good conductor of electricity
nanoparticles make plastics stronger

Question 4

effects of nanoparticles on health

Answer 4

the way they affect the body isnt fully understood
they need to be tested as to minimise the risks
the short and long term impacts on ones health are unknown