chemistry unit one section 2.3

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when metals are mixed they create?
alloys
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metal ores are obtained by?
by mining this includes digging up and processing large amounts of rock.
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social, economical and environmental impact of exploiting metal ores?
money in but taken out by use of electricity, provides more jobs for locals but affects their lifestyle and health, scars the environment and pollutes but metal is extracted and used for initial purpose, selling allows our country's wealth to go up.
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benefits, drawbacks and risk of using metal as structural materials?
benefit would be stronger structures, drawbacks are its look ugly and reduces land prices, risk would be natural effect on the structure through erosion and rusting.
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un-reactive metals are found as metals such as gold but more reactive metals are found as what?
found as compounds that require chemical reactions to be extracted.
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metals less reactive than carbon can be extracted by?
can be extracted from their oxides by REDUCTION through a blast furnace.
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metals more reactive than carbon can be extracted by?
can be extracted by ELECTROLYSIS of molton compounds, so need to be molten in order to be extracted making them more expensive.
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what is Phytomining?
it is a process that uses plants to absorb the metal compounds, the plant is then burned to produce ash which contains that metal compound. it is an alternative to traditional mining.
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what is Bioleaching?
it is a process which uses bacteria to produce leachate solutions that contain metal compounds
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aluminium and titanium cannot be extracted from their oxides by reduction with carbon. current methods are expensive, why?
there are many stages and large amounts of electricity is needed.
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we should recycle metals because...
the resource is limited and its and expensive process
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iron from the blast furnace contains what percentage of iron?
96%, the impurities make it brittle and so it has limited uses.
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blast furnace iron being used as...
cast iron because its stronger in compression.
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most iron is converted into... and why?
steel, because it has modified properties for a specific use.
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low- carbon steels are...opposed to high-carbon steels
low-carbon steels are easily shaped and bendable, whereas high-carbon steels are hard, stainless steels are risitant to corrosion
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what are the elements in the central block of the table called?
Transition metals
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copper is a...
good conductor, can be bent easily, and reactions are slow.
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aluminium and titanium are...
low in density and naturally resistant to corrosion, good for large ships.
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CuO is a gold oxide, PbO is a silver oxide, Fe2O3 is a two copper and 3 oxygen oxide. when we react these with carbon what do we get?
the oxide changes to a carbonate. when we heat the carbonate say a coper carbonate we get a copper
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complete equation copper carbonate plus charcoal equals...
copper
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Card 2

Front

metal ores are obtained by?

Back

by mining this includes digging up and processing large amounts of rock.

Card 3

Front

social, economical and environmental impact of exploiting metal ores?

Back

Preview of the front of card 3

Card 4

Front

benefits, drawbacks and risk of using metal as structural materials?

Back

Preview of the front of card 4

Card 5

Front

un-reactive metals are found as metals such as gold but more reactive metals are found as what?

Back

Preview of the front of card 5
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