This question is about the metal gold - Edexcel - GCSE Chemistry - Question 7 - 2021 - Paper 1
Question 7
This question is about the metal gold.
(i) Gold can be hammered into shape.
State the name of this property.
(ii) Gold alloys can be used to repair teeth.
One reas... show full transcript
Worked Solution & Example Answer:This question is about the metal gold - Edexcel - GCSE Chemistry - Question 7 - 2021 - Paper 1
Step 1
State the name of this property.
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Answer
The property of gold that allows it to be hammered into shape is known as 'malleability.'
Step 2
Give one other reason why gold alloys are used to repair teeth.
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Answer
Gold alloys have a high resistance to corrosion, making them suitable for dental applications.
Step 3
Calculate the mass of gold in 2.00 kg of this alloy.
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Draw one straight line from each hazard symbol to its meaning.
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Answer
Corrosive - Hazard Symbol 1
Flammable - Hazard Symbol 2
Hazardous to the Environment - Hazard Symbol 3
Oxidising - Hazard Symbol 4
Step 5
Explain the observations and give reasons why the masses after heating are less than expected.
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Answer
When heated, some copper can oxidize, forming copper oxide and resulting in a loss of mass due to gas or particulate loss. The copper powder has a larger surface area exposed, increasing the rate of reaction with oxygen, which may lead to a greater increase in mass of copper oxide formed compared to the bulk copper pieces, potentially explaining discrepancies in mass after heating.
