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Home » (a) What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer. (b) Write a balanced chemical equation from the following information: An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.
(a) What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer. (b) Write a balanced chemical equation from the following information: An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.
CBSE | Chemical Reactions and Equations | Chemistry | Class 10 | Lakhmir Singh | Science
(a) What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer. (b) Write a balanced chemical equation from the following information: An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.

Answer:

(a) Ca(OH)2 (aq)+ CO2 (g)—3000°C →CaCO3(s)+H2O(l)

A chemical equation can be informative by

1) The chemical states of substances present in the reaction are denoted by (s) for solids, (l) for liquids, (g) for gases, and (aq) for aqueous solution in a chemical equation.
2) The temperature is written above the arrow.
3) Arrow upwards indicates that the chemical or any gas generated has escaped or been freed. 4)Arrow downwards indicates that precipitation has occurred.
5) Exothermic heat is written on the reactant side, while endothermic heat is written on the product side.

(b) Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l)

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