GCSE 1.4 Nanoparticles

What is the size range of a nanoparticle?

• 1-100 nm

• 100-1000 nm

• 1-10 nm

• 10-1000 nm

What is the approximate size of one nanometer in meters?

• 0.000 000 001 m

• 0.000 000 01 m

• 0.000 000 1 m

• 0.000 001 m

What is a key difference between bulk materials and nanoparticles?

• Bulk materials consist of a few hundred atoms, while nanoparticles consist of huge numbers of atoms.

• Bulk materials consist of huge numbers of atoms, while nanoparticles consist of only a few hundred atoms.

• Bulk materials are smaller in size compared to nanoparticles.

• Bulk materials have a higher surface area to volume ratio compared to nanoparticles.

What is the surface area of one side of a larger cube with dimensions 100 cm × 100 cm × 100 cm?

• 1000 cm²

• 10000 cm²

• 60000 cm²

• 100000 cm²

What is the surface area to volume ratio of a smaller cube with dimensions 10 cm × 10 cm × 10 cm?

• 0.06 : 1

• 0.6 : 1

• 6 : 10

• 60 : 1

Which of the following is a benefit of using nanoparticles of zinc oxide in sun creams?

• They are difficult to rub in.

• They are visible on the skin.

• They do not degrade on exposure to the sun.

• They provide less effective protection from UV rays.

What is a potential risk of using nanoparticles in sun creams?

• They are too large to penetrate cell membranes.

• They are less reactive than bulk material.

• They may cause cell damage in the body.

• They have no harmful effects on the environment.

How does the surface area to volume ratio change when the sides of a cube decrease by a factor of 10?

• It decreases by a factor of ten.

• It increases by a factor of ten.

• It remains the same.

• It decreases by a factor of one hundred.

Which of the following is NOT a benefit of using nanoparticles in sun creams?

• Better skin coverage

• Clear and colourless appearance

• Effective protection from UV rays

• Harmful effects on the environment