nanoparticles, smart materials, EF and %M

Question 0

fullerenes and nanotubes: link them

Answer 0

• fullerenes can be joined together to make nanotubes (hollow carbon tubes)
• all of the covalent bonds make nanotubes very strong
• can be used to reinforce graphite in tennis rackets

Question 1

what are nanoparticles made up of

Answer 1

-fullerenes (which are made of carbon atoms arranged in hexagonal rings, shaped like hollow balls/closed tubes)

Question 2

uses of nanoparticles (3)

Answer 2

• can help to make industrial catalysts (big surface area:volume ratio)
• cosmetics (suncream- does the job but no white marks)
• stronger and lighter building materials

Question 3

what are smart materials

Answer 3

materials that change in response to their environment

Question 4

how do memory shape alloys work (5)

Answer 4

• heat it to randomly coil the molecules
• cool it to stretch them out
• it can be bent and twisted when cool
• then heat it again and the stretched molecules will return to their original coiled up shape
• can be used to make glasses frames, or NITINOL for dental braces

Question 5

how to calculate % mass

Answer 5

1) atomic mass of wanted %
2) molecular mass of entire molecule
3) 1x amount/2= %mass

Question 6

how to calculate empirical formula

Answer 6

1) given mass for each
2) divide that by atomic mass of each
3) divide by the smallest
4) find ratio
5) write formula