@Will carbon conduct electricity?
Yes
No
Only when molten

@Which one of the following is PURE carbon?
Diamond
Ruby
Emerald

@In carbon dioxide, then main types of bond are:
Covalent
Ionic
Van der Waals

@Which two substances are both pure carbon?
Graphite and diamond
Ruby and diamond
Bauxite and Graphite

@Which one of the following is NOT a property of diamond?
Low melting point
Transparent
Does not conduct electricity

@Which one of the following is a property of graphite?
Conducts electricity
Fairly hard substance
Transparent

@Diamond is one of the hardest substances known. This is because:
the atoms are tightly packed in a giant structure
the atoms are arranged in layers
diamond contains both ionic and covalent bonds

@The temperature diamond melts at is:
3550C
95C
300C

@Carbon monoxide gas is:
Poisonous
Dangerous only in very large concentrations
Harmless

@How much carbon monoxide in the air can be dangerous?
About 0.1%
5%
Over 60%
