Chemistry
Give reasons for the following:
Soda-acid and foam-type of fire extinguishers are not used for extinguishing electrical fires.
Carbon dioxide
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Answer
In both soda-acid and foam-type of fire extinguishers, the solutions are prepared in water which conducts electricity. As a result it might generate an electric shock leading to short circuit and another fire.
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An excess of carbon dioxide increases the temperature of the earth.
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Solid carbon dioxide is used for the refrigeration of food.
(a) Name the chemicals required for the preparation of carbon dioxide in the laboratory.
(b) Write the balanced chemical equation for the preparation of CO2 in the laboratory.
(c) How will you collect CO2 gas in the laboratory?
(d) Draw a labelled diagram for the preparation of CO2 in the laboratory.
(e) Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory?
(f) Give a chemical test for carbon dioxide.