Materials

Which of these statements about nanoparticles is correct?

• They have large volume to surface area ratios

• They have large surface area to volume ratios

• They have small surface area to volume ratios

What type of instrument do you need to see a nanoparticle

• Light microscope
• Electron microscope
• Telescope
• Binoculars

Which of the following is correct for nanometers

• 1 nm = 1 x 10^-3 m

• 1 nm = 1 x 10^-6 m

• 1 nm = 1 x 10^-9 m

• 1 nm = 1 x 10^-12 m

Which of the following is not a use of nanoparticles

• medicine

• suncream

• cosmetics

• fertilisers

Tags

NGSS.HS-PS2-6

Which of the following are risks associated with nanoparticles? Select all that apply.

• absorbed into the body (damage cells)

• explosive/ flammable

• disposal (environmental hazard)

• corrosive/ irritant

Which nanoparticle is used in sun- protection creams?

• graphene

• fullerene

• silver nitrate

• zinc oxide

Why do nanomaterials have different properties compared with traditional materials?

• They have a much smaller surface area

• They have a much larger surface area

Which nanomaterial effective at killing bacteria and is used in sterilisation of equipment/wound dressings in hospitals?

• fullerene

• graphene

• silver nitrate

• zinc oxide

The smaller an object the smaller its surface area to volume ratio is

• true
• false

A thermochromic substance ...

• Changes colour when the light intensity changes.

• Changes colour when the temperature changes.

• Absorbs up to 1000 x its volume in water.

• Returns to its original shape when heated.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4