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Reaction of Metals with Oxygen (Burnt in Air)

A silvery-whi...

Question

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z.

(a) What could metal X be ?

(b) What is power Y ?

(c) With which substance metal X combines to form powder Y ?

(d) What is substance Z ? Name one domestic use of substance Z.

(e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.

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Solution

a) The silver metal X is magnesium (Mg).
b) When ignited, Mg is burnt in air to form powde Y that is magnesium oxide ( $M g O$ )
c) Mg reacts with oxygen to form $M g O$
d) When water is added to $M g O$ , it partially dissolve to form magnesium hydroxide ( $M g (O H)_{2}$ ). It is used as antacid to neutralise stomach acid.
e) Balanced chemical equation from X to Y.

$2 M g + O_{2} ⟶ 2 M g O$

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Q. A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z.
(a) What could metal X be?
(b) What is powder Y?
(c) With which substance metal X combines to form powder Y?
(d) What is substance Z? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

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