Q16 of 56 Page 82

Explain giving a suitable example:

Law of conservation of mass.

Law of conservation of mass:


This law states that “atoms are neither created nor destroyed in a chemical reaction”. This means that the total mass of the products formed in a chemical reaction must be equal to the mass of reactants consumed.


For example:



Sum of mass of reactants = Sum of masses of products


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14

What is meant by:

(a) Molecular mass


(b) Chemical formula


(c) Mole

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Give the main postulates of Dalton ’s atomic theory.

 16

Explain giving a suitable example:

Law of constant proportions.

 17

Give the formula of the following compounds:

(i) Magnesium bicarbonate.


(ii) Cupric oxide.


(iii) Ferric oxide.


(iv) Ammonium hydroxide.


(v) Calcium carbonate.


(vi) Potassium carbonate.