Nanoparticles

Nanoparticles

Multiple Choice

Buckminsterfullerene is a nanoparticle and has a diameter of 1.1nm. The diameter of a methane molecule is 0.41nm.

Is a methane molecule a nanoparticle?

• Yes

• No

A methane molecule is not a nanoparticle, because its diameter is too small.

A nanoparticle has a diameter of 1 - 100nm.

0.46nm is smaller than 1nm.

Multiple Choice

A nanoparticle has a diameter of 31nm. Calculate the number of these nanoparticles that would fit across a human hair (100 000nm).

Calculate to 3 significant figures.

• 3225.8

• 32

• 3230

• 3226

100 000nm  $\div$  31nm = 3225.8

 = 3230

Multiple Choice

What is the diameter of a methane molecule in metres, giving the answer in standard form.

Diametre of a methane molecule: 0.41nm

• $4.1\ x\ 10^{-10}m$
  

• 0.41m

• $4.1\ x\ 10^{10\ }m$

• $4.1x10^{-8}m$

Multiple Select

What are some uses for nanoparticles? (tick all that apply)

• new paints, new make up, new food

• new paints, new make up, new medicines

• new paints, new medicines, new books

• new books, new food, unicorns

Multiple Choice

True or false: nanoparticulates have different properties than the same substances in bulk.

• True

• False

Fill in the Blank

Nanoparticulates are materials made from _____________

Fill in the Blank

What is the surface area to volume ratio for a cube shaped nanoparticle with sides of 10 nm?

 $surface\ area\ =\ 6\ x\ \left(length\right)^2$  

 $volume\ =\ \left(length\right)^3$  
 $ratio\ =\ \frac{\left(surface\ area\right)}{\left(volume\right)}$  

Multiple Select

The large surface area to volume ratio of nanoparticulates leads to new developments such as... (tick all that apply)

• self cleaning toilets, showers, and sinks

• self cleaning windows, ovens, clothes

• catalysts to speed up chemical reactions

• catalysts to create unicorns, hippos, and elves

Fill in the Blank

A nanoparticle contains just a few _______ atoms.

Multiple Select

Two advantages of nanoparticulates used in sunscreen are: (tick 2)

• better skin coverage

• takes a long time to break down once its released into the environment

• More effective protection from the Sun's ultra violet rays

• potential to enter bloodstream

Multiple Select

Two disadvantages of nanoparticulates used in sunscreen are: (tick 2)

• better skin coverage

• takes a long time to break down once its released into the environment

• More effective protection from the Sun's ultra violet rays

• potential to enter bloodstream

Open Ended

Silver has antibacterial properties. Silver nanoparticles are used in some sports socks. Suggest an advantage of these socks, and describe a possible hazard to the environment they may cause.

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Poll

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Open Ended

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