This question is about the corrosion of metals - AQA - GCSE Chemistry - Question 4 - 2019 - Paper 2
Question 4
This question is about the corrosion of metals.
The corrosion of iron is called rusting.
A student investigated the rusting of iron.
This is the method used.
1. Set... show full transcript
Worked Solution & Example Answer:This question is about the corrosion of metals - AQA - GCSE Chemistry - Question 4 - 2019 - Paper 2
Step 1
Test tube 1: Explain what would happen to the nails
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Answer
In test tube 1, the iron nail will rust because it is exposed to both air (oxygen) and water, which are essential components for the rusting process. The presence of both these elements allows for the formation of iron oxide.
Step 2
Test tube 2: Explain what would happen to the nails
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Answer
In test tube 2, the iron nail does not rust because it is in dry air without water. Rusting cannot occur without moisture; hence the absence of water prevents any corrosion.
Step 3
Test tube 3: Explain what would happen to the nails
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Answer
In test tube 3, the iron nail will not rust because it is submerged in boiled water, which has had the oxygen removed. As rusting requires both oxygen and water, this lack of oxygen prevents corrosion.
Step 4
Test tube 4: Explain what would happen to the nails
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Answer
In test tube 4, the painted iron nail does not rust since the paint acts as a protective barrier against water and oxygen. This barrier significantly reduces exposure to the elements required for rusting.
Step 5
Test tube 5: Explain what would happen to the nails
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In test tube 5, the stainless steel nail does not rust because stainless steel is inherently resistant to corrosion due to the presence of chromium, which forms a protective layer that prevents rust.
