do now! can you stick the summary and word sheets in? don’t forget we have a test on friday...
TRANSCRIPT
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Do now!Can you stick the
summary and word sheets in?
Don’t forget we have a test on Friday
(topics 9e and 9f)
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Last lesson
• Extraction of metals from their ores related to the reactivity series
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Ores
Most metals are found naturally in rocks called ores. They are in compounds, chemically bonded to other elements
iron ore
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Native
Some unreactive metals can be found as elements. They are called native metals.
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Roasting
Some unreactive metals can be extracted from a compound simply by heating. This is called roasting.
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More reactive metals?
• Zinc, iron, tin, lead
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Extracting metals with carbon
Carbon is higher than some metals in the reactivity series. It can be used to extract medium reactive metals.
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Extracting metals with carbon
lead oxide + carbon lead + carbon dioxide
2PbO(s) + C(s) 2Pb(s) + CO2(g)
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Extracting metals with carbon
lead oxide + carbon lead + carbon dioxide
2PbO(s) + C(s) 2Pb(s) + CO2(g)
carbon is oxidised
lead oxide is reduced
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The Blast furnace
1000°C
1500°C
1900°C
Iron ore (haematite), coke (carbon) and limestone (calcium carbonate)
Hot waste gases (recycled to heat furnace)
Blasts of hot airBlasts of hot air
Molten iron
YouTube - Steelmaking: Blast Furnace
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More reactive metals?
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Electrolysis of aluminium oxide
CO2
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Let’s extract a metal!
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Carbon + copper oxide copper + carbon dioxide
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Today’s lessonUses of metals
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Gold
Unreactive, malleable and a good conductor of electricity
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Gold
Unreactive, malleable and a good conductor of electricity
Jewelry, wires in computers, gold leaf
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Aluminium
Light, and a very unreactive oxide layer forms over the reactive metal means it does not corrode
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Aluminium
Light, and a very unreactive oxide layer forms over the reactive metal means it does not corrode
Aircraft, cars, cutlery etc.
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Steel (mainly iron)
Strong, fairly cheap.
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Steel (mainly iron)
Strong, fairly cheap.
Building
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Copper
Ductile, unreactive and a good conductor
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Copper
Ductile, unreactive and a good conductor
Saucepans, wires etc.
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Let’s go for a walk!
Looking for uses of metals
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Reading?!
Pages 84 and 85
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Next topic?