Topic 4 Nanoparticles

Question 1

What is a nanoparticle?

Answer 1

A structure that is 1-100nm in size. It contains a few hundred atoms

Question 2

How to convert nm to m

Answer 2

Add nine 0s after the decimal point or add x10 to the power of -9

Question 3

Convert 2nm to m

Answer 3

0.0000000002nm or 2x10 to the power of -9

Question 4

How to calculate surface area

Answer 4

Calculate the area of one side and multiply by the number of sides of the shape

Question 5

How to calculate the volume

Answer 5

LXBXH

Question 6

Calculate the surface area of a cube with a length of 10cm

Answer 6

10x10=100
100x6=600cm2

Question 7

Calculate the volume of a cube with a length of 10cm

Answer 7

10x10x10=1,000cm3

Question 8

How to calculate surface area to volume ratio

Answer 8

Calculate surface area, calculate volume then place in a ratio (SA:V) and simplify until V=1

Question 9

What can we conclude about two cubes, one with a length of 50cm and one the length of 5cm?

Answer 9

When the sides of a cube have decreased by a factor of 10 (eg 50cm to 5cm) , the surface area to volume ratio increases by a factor of 10 (eg 50cm = 0.12:1 while 5cm = 1.2:1) (eg the ratio of the smaller cube will always be bigger)

Question 10

What is the comparison between the bulk material and its nanoparticles?

Answer 10

Nanoparticles show different properties from their bulk material because of their LARGE SURFACE AREA

Question 11

Difference between bulk gold and gold nanoparticles’ ratios

Answer 11

Bulk gold is very unreactive but gold nanoparticles can be used as a catalyst in some chemical reactions

Question 12

Benefits of using nanoparticles in Suncream

Answer 12

Better skin coverage, more effective protection, colourless, does not degrade on exposure to the sun

Question 13

Risks of using nanoparticles in suncream

Answer 13

Potential damage to the body - fairly new and not enough research done on it and has harmful effects on the environment