Worksheet: Nanoparticles

In this worksheet, we will practice identifying nanoparticles, describing their properties and uses.

Q1:

A nanoparticle is shaped like a cube with sides 20 nm in length. What is the surface-area-to-volume ratio?

Q2:

How many atoms does a single nanoparticle typically contain?

  • AA few thousand
  • BLess than ten
  • CA few hundred
  • DBetween ten and one hundred
  • ETens of thousands

Q3:

A human hair has a diameter of 80,000 nm. How many nanoparticles with a diameter of 50 nm would fit across the human hair? Give your answer to the nearest whole number.

Q4:

Why can nanoparticles be used as effective catalysts in very small quantities?

  • AThey are transition metals.
  • BThey are lightweight.
  • CThey have low reactivity.
  • DThey are inflammable.
  • EThey have a high surface-area-to-volume ratio.

Q5:

Which of the following reasons could explain why 1 g of gold nanoparticles are a better catalyst than 1 g of solid gold metal?

  • AThe nanoparticles have a smaller mass.
  • BThe nanoparticles have a larger surface area.
  • CThe nanoparticles have a smaller surface area.
  • DThe nanoparticles have a greater mass.
  • EThe nanoparticles have a larger volume.

Q6:

A type of nanoparticle known as a nanocube is shown in the diagram. Using the dimensions provided, what is the volume of the nanoparticle?

Q7:

Nanoparticles are used in sun cream. Which of the following reasons is not an advantage of adding nanoparticles to sun creams?

  • ANanoparticles in sun creams are absorbed deeper into the skin and provide longer protection.
  • BNanoparticles in sun creams may be washed away into the environment.
  • CNanoparticles in sun creams result in a transparent liquid.
  • DNanoparticles in sun creams give better skin coverage.
  • ENanoparticles in sun creams provide better protection against UV rays.

Q8:

Which of the following statements about nanoparticles is correct?

  • ANanoparticles have a low surface-area-to-volume ratio.
  • BNanoparticles cannot be used as catalysts.
  • CNanoparticles cannot form a transparent layer.
  • DNanoparticles pose no risks to the environment.
  • ENanoparticles can be used as an antibacterial agent.

Q9:

What is the diameter, in meters, of the nanoparticle in the diagram?

  • A2×10 m
  • B2×10 m
  • C2×10 m
  • D0.2×10 m
  • E20×10 m

Q10:

Which of the following statements could not be used to describe nanoparticles?

  • AParticles with a high surface-area-to volume ratio
  • BParticles 1–100 nm in size
  • CParticles that are smaller than most atoms
  • DParticles with different properties than those of the same material in bulk
  • EParticles containing a few hundred atoms or ions

Q11:

What property of some nanoparticles means that they could be used to form microscopic electrical circuits for computer chips?

  • AThey are easily absorbed by the body.
  • BThey have antibacterial properties.
  • CThey continuously release silver ions.
  • DThey conduct electricity.
  • EThey block UV rays.

Q12:

Put the following sizes of particle in the correct order from smallest to largest.

  • ACoarse particles, fine particles, nanoparticles
  • BFine particles, coarse particles, nanoparticles
  • CCoarse particles, nanoparticles, fine particles
  • DNanoparticles, fine particles, coarse particles
  • ENanoparticles, coarse particles, fine particles

Q13:

What will happen to the total volume and the total surface area of a cube being split into 8 equally sized pieces, as shown in the diagram?

  • AThe total volume doubles and the total surface area is the same.
  • BThe total volume is the same and the total surface area is eight times larger.
  • CThe total volume doubles and the total surface area doubles.
  • DThe total volume is eight times larger and the total surface area is eight times larger.
  • EThe total volume is the same and the total surface area doubles.

Q14:

What is the surface-area-to-volume ratio of the nanoparticle in the diagram?

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