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Flashcards in C3e Deck (10):
1

What are the properties of a diamond?

-lustrous
-colourless
-very high melting point
-doesn't conduct electricity
-hard

2

What is the structure pf a diamond?

-each carbon forms four covalent bonds in a very rigid giant covalent structure making it really hard
-the strong covalent bonds take lots of energy to break, giving diamond an very high melting point
-no free electrons or ions, so no conducting electricity

3

What is the structure of graphite?

-each carbon atom form three covalent bonds, creating sheets of carbon atoms which are free to slide over each other
-layers held together weakly so they are slippery and can be rubbed off (how pencils work)
-lots of energy needed to break covalent bonds so high melting point
-since only three out of each carbons' four outer electrons are used in bonds, there are lots of delocalised (spare) electrons that can move, conducts electricity

4

What are the properties of graphite?

-black
-opaque
-kind of shiny
-rubs off on paper
-high melting point
conducts electricity

5

What are the uses of diamonds and why?

-cutting tool because high melting point and hardness
-jewellery because lustrous

6

What are the uses of graphite and why?

-pencils as layers are slippery and can be rubbed off
-lubricating material, as slippery

7

What are giant molecular structures

-usually don't conduct electricity because there aren't any fee electrons (graphite is an exception)
-carbon can form giant molecular structures because it can form lots of covalent bonds with itself
-all the covalent bonds give giant molecular structures strength, high melting point and they do not dissolve in water

8

What are nanotubes?

-tiny hollow carbon tubes
-huge surface area, so can make great industrial catalysts (individual catalyst molecules cab be attached to the nanotubes)

9

What are fullerenes?

-molecules of carbon
-shaped like closed tubes or hollow balls
-used to cage other molecules, fullerene structure forms around another atom or molecule which is then trapped inside
-could be a new way of delivering drugs in the body, e.g.slow release

10

What are allotropes?

-different structural forms of the same element in the same physical stat, e.g. they're all solids