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Metals and their uses
Terms in this set (25)
What is an ore?
Rock from which metal can be extracted economically
Name two metals that have oxides that can be reduced by carbon?
Two metals from those below carbon in the reactivity series, eg zinc, iron, tin, lead, copper
What do we call the removal of oxygen from a metal oxide?
Why does iron from the blast furnace have only a few uses?
It is brittle
Why are steels more useful than pure iron?
They are harder, can be made with specific properties, can be made to resist corrosion
Why is it expensive to extract aluminium form its ore?
It requires a lot of energy for high temperatures and electricity
Why is titanium a very useful metal for making aircraft engines?
It is strong, resists corrosion, has a low density
Why are new ways of extracting copper being researched?
High grade ores are limited or running out, to reduce environmental impacts
What three ways can be used to produce copper metal from its compounds?
Smelting, electrolysis, displacement
What properties make transition metals useful materials for making things?
strong, good conductors of heat and electricity, can be bent and hammered into shape
What properties are needed for electrical wiring?
Good conductor of electricity, can be made into wires, can be bent into shape, resistant to corrosion
Why is the gold used for wedding rings mixed with other metals?
To make it harder
Why should we recycle aluminium cans?
To save the energy needed to extract it from its ore, resources, fossil fuels, land needed for mining and/or landfill, other specified environmental impact
Use the information in this chapter to explain the benefits and drawbacks of using steel for girders in buildings
Benefits: e.g strong, not brittle, can be shaped, can be cut or joined or welded. Drawbacks e.g needs protection from corrosion, heavy/dense
What is the name for rock that is mined from which metal can be extracted economically?
Why is gold found in the earth as the metal?
It is very unreactive or very low in the reactivity series
What are the typical properties of 'transition metals?'
strong, good conductors of heat and electricity, can be bent and hammered into shape.
Explain why most of the metals we use are not pure elements
Most pure metals are too soft for many uses, they need to be made harder by alloying
Describe a reaction that is used to get iron from iron oxide. Write a word equation for the reaction.
iron oxide is reduced by carbon when heated together. iron oxide + carbon -> iron + carbon dioxide
Name three types of steel and give an important property for each one.
Low carbon steel or mild steel, easily shaped; high carbon steel, hard; stainless steel, resists corrosion
Explain why all steels are alloys
All steels contain iron and carbon, so are mixtures of metal of a metal with at least one other element
Give three properties that make aluminium a useful metal
Low density, resists corrosion, good conductor of heat
Give three reasons why titanium is expensive
Extraction need several stages, uses a large amount of energy, uses a very reactive metal
Suggest three reasons why we should recycle iron and steel
To save iron ore or reduce ironing, to save energy or fossil fuels needed for extraction, to reduce waste going to landfill
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