Question

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Answer 1

1. (i) 3 atoms because H2S molecule has two atoms of hydrogen and one atom of sulphur.

(ii) 5 atoms because PO43- ion has one atom of phosphorus and four atoms of oxygen.

2. a) Quick lime is CaO. Elements present are calcium and oxygen. (b) Hydrogen bromide is HBr. Elements present are hydrogen and bromine.

b) Elements present are calcium and oxygen. (b) Hydrogen bromide is HBr. Elements present are hydrogen and bromine.

c) Baking powder is sodium carbonate, that is NaHCO3. The elements present in it are sodium, hydrogen, carbon and oxygen. d) Potassium sulphate is K2SO4. Its elements are potassium, sulphur and oxygen.

d) The elements present in it are sodium, hydrogen, carbon and oxygen. d) Potassium sulphate is K2SO4. Its elements are potassium, sulphur and oxygen.

3. The law of the conservation of mass, in which mass before reaction has to equal mass after reaction. The law of constant proportions, in which the ratio mass for the same compound is constant. The law of multiple proportions, in which multiple elements can combine with each other in multiple ratios; and finally.

4.i) MgCl2 ii) CaO iii) AlCl₃ 4. CaCO3

5. When the milk is left open at room temperature, its taste changes and becomes sour due to the breakdown of lactose into lactic acid because of the lactic acid bacteria which also lower the P

H

of the milk due to the formation of lactic acid.

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