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.
(i) Iron is extracted from its ore by heating the ore with ____________.
(ii) It is difficult to reduce alu... 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
It is difficult to reduce aluminium ore to aluminium metal. Therefore, 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 equation, lead oxide loses oxygen as it is converted to lead, indicating that lead oxide is reduced. Conversely, the carbon gains oxygen from the lead oxide, meaning the carbon is oxidised.
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 used for overhead power cables instead of copper because both metals are good conductors of electricity, but aluminium has a lower density. This makes aluminium lighter, allowing for easier installation of cables supported by pylons.
Step 5
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
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 and reaches a minimum point at around 60% tin before gradually increasing again. This indicates the presence of an eutectic point in the alloy.
