Chemistry
(a) What is a decomposition reaction ?
(b) Decomposition reactions can occur by (i) heat (ii) electricity and (iii) sunlight.
Give two balanced reactions for each.
Chemical Reaction
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Answer
(a) The chemical reaction in which a compound splits into two or simpler substances (elements or compounds) is called decomposition reaction.
(b) Two balanced chemical equations for:
(i) Heat
2HgO (s) 2Hg (l) + O2 (g)
CaCO3 (s) CaO (s) + CO2 (g)
(ii) Electricity
2NaCl (l) 2Na (l) + Cl2 (g)
2H2O (l) 2H2 (g) + O2 (g)
(iii) Light
2AgCl (s) 2Ag (s) + Cl2 (g)
2H2O2 (l) 2H2O (l) + O2 (g)
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(b) What kind of chemical reaction is synthesis? Support your answer with an example.
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Solution to which metal is added
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(b) Give a balanced equation for this reaction.
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