C2 : Nanoparticles

Question 1

What is a millimeter compared to a meter

Answer 1

1 x 10^-3 meters

Question 2

What is a micrometer compared to a meter

Answer 2

1 x 10^-6 meter

Question 3

Whats a nanometer compared to a meter

Answer 3

1 x 10^-9 meter

Question 4

Coarse particles

Answer 4

Coarse particles have a diameter of between 1 x 10^-5 and 2.5 x 10^-6m
Coarse particles contain many thousands of atoms

Question 5

Fine particles

Answer 5

Fine particles have a diameter between 100 - 2500 nanometers (1 x 10^-7m and 2.5 x 10^-6m)
Fine particles contain several thousand atoms

Question 6

Nanoparticles

Answer 6

nanoparticles have a diameter between 1 - 100 nanometers .
Nanoparticles only contain a few hundred atoms
Nanoparticles have a huge surface area to volume ratio even a small amount of nanoparticles has a massive surface area
We need a much smaller quantity of nanoparticles compared to materials with normal particle size e.g. catalysts

Question 7

Size to volume ratio

Answer 7

As the particle size decreases by ten times, the surface area : volume ratio increases by ten times

Question 8

What are nanoparticles used in

Answer 8

Medicines
Sun creams
Cosmetics
Deodorants
Electronics
Catalysts

Question 9

Risks of using nanoparticles

Answer 9

. Nanoparticles can be absorbed into the body and enter our cells
. No-one knows the potential long term effects of this