Q3 of 55 Page 169

Write chemical equations of the reaction of magnesium metal with dioxygen gas, water, dilute hydrochloric acid and dichlorine gas.

Reaction of magnesium are as follows:

i) Dioxygen gas: Magnesium reacts with dioxygen gas to form magnesium dioxide.


2Mg(s) + O2(g) 2MgO(s)


ii) Water: Magnesium reacts with hot water to form magnesium hydroxide and dihydrogen gas.


Mg(s) + H2O(l) Mg(OH)2(aq) +H2(g)


iii) Dilute HCl: When magnesium reacts with dilute HCl magnesium chloride and dihydrogen gas is formed.


Mg(s) + HCl(aq) Mg(Cl)2(aq) +H2(g)


iv) Dichlorine gas: Magnesium reacts with dichlorine gas to form magnesium chloride.


2Mg(s) + Cl2(g) Mg(Cl)2(s)


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