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 ... 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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Limestone is a sedimentary rock, as it was formed from layers of sediment over time.
Step 2
Explain how the marble has formed above the granite.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Marble has formed from limestone through a process called metamorphism. When limestone is subjected to heat and pressure, it changes into marble. Thus, the granite's underlying heat contributed to this transformation.
Step 3
Explain why the rock at X contained larger crystals than the rock at Y.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The rock at X cooled slowly, allowing larger crystals to form, while the rock at Y cooled quickly, resulting in smaller crystals.
Step 4
Complete the equation for this reaction.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The completed equation is:
ightarrow ext{CaO} + ext{CO}_2$$
Step 5
Write the balanced equation for this reaction.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
ightarrow ext{Ca(OH)}_2$$
Step 6
Explain why calcium hydroxide (slaked lime) is spread on fields.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Calcium hydroxide is spread on fields to neutralize soil acidity. It reacts with acids in the soil, improving the soil's pH and making it more suitable for plant growth.
