Q2 of 37 Page 4

State the law of conservation of mass.

“Mass can neither be created nor be destroyed in a chemical reaction”- This is known as the law of conservation of mass.


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1

What is the name given for the substance that reacts and forms in a chemical reaction?

 3

Write the skeletal equation and balanced equation for the following reaction:

Potassium bromide (aq) + Barium iodide (aq) → Potassium iodide (aq) + Barium bromide (s)

 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