Download Giant metallic structures

Giant metallic structures
• Describe the difference
between the structures
of diamond and
graphite.
• Explain the different
properties of these
versions of carbon.
• Graphite
• Diamond
Learning questions
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What general properties do metals have?
Do all metals have these properties?
Why do metals have these properties?
How are metals held together in a bond?
What properties do metals have?
• What do we use metals for? Do all metals do
the same job? Give some examples.
Comparing properties
• You will be investigating some properties of
metals and deciding how similar/different
they are.
• Make sure you make note of your
observations.
Metal
Magnetic
Melting
point
(high/low)
Conducts
heat?
Electrical
conductor?
Malleable?
(Change
shape)
Reacts with
water?
Explaining the properties
• How are metals held together?
• Its structure affects all of the properties you
see in metals.
Metallic bonding to explain properties
• We can use what we know about metallic
bonding to explain:
1. Why metals have a high melting point.
2. Why metals conduct electricity.
3. Why metals conduct heat.
4. How metals are malleable.
Use your diagram and the internet to help
explain why metals have these properties.
Properties explained
• High melting point is due to the strong
attraction between metal ions and free
electrons.
• Conductivity due to the electrons ability to
move quickly and pass on the energy.
• metals are very malleable, they can be
readily bent, pressed or hammered into
shape. The layers of atoms can slide over
each other without fracturing the structure
The reason for this is the mobility of the
electrons.
Alloys
• What is an alloy?
• An alloy is a mixture of a metal with another element.
• This affects the properties,(like make it harder) of the
material by changing the structure.
• How might it do this?
• Hint: look at the change to the structure
Using bonding to explain properties
• Use the keywords to describe the bonding and
properties of the following molecules:
• Carbon dioxide (CO2)
• Sodium chloride (NaCl)
• Iron (Fe)
(9 marks)
Key terms:
Metallic bonding; Giant covalent structure; Ionic lattice; Simple covalent
molecule.
Weak forces of attraction; strong attraction; high melting point; low melting
point; conducts electricity; doesn’t conduct electricity; free electrons;
malleable
• Is copper magnetic?
• Why does this happen?