C2 Giant Covalent Structures & Fullerenes OCR Gateway (9-1)

?
  • Created by: Aleena
  • Created on: 09-04-18 12:49
What are covalent structures made of?
Carbon atoms bonded together in covalent bonds?
1 of 25
What is the maximum number of covalent bonds a carbon atom can have?
Upto 4 covalent bonds-bonds easily to other carbon atoms to form chains and rings
2 of 25
What is the difference between giant covalent structures and giant ionic lattices?
giant covalent structures have no charge ions
3 of 25
Can giant covalent molecules conduct electricity?
no, not even when molten, except for graphite, graphene & fullernes)
4 of 25
Why are diamonds ideal for jewellery?
Because they are lustrous(sparkly) & colourless
5 of 25
Why are diamonds ideal for use as cutting tools?
1) each carbon atom in diamond forms 4/4 covalne tbonds in a very rigid giant covalent structure0makes diamond hard 2)All those covalent bonds require lots of energy to overcome, so diamond have high melting/boiling point
6 of 25
Can diamonds conduct electricity?Why?
No because there are no free electrons as each carbon atom has 4 covalent bonds out of the 4 available covalent bonds a carbon atom can have
7 of 25
How does graphite look like?
Black, opaque but shiny
8 of 25
In graphite how many covalent bonds does each carbon atom have?
3 out of the 4 available covalent bonds
9 of 25
Why is graphite a good lubricating material?
Carbon atoms form layers with a hexagonal arrangement of atoms.The layers in graphite can slide over each other because the forces between them are weak. This makes graphite slippery, so it is useful as a lubricant.
10 of 25
How does graphite work in pencils?
Due to the fact the layers in grpahite are held together with weak forces, this makes them slippery-this means they can be rubbed off onto paper to leave a black mark
11 of 25
Can graphite conduct electricity?Why?
Yes because each carbon atom has one non-bonded outer electron, which becomes delocalised.delocalised electrons are free to move through the structure, so graphite can conduct electricity.
12 of 25
This makes graphite useful for what?
This makes graphite useful for electrodes in batteries and for electrolysis.
13 of 25
Why does graphite have a high melting point?
This is because the strong covalent bonds require alot of energy to overcome
14 of 25
What is the name for one sheet of Graphite?
Graphene
15 of 25
How thick is graphene?
1 atom thick-so its transparent and really light
16 of 25
Is graphene strong?
Yes because of its strong covalent bonds
17 of 25
Can graphene conduct electricity?Why?
yes because it has delocalised electrons which are completely free to move about - makes graphene better at conducting electricity than graphite
18 of 25
What are Fullernes?
Forms of Carbons-they are large carbon molecules
19 of 25
Are Fullerenes giant covalent structures?
No, they're large molecules shaped like hollow balls/tubes
20 of 25
Can Fullerenes conduct electricity?Why?
Yes because they have delocalised electrons which are free to move about - so can conduct electricity
21 of 25
How are the carbons atoms in Fullernes arranged?
In rings
22 of 25
Do Fullerenes have high melting and boiling points?
Yes they have high melting points for molecular substances because they're big molecules, big molecules have more covalent bonds to overcome-so they have higher melting and boiling points. But aren't as high as diamond or grpahite
23 of 25
Give some examples of Fullernes
Bucky balls and Nanotubes
24 of 25
Are Fullerenes Nanoparticles?
Yes
25 of 25

Other cards in this set

Card 2

Front

What is the maximum number of covalent bonds a carbon atom can have?

Back

Upto 4 covalent bonds-bonds easily to other carbon atoms to form chains and rings

Card 3

Front

What is the difference between giant covalent structures and giant ionic lattices?

Back

Preview of the front of card 3

Card 4

Front

Can giant covalent molecules conduct electricity?

Back

Preview of the front of card 4

Card 5

Front

Why are diamonds ideal for jewellery?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Giant Covalent Structures & Fullerenes resources »