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A silver meta...

Question

A silver metal X taken in the form of a ribbon,when ignited,burns in air with a dazzling white flame to form a white powder Y.when water is added to power Y , it dissolves partially to form another substance Z
a. what could metal X be??
b. what is powder Y?
c. with which substances metal X combines to form powder Y?
d. what is substance Z? name one domestic use of this substance?
e. write a balanced chemical equation of the reactions which take place when metal X burns in 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 (MgO)
c) Mg reacts with oxygen to form MgO
d) When water is added to MgO, it partially dissolve to form magnesium hydroxide (Mg(OH)₂). It is used as antacid to neutralise stomach acid.
e) Balanced chemical equation from X to Y.
2Mg + O₂ $\to$ 2MgO

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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?
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{MnO}_{2} + 4 HCl \underset{}{\to} {MnCl}_{2} + 2 H_{2} O + {Cl}_{2}

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