Question

3.A silvery - white metal a taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form white powder B. when water is added to powder B, it dissolves partially to form another substance C. (3 marks) a) What could be metal A b) What is powder B c) Write balanced chemical equation of the reaction CA to B ​

Answer 1

ANSWER:

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), O2

d) Substance Z is Magnesium hydroxide Mg(OH) 2

. Used as an antacid to relieve indigestion.

. Used as an antacid to relieve indigestion.e) 2Mg+O 2 →2MgO

→2MgO (powder)