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 that is formed from the accumulation of organic and inorganic materials, such as shells, coral, and algae.
Step 2
Explain how the marble has formed above the granite.
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Answer
Marble forms from the metamorphosis of limestone under heat and pressure. In this case, the granite, which also originated from molten rock, was able to exert the necessary heat and pressure onto the nearby limestone, transforming it into marble.
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 slowly, allowing more time for the crystals to grow larger. In contrast, the rock at Y cooled quickly, which resulted in smaller crystals because the minerals did not have sufficient time to crystallize into larger forms.
Step 4
Complete the equation for this reaction.
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Answer
The complete equation 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 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 to neutralize acidic soils. By doing this, it helps to improve soil fertility, providing a better environment for plant growth. It also enhances the availability of nutrients to plants.
