Metals explain why the bonding arrangement gives metals their properties
Describe metallic bonding
State advantages and disadvantages of recycling
Recall uses for iron, copper and aluminium
Know some properties of metals
Conduct electricity and heat
High melting and boiling points
Hard and tough
Used for car bodies
Good conductor of heat and electricity
Used for saucepan bottoms and wiring
Resistant to corrosion
Used for greenhouse frames and aeroplane bodies
In a piece of metal, all the atoms lose their outer electrons to gain full shells, and become positive ions. These negative electrons move around between the metal ions . The negative electrons attract the positive ions, making the structure strong . Metals are good at conducting electricity and heat because of the free electrons which are able to move around.
Less damage to environment
Uses less energy
Less poisonous waste
Scrap metal must be collected
Metal must be sorted from other materials
Difficult if metals in small quantities
Depends on the public sorting their rubbish
These are mixtures of two or more metals
E.g. brass, duralumin, solder
The properties are different from the base metals
Complete the following sentences, using words from the box.
a There are strong forces between ions, so metals are ____________________________ .
b The electrons have a _______________ , and some of them can move, so metals
c Rows of ions can move over each other, so metals are _______________ .
d Some _______________ can move, so metals are good at _______________ heat.