A student produced this sketch of a quarry face - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Question 4
A student produced this sketch of a quarry face.
(a) The limestone shown was originally formed in layers.
State what type of rock limestone is.
(b) Granite is ... show full transcript
Worked Solution & Example Answer:A student produced this sketch of a quarry face - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Step 1
State what type of rock limestone is.
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Answer
Limestone is a sedimentary rock.
Step 2
Explain how the marble has formed above the granite.
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Answer
Marble has formed from limestone that underwent metamorphism. The limestone, subjected to high temperatures and pressures, has changed physically and chemically to create marble. This transformation occurs due to the heat from the underlying granite, which is an igneous rock, facilitating the recrystallization of the limestone.
Step 3
Explain why the rock at X contained larger crystals than the rock at Y.
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Answer
The rock at X cooled slower than the rock at Y. This slower cooling process allows larger crystals to form, as the ions have more time to arrange themselves into a crystalline structure before solidification.
Step 4
Complete the equation for this reaction.
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Answer
The balanced equation for the decomposition of calcium carbonate is:
CaCO₃ → CaO + CO₂
Step 5
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction of calcium oxide with water to form calcium hydroxide is:
CaO + H₂O → Ca(OH)₂
Step 6
Explain why calcium hydroxide (slaked lime) is spread on fields.
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Answer
Calcium hydroxide is spread on fields because it acts as a soil conditioner. It neutralizes soil acidity, improving overall soil quality and promoting better growth conditions for crops by enhancing nutrient availability.
