Fill in the blanks.

(a) In a compound the ………… do not retain their properties.

(b) In a ………… properties of constituents are retained.

(c) The chemical symbol of calcium is ………… .

(d) The molecular formula for carbon dioxide is ………… .

(e) The compound sodium chloride is made from the combination of the elements ………… and ………… .

(f) In the compounds H₂O, NaOH, H₂O₂, ………… are the common elements.

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Solution

(a) In a compound the atoms do not retain their properties.

(b) In a mixture properties of constituents are retained.

(c) The chemical symbol of calcium is Ca.

(d) The molecular formula for carbon dioxide is CO₂.

(e) The compound sodium chloride is made from the combination of the elements sodium and chlorine.

(f) In the compounds H₂O, NaOH, H₂O₂, hydrogen and oxygen are the common elements.

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Question 17
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(b) A compound cannot be separated into its constituent elements by physical methods of separation

(d) The ratio of atoms of different elements in a compound is fixed

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