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 the uncombined element in the Earth’s crust is B: gold.
Step 2
Give two advantages of recycling metals rather than extracting metals from their ores.
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Answer
Environmental Benefits: Recycling metals reduces the need for mining new ores, which can harm ecosystems and lead to habitat destruction.
Energy Savings: It generally consumes less energy to recycle metals than to extract and process them from ores, resulting in lower greenhouse gas emissions.
Step 3
Balance this equation for the reaction that takes place.
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Answer
The balanced equation for the reaction of iron oxide with carbon is:
ightarrow 4Fe + 3CO_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:
extPercentageofcopper=(mass of oremass of copper)×100
Plugging in the values:
Percentage of copper=(5000extkg42.5extkg)×100=0.85%
