Figure 9 shows the apparatus used to investigate the rusting of some iron nails - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Question 7
Figure 9 shows the apparatus used to investigate the rusting of some iron nails.
Explain why the iron nail in tube A would rust but the iron nails in tubes B and C ... show full transcript
Worked Solution & Example Answer:Figure 9 shows the apparatus used to investigate the rusting of some iron nails - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Step 1
Explain why the iron nail in tube A would rust
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Answer
The iron nail in tube A rusts because both air (oxygen) and water are present. Rusting occurs when iron reacts with oxygen in the presence of moisture, creating iron oxide, which is observed as rust.
Step 2
Discuss tube B
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Answer
In tube B, there is air present, but water is removed by the drying agent, preventing rusting. Without moisture, the rusting process cannot proceed.
Step 3
Discuss tube C
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Answer
Tube C contains boiled water, which means that any dissolved oxygen is largely absent due to the boiling process. Additionally, the presence of oil prevents air from coming into contact with the water, which further inhibits rusting.
