Question

Study the given word equation and answer the following question

i) Express the above word equation in the form of formula equation.
ii) write any two information that can be obtained from the given equation.
iii) name the factor that brings out chemical change in the above reaction.​

Answer 1

I) One (1) mol calcium carbonate put under thermal (heat) decomposition (heat at 825 Celsius) to produce one (1) mol of calcium oxide and one (1) mol carbon dioxide.
II) thermal decomposition is required; calcium oxide and carbon dioxide are the products which react under high heat (thermal decomposition) to form calcium carbonate (the reactant); exothermic reaction;
III) One mole of Calcium Carbonate [CaCO3] thermally decomposes into one mole of Calcium Oxide [CaO] and one mole of Carbon Dioxide [CO2]. Thermal decomposition (heat) brings about the chemical change in this reaction.

Balanced equation:

CaO + CO2 => CaCO3

Note: one mole of CaCO3 decomposes under heat to give one mole of CaO and one mole of C02. Because the reactant is equal to the product, the chemical equation is already fully balanced.

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