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 an i... 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, formed from the accumulation of sediment and organic material over time.
Step 2
Explain how the marble has formed above the granite.
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Answer
Marble has formed from the metamorphism of limestone. The limestone undergoes heat and pressure over time, transforming it into marble. This process occurs due to proximity to the granite, which is an igneous rock that produces heat as it cools slowly beneath the Earth's surface.
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 contains larger crystals than the rock at Y because X cools slowly, allowing more time for crystal growth. In contrast, the rock at Y cools quickly, leading to smaller crystals.
Step 4
Complete the equation for this reaction.
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Answer
The decomposition of calcium carbonate upon heating can be represented as:
extCaCO3ightarrowextCaO+extCO2
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:
extCaO+extH2extOightarrowextCa(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 to neutralize acidic soils, improving soil quality for crop growth. It acts as a base, reacting with the acidity in the soil to create a more alkaline environment suitable for plants.
