topic 2 metals Flashcards
metals are good conductors of …
heat and electricity
4 properties of aluminium
- strong
- low density
- good conductor of electricity
- resistant to corrosion
what is aluminium used for
cans, cables
2 properties of copper
- good conductor of electricity
- resistant to corrosion
what is copper used for
water pipes
4 properties of gold
- very resistant to corrosion
- very unreactive
- shiny and soft
what is gold used for
jewellery
2 properties of steel
- very dense
- very strong
what is steel used for
bridges, trains
how are alloys harder than pure metals
because they have different sized atoms and an irregular structure
why are metals malleable
the layers of the atoms can slide over each other
what is a metallic bond
the electrostatic attractions in metals
how are alloys harder than pure metals
because the different sizes of the atoms distorts the layers, making it more difficult to slide over each other
what do metals consist of
a giant structure
small covalent molecules have low … (why)
melting and boiling points because they have very week intermolecular forces
why are giant covalent molecules solids at room temp
because they have millions of strong covalent bonds
why does silicon dioxide have a high melting and boiling point `
because a huge number of covalent bonds must be broken and this takes a lot of energy
3 facts about graphite
-soft and slippery
-good conductor of electricity and heat
high melting and boiling points
why does graphite have a high melting and boiling point
because it has many strong covalent bonds and takes a lot of energy to break
how is graphite slippery
as the layers in graphite can slide over each other
how can graphite conduct electricity
because one electron on the outer shell is not in a covalent bond- it has delocalised electrons
graphite is not a …
metal
what is graphene
a single layer of graphite- it is one atom thick
graphene is a good conductor of …
electricity
2 properties of graphene
- strong
- good conductor of electricity
what are fullerenes
molecules of carbon atoms with hallow shapes
what 2 types of rings can fullerenes have
- hexagonal rings or
- rings of 5 or 7 carbon atoms
