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) Iron is extracted from its ore by heating the ore with ____________.
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Answer
Iron is extracted from its ore by heating the ore with carbon.
Step 2
(ii) It is difficult to reduce aluminium ore to aluminium metal. Therefore,
to produce aluminium from its ore, it is necessary to use ____________.
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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 reaction, lead oxide loses oxygen to become lead, indicating that lead oxide is reduced. Conversely, carbon gains oxygen to form carbon dioxide, showing that 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 rather than copper because it has a lower density compared to copper. This makes aluminium cables lighter, which is advantageous for support systems like pylons.
Step 5
Complete the sentence by putting a cross (X) in the box next to your answer.
Stainless steel is an alloy containing iron and chromium.
Stainless steel is often used instead of pure iron because it is
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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, reaching a minimum before rising again. This indicates an optimal composition for melting point reduction.
