Q10 of 49 Page 19

A change in the physical state can be brought about

A change in the physical state can be brought about when energy is either given to or taken out from the system. Without any providing any energy to the system, there can be no physical change seen in the system.

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8

Mass of one atom of oxygen is

 9

3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are

 11

Which of the following represents a correct chemical formula? Name it.

(a) CaCl


(b) BiPO4


(c) NaSO4


(d) NaS

 12

Write the molecular formulae for the following compounds

(a) Copper (II) bromide


(b) Aluminium (III) nitrate


(c) Calcium (II) phosphate


(d) Iron (III) sulphide


(e) Mercury (II) chloride


(f) Magnesium (II) acetate