Question

Metal X burns with a dazzling white flame to form a substance Y. Substance Y reacts with water to form Z which turns red litmus paper blue.
a) Identify and name X, Y and Z.
b) What is the nature of compound Z?
c) What type of change is this? Justify your answer.
d) Write down the word equations for the reactions involved.
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Answer 1

Answer:

X is magnesium

Explanation:

X =Magnesium

Y = Magnesium Oxide

Z =Magnesium Hydroxide

Answer 2

Answer:

Concept behind this whole reaction:

A magnesium strip burns in the air with a dazzling white flame and produces MgO as white ash. If the magnesium is left in the flame, though, it continues to burn, albeit poorly (it sputters), while the flame above it turns yellow-orange. Because of an oxidation reaction that occurs when burning magnesium ribbons in the presence of air, magnesium oxide is produced. We observe the brilliant white flame as a result of this shift, which occurs with the evolution of heat and light.

a) X = Metal X is  Magnesium (Mg).

   Y = Powder Y is Magnesium oxide, (MgO).

   Z = Substance Z is Magnesium hydroxide $Mg(OH)_{2}$

b) Magnesium hydroxide $Mg(OH)_{2}$, or , is substance Z. used as an       antacid to treat heartburn.

c) We witness the brilliant white flame as a result of this shift, which is accompanied by the evolution of heat and light.

d) 2 Mg + $O_{2}$ → 2 MgO

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