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GCSE
Gcse Science
Chemistry - Calcium Carbonate (Aqa)
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Q.1
Some students heated pieces of limestone in a roaring flame of a bunsen burner. What would they have observed as the reaction was taking place?
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The limestone spitting and popping
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The limestone glowing red hot
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The limestone expanding at first, then going smaller
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The limestone glowing with an intense white light
Q.2
Calcium carbonate is heated with which of the following substances to make cement?
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Sand
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Clay
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Aggregate (gravel and small pebbles)
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All of the above
Q.3
Heated limestone was left to cool and when it was cold a few drops of water were added to it. Then a piece of moist litmus paper was touched against it. What was observed?
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The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned red.
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The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned blue.
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The piece of heated limestone turned pale yellow and the litmus paper stayed the same.
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Nothing happened and the litmus paper stayed the same.
Q.4
A student added some nitric acid to a small quantity of powdered calcium carbonate in a large beaker. Which of the following would have been observed during the experiment?
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Brown fumes of nitric oxide
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The calcium carbonate frothed up
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The calcium carbonate disappeared
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A fizzing noise was heard
Q.5
What are the products when calcium carbonate thermally decomposes?
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Calcium and oxygen.
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Calcium and carbonate.
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Calcium oxide and oxygen.
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Calcium oxide and carbon dioxide.
Q.6
What is the formula of calcium carbonate?
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CaC3
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CaCO2
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CaCO3
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Ca3CO
Q.7
Which of the following statements about limestone is false?
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It reacts with acid rain and is gradually eroded
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It is used for making the foundations of roads
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It is used in the manufacture of cement
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It is not used in agriculture
Q.8
Which of the following terms best describes calcium oxide?
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Calcium oxide is an acid
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Calcium oxide is a base
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Calcium oxide is neutral
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Calcium oxide is a salt
Q.9
Calcium oxide is slightly soluble in water and can be used for testing for a gas. What is the gas and what happens to the solution if the gas is present?
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Hydrogen is the gas and the solution goes blue
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Oxygen is the gas and the solution gives a green precipitate
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Nitrogen is the gas and the solution turns a pale straw colour
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Carbon dioxide is the gas and the solution goes cloudy
Q.10
When calcium carbonate is strongly heated what does it do?
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It thermally decomposes
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It optically decomposes
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It mentally decomposes
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It does nothing
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