Transcript Powerpoint_New

Aluminium and Titanium
Learning Objectives
• To be able to recall properties and uses of
aluminium and titanium
• To be able to describe the process of
aluminium extraction
• To be able to explain why the extraction of
aluminium and titanium are so expensive
Starter Activity – Key Word Bingo
Reduction
Reactivity Series
Ore
Electrolysis
Carbon
Hydrogen
Native State
Haematite
Bauxite
Alloy
Blast Furnace
Steel
Al2O3 – Bauxite (Aluminium oxide)
1. What is the chemical name for Bauxite?
2. How many elements are in Bauxite- name them?
3. How many atoms in Bauxite?
4. How is Bauxite bonded? (Ionic, Covalent or Metallic)
5. What do we call compounds such as Bauxite,
where there is a decent amount of the metal to
make it worth extracting?
Extraction of Aluminium
•We extract aluminium using electrolysis
as
it is more reactive
than carbon
• Referring
to the reactivity
series,
how do we extract aluminium?
•An electric current is passed through
MOLTEN aluminium oxide at high
temperatures to break it down
↓Electrolysis is very expensive
↓High temperatures are required so a
great deal of electricity is required
↓Environmental issues arise due to the
amount of energy required
Extraction of Titanium
•We can displace it from its oxide using carbon, it reacts with
titanium making it very brittle
Titanium is not a very reactive metal, how do
•Therefore we use a more reactive metal for extraction, Sodium or
you think we extract this?
Magnesium
•However sodium and magnesium have to be extracted using
electrolysis
•Before titanium displacement can occur, titanium oxide is
converted to titanium chloride
•Chloride is distilled to purify it, then titanium can be displaced
using sodium or magnesium
•This is a very costly process due to all the steps
http://www.youtube.com/watch?v=RX14rA-tylo&list=PLD2C43638C526D33F&index=6
Video
1.Highest
all recyclable
Watch recycling
the videopotential
and writeofdown
key data
materials
relating to the recycling of aluminium
2.1kg of recycled Aluminium saves 8kg of
bauxite, 4kg chemical products, 14 kilowatthours electricity
3.Recycling 1 aluminium can will run a TV for 3
hours
4.Recycling rate of 90%
Activity
1. Complete ‘Uses and Properties’ Worksheet
2. Produce a PERSUASIVE poster encouraging
people to recycle aluminium
EXTENSION
Question 5 set Exam Questions
(You may need a textbook)
Plenary
Sort into Aluminium and Titanium
Racing Bikes
Bicycles
Replacement
Joints
Drinks Cans
Aeroplanes
High
Performance
Aircrafts
Saucepans
Jet Engines
Cooking Foil
Nuclear
Reactors