end of year science

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what is an iron ore?
mainly HAEMATITE, iron oxide
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which metals DONT need extraction but instead are found pure in the ground?
silver and gold
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which metals can be extracted from there ores by a reduction in carbon?
zinc, iron and copper
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which metals are very reactive and can only be extracted using electrolysis?
potassium, sodium and alumnium
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what is electrolysis?
splitting using electricity
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which metals displace others in reactions?
the more reactive ones
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potassium+ iron oxide ->.....
potassium oxide + iron
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carbon can be used to extract some metals from their ores
the copper oxide has lost oxygen. this is called a reduction reaction
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copper oxide+carbon -> copper+carbon dioxide what has happened?
the copper oxide has lost oxygen. this is called a reduction reaction
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what is coke?
a cheap form of carbon , made from coal
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what is limestone used for in a blast furnace?
to get rid of sandy waste (impurities)
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what is hot air in a blast furnace used for?
turns the iron molten so that impurities run off
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what does the limestone in a blast furnace react with to make ****?
impurities from the iron
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what is **** used for?
making roads
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what is bauxite?
aluminium oxide (Al2O3)
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what is malachite?
copper carbonate (C3CO3)
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what is haematite?
iron oxide (Fe2O3)
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what do metals most commonly bind with to create ores?
oxygen or sluphur
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what is the symbol equation for limestone?
CaCO3
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what is the chemical name for limestone?
calcium carbonate
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what happens when limestone is broke down my thermal decomposition?
the products formed are calcium oxide and carbon dioxide
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what is another name for calcium oxide?
quicklime
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what does quicklime create when water is added? and what is its use?
slaked lime. this is used to raise the pH of acidic soil
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how is glass formed?
by heating a mixture of lime stone sand and sodium carbonate
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what are some of the reactions of limestone?
CaCO3 (calcium carbonate) , CaO (calcium oxide) , CO2 (carbon dioxide) , Ca(OH)2 (calcium hydroxide) and CaHCO3 (calcium bicarbonate)
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what is the equation for thermal decomposition?
metal carbonate-heat>metal oxide+carbon dioxide
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name 2 reasons for quarrying limestone
brings jobs to the area and the limestone goes to cement factories to make cement which we use a lot
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two reasons against quarrying limestone
quarrys can destroy natural habitats and quarrying creates a lot of dust
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is a thermite reaction a commercially viable way of extracting iron from its ore?
no- not eco friendly and is a waste of a lot of resources eg - limestone or coke
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Card 2

Front

which metals DONT need extraction but instead are found pure in the ground?

Back

silver and gold

Card 3

Front

which metals can be extracted from there ores by a reduction in carbon?

Back

Preview of the front of card 3

Card 4

Front

which metals are very reactive and can only be extracted using electrolysis?

Back

Preview of the front of card 4

Card 5

Front

what is electrolysis?

Back

Preview of the front of card 5
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