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A student investigated the effect of heat on four metal carbonates - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Question 6
A student investigated the effect of heat on four metal carbonates. Equal amounts of each carbonate were heated strongly, in the same way, in this apparatus. The ti... show full transcript
Worked Solution & Example Answer:A student investigated the effect of heat on four metal carbonates - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Step 1
Explain why it was important not to remove the heat from the test tube while the delivery tube was still in the limewater.
Answer
It is important to keep the heat in the test tube while the delivery tube is still in the limewater because, as the gas cools down, it contracts. If the heat is removed before the delivery tube is taken out, the limewater might suck back any liquid or gas into the test tube, preventing an accurate measurement.
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Step 5
By describing uses of these three calcium compounds, explain why limestone is such an important raw material.
Answer
Limestone, mainly composed of calcium carbonate, is significant in various industries. One key use is in construction, where it is employed to make cement and concrete. These materials are essential in building infrastructure such as roads and bridges.
Additionally, limestone is critical in the production of calcium oxide, which is used in steelmaking and treating acidic soils, enhancing agricultural productivity. Furthermore, calcium hydroxide, derived from calcium carbonate, plays an important role in water treatment processes and is used to produce limewater for laboratory experiments.
This versatility makes limestone a vital raw material in many applications, contributing to its importance in both the construction and manufacturing sectors.