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Calcium carbonate is the main chemical in chalk and limestone.
Chemistry - Calcium Carbonate
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The various different building materials, such as limestone and metals, is one of the Science topics looked at in high school. This quiz looks in particular at calcium carbonate, commonly found in limestone and chalk.
1 .
When calcium carbonate is strongly heated what does it do?
It thermally decomposes
It optically decomposes
It mentally decomposes
It does nothing
When a chemical is heated on its own and breaks down to form new materials, it is always called 'thermal decomposition'
2 .
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?
The limestone spitting and popping
The limestone glowing red hot
The limestone expanding at first, then going smaller
The limestone glowing with an intense white light
This is called 'limelight' and was once used to provide lighting for the stages in theaters, hence the expression 'being in the limelight'
3 .
What are the products when calcium carbonate thermally decomposes?
Calcium and oxygen.
Calcium and carbonate.
Calcium oxide and oxygen.
Calcium oxide and carbon dioxide.
This is the basis of the cement making process
4 .
What is the formula of calcium carbonate?
CaC3
CaCO2
CaCO3
Ca3CO
We know from its name that calcium carbonate contains calcium, carbon and oxygen, so we can rule out option 1. Limestone and chalk are mainly CaCO3
5 .
A student added some nitric acid to a small quantity of powdered calcium carbonate in a large beaker. Which of the following would not have been observed during the experiment?
Brown fumes of nitric oxide
The calcium carbonate frothed up
The calcium carbonate disappeared
A fizzing noise was heard
Calcium carbonate reacts with the common laboratory acids. It neutralizes the acid and gives off carbon dioxide
6 .
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?
The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned red.
The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned blue.
The piece of heated limestone turned pale yellow and the litmus paper stayed the same.
Nothing happened and the litmus paper stayed the same.
This process of adding water to calcium oxide is called 'slaking'
7 .
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?
Hydrogen is the gas and the solution goes blue
Oxygen is the gas and the solution gives a green precipitate
Nitrogen is the gas and the solution turns a pale straw color
Carbon dioxide is the gas and the solution goes cloudy
An easy question, but, if we had said the solution was limewater, the question would have been just too easy
8 .
Which of the following statements about limestone is false?
It reacts with acid rain and is gradually eroded
It is used for making the foundations of roads
It is used in the manufacture of cement
It is not used in agriculture
Farmers use it to neutralize slightly acidic soil
9 .
Which of the following terms best describes calcium oxide?
Calcium oxide is an acid
Calcium oxide is a base
Calcium oxide is neutral
Calcium oxide is a salt
Oxides of metals are usually bases. If a base dissolves in water, it forms an alkali
10 .
Calcium carbonate is heated with which of the following substances to make cement?
Sand
Clay
Aggregate (gravel and small pebbles)
All of the above
The catch here was to include sand and aggregate. Often in everyday life, people talk about cement when they really mean mortar (sand and cement) or concrete (sand, cement and aggregate)
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