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 buns in air to form powder Y.

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Solution

a) Metal X is Magnesium (Mg).

b) Powder Y is Magnesium oxide, $(M g O) .$

c) The substance with which metal X combines to form powder Y is Oxygen (of air), $O_{2}$

d) Substance Z is Magnesium hydroxide $M g (O H)_{2}$ . Used as an antacid to relieve indigestion.

e) $2 M g + O_{2} \to 2 M g O$
powder

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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 ?

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a) Metal X is Magnesium (Mg).b) Powder Y is Magnesium oxide, (MgO).c) The substance with which metal X combines to form powder Y is Oxygen (of air), O2d) Substance Z is Magnesium hydroxide Mg(OH)2. Used as an antacid to relieve indigestion.e) 2Mg+O2→2MgO powder