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6. Some metals are found in the Earth’s crust as uncombined elements - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Question 6
6. Some metals are found in the Earth’s crust as uncombined elements. Reactive metals are found in ores. In ores, metals are combined with other elements. (a) Which ... show full transcript
Worked Solution & Example Answer:6. Some metals are found in the Earth’s crust as uncombined elements - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Step 1
Step 2
Give two advantages of recycling metals rather than extracting metals from their ores.
Answer
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Recycling metals saves natural resources and reduces the need to mine new ores, which can be environmentally damaging.
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Recycling metals uses significantly less energy compared to extracting metals from ores, leading to lower greenhouse gas emissions.
Step 3
Step 4
Calculate the percentage of copper in this ore.
Answer
To find the percentage of copper in the ore, use the formula:
ext{Percentage of copper} = rac{ ext{Mass of copper}}{ ext{Mass of ore}} imes 100
Given that the mass of copper is 42.5 kg and the mass of the ore is 5000 kg, we can substitute:
ext{Percentage of copper} = rac{42.5 ext{ kg}}{5000 ext{ kg}} imes 100 = 0.85 ext{%}