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In an experiment magnesium ribbon was heated in air. The product was found to be heavier than the original ribbon. Potassium manganate 7 was on the other hand, heated in air and product formed was to be lighter. Explain the difference on the observation made

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Burning a magnesium ribbon in the air is an addition reaction while heating potassium manganate 7 is a decomposition reaction.

Addition and decomposition reactions

Magnesium burns in air to produce magnesium oxide as follows:

[tex]2Mg + O_2 --- > 2MgO[/tex]

Potassium manganate 7 burns to produce multiple products as follows:

[tex]2 KMnO_4 --- > K_2MnO_4 + MnO_2(s) + O_2[/tex]

Thus, the MgO will be heavier than Mg. On the other hand, [tex]MnO_2[/tex] will be less heavy than [tex]KMnO_4[/tex].

More on reactions can be found here: https://brainly.com/question/17434463

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