Some metals are found in the Earth's crust as uncombined elements - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Question 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 o... show full transcript
Worked Solution & Example Answer:Some metals are found in the Earth's crust as uncombined elements - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Step 1
Which of these metals is found as the uncombined element in the Earth’s crust?
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Answer
The metal that is found as an uncombined element in the Earth's crust is gold (B). Gold is one of the few metals that occurs in nature in a native state.
Step 2
Give two advantages of recycling metals rather than extracting metals from their ores.
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Answer
Recycling metals conserves natural resources as it reduces the need for mining, which can harm the environment.
Recycling metals saves energy, as processing recycled metal usually consumes less energy compared to extracting and processing ores.
Step 3
Balance this equation for the reaction that takes place.
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Answer
The balanced equation is:
ightarrow 4 ext{Fe} + 3 ext{CO}_2$$
Step 4
Calculate the percentage of copper in this ore.
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Answer
To calculate 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
