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Chemical Reactions and Equations
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02/09/2021 10:57 am
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(a) Give an example of an oxidation reaction.
(b) Is oxidation an exothermic or an endothermic reaction?
(c) Explain, by giving an example, how oxidation and reduction proceed side by side.
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02/09/2021 11:02 am
(a) Burning of magnesium ribbon in a dazzling flame of air (that is, oxygen) is an example of oxidation reaction.
The chemical reaction is given below:
2Mg(s) + O2(g) → 2MgO(s)
(b) Oxidation reactions are exothermic.
For example, the burning of hydrogen is an oxidation process in which hydrogen combines with oxygen to form water.
2H2(g) + O2(g) → 2H2O(l)
(c) Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously. The oxidation reaction is defined as the reaction in which a substance loses its electrons. The oxidation state of the substance increases. A reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
CuO + H2 + Heat → Cu + H2O
In this reaction, copper oxide is being reduced to copper whereas hydrogen is being oxidised to water.