Topic 2 - Bonding, Structure and Properties of Matter

Question 1

Coarse particles

Answer 1

(PM10) have a diameter between 2500nm and 10000nm. They are also called dust

Question 2

Fine particles

Answer 2

(PM2.5) have a diameter between 100nm and 2500nm.

Question 3

Nanoparticles

Answer 3

Have a diameter between 1nm and 100nm. These particles only contain a few hundred atoms

Question 4

Nanoparticles have a large/small surface area to volume ratio

Answer 4

Large

Question 5

Nanoparticles have a large surface area to volume ratio so they could help make new …

Answer 5

Catalysts

Question 6

Nanoparticles can/can’t conduct electricity

Answer 6

Can

Question 7

List 2 uses of nanoparticles

Answer 7

They can be added to deodorants and are being used in cosmetics

Question 8

What is nanoscience

Answer 8

An area of science that investigates the uses and properties of nanoparticles

Question 9

Surface area to volume ratio =

Answer 9

Surface area / volume

Question 10

Give one potential application of nanoparticles that can conduct electricity

Answer 10

Eg in electrical circuits for computer chips

Question 11

Nanoparticles may have applications in medicine. State one risk of using nanoparticles in this way

Answer 11

Because it can effect the long term health impacts

Question 12

What size are the particles studied in nanoscience

Answer 12

1nm to 100nm

Question 13

The sides of a cube are 50nm long. Que es el surface area to volume ratio

Answer 13

50 x 50 = 2500 x 6 = 15000
50 x 50 x 50 = 125000
15000 / 125000 = 0.12nm

Question 14

Why are nanoparticles being used in suncreams

Answer 14

Because they have been shown to be better than the materials in traditional sun creams at protecting skin from harmful UV rays

Question 15

What is the risk of using nanoparticles in suncream

Answer 15

It is not clear if they can get into your body and if they do they might damage cells. They could damage the environment too if washed away