4.2.4 Bulk and surface properties of matter including nanoparticles

Question 1

Convert 1 nm (nanometre) to m

Answer 1

1x10^(-9)m

Question 2

Convert 1 μm (micrometre) to m

Answer 2

1x10^(-6)m

Question 3

Convert 1 mm (millimetre) to m

Answer 3

1x10^(-3)m

Question 4

What is the diameter of a nanoparticle?

Answer 4

1-100 nm

Question 5

What is the common term for coarse particles?

Answer 5

Dust

Question 6

Making the length of a side of a cube 10 times smaller has what effect on the surface area to volume ratio?

Answer 6

Increases by factor of 10

Question 7

Nanoparticles have a high surface area to volume ratio compared to normal sized particles. Give two advantages that are caused by this

Answer 7

Different properties to bulk material (normally more reactive).
Smaller quantities are needed to be as effective.

Question 8

State uses of nanoparticles

Answer 8

Medicine, electronics, cosmetics, sun creams, deodorants, catalysts

Question 9

Describe the possible risks of using nanoparticles

Answer 9

May be toxic or cause cancer. Some people believe more studies should take place before nanoparticles are used on a wider scale.