Nanoparticles

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

To calculate the surface area of a cube, which formula is used?

• Length x width x height

• Length x width x 6

The surface area of this cube would be calculated as:

3 x 3 x 6 = __Inches².

Calculate the surface area of this cube (sides: 5cm).

Answer = ___cm².

To calculate the volume of a cube, which formula is used?

• Length x width x height

• Length x width x 6

The volume of this cube would be calculated as:

3 x 3 x 3 = __Inches³.

Calculate the volume of this cube (sides: 5cm).

Answer = ___cm³.

The surface area to volume ratio of this cube is therefore 54:27. What is the simplest version of this ratio?

• 54:27

• 2:1

• 5:2

• 3:1

Select all the uses of nanoparticles below.

• Catalysts

• Suncreams

• Cosmetics

• Sock deodorizers

Which is a concern over the use of nanoparticles in suncreams?

• Zinc Oxide nanoparticles block UV light from reaching the skin.

• Zinc Oxide nanoparticles are invisible.

• They could pass through the skin into the body and have harmful effects.