Q6 of 37 Page 4

What do the symbols (aq) and (s) indicate in a balanced chemical equation?

These symbols refer to the phase of reactants and products which take part in the reaction. (aq) represents aqueous phase which means that this substance is in dissolved in water. (s) represents solid phase.


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4

Balance the following chemical equations:

(i) Mg(OH)2 + HCl → MgCl2 + H2O


(ii) N2 +H2→ NH3


(iii) P4+O2 → P2O5

 5

Which of the following reactions is balanced, A or B?

A : 2NaCl+ 2H2O 2NaOH + 2Cl2 + H2


B : Ca(OH)2 + Cl2→ CaOCl2 + H2O

 1

Identify the type of reaction:

(i) CH4(g) + 2O2(g) → CO2(g)+ 2H2O(g)


(ii) 2NaCI(l) 2Na(s) + Cl2(g)


(iii) MnO2 + 4HCI MnCl2 + 2H2O+ Cl2

 2

What happens when hydrogen gas is added to copper oxide?