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Card 6
Front
What is needed for hardening?
Back
Card 7
Front
Conditions to crack?
Back
Card 8
Front
Copper is now extracted form ores containing low percentages of copper compounds, why?
Back
Card 9
Front
Suggest a reason why it is difficult to dispose of waste rock.
Back
Card 10
Front
The extraction of pure copper is expensive, why?
Back
Card 11
Front
How does photomining remove copper compounds?
Back
Card 12
Front
Name a type of reaction that releases energy from a fuel?
Back
Card 13
Front
Fuels react with oxygen to produce co2. The reaction of a fuel with oxygen can produce another type of carbon. How and what is it?
Back
Card 14
Front
Give one advantage and one disadvantage of recycling a pen.
Back
Card 15
Front
Why are alloys used to make ballpoint pens?
Back
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