3 (a) Use words from the box to complete the sentences - Edexcel - GCSE Chemistry - Question 3 - 2013 - Paper 1
Question 3
3 (a) Use words from the box to complete the sentences.
electricity
copper
carbon
methane
water
(i) Iron is extracted from its ore by heating the ore with ________... show full transcript
Worked Solution & Example Answer:3 (a) Use words from the box to complete the sentences - Edexcel - GCSE Chemistry - Question 3 - 2013 - Paper 1
Step 1
Use words from the box to complete the sentences (i)
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Answer
Iron is extracted from its ore by heating the ore with carbon.
Step 2
Use words from the box to complete the sentences (ii)
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Answer
To produce aluminium from its ore, it is necessary to use electricity.
Step 3
Explain how this equation shows that lead oxide is reduced and carbon is oxidised.
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Answer
In the reaction, lead oxide loses oxygen, which means it is reduced as it gains electrons. Conversely, carbon gains oxygen, indicating that it is oxidised as it loses electrons.
Step 4
Use the information from the table to explain why aluminium, rather than copper, is used for overhead power cables.
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Answer
Aluminium is chosen over copper for overhead power cables because it is a good conductor of electricity and has a lower density, making the cables lighter. This allows for easier installation and support by pylons.
Step 5
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
Stainless steel is used instead of pure iron because it is D more resistant to corrosion.
Step 6
Use the graph to find the percentage of tin in the mixture that has the lowest melting temperature.
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Answer
The percentage of tin in the mixture that has the lowest melting temperature is approximately 60%.
Step 7
Describe how the melting temperature changes as the percentage by mass of tin in the mixture increases.
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Answer
As the percentage by mass of tin in the mixture increases, the melting temperature initially decreases until it reaches the lowest point at around 60% tin, after which the melting temperature begins to rise again.
