Q5 of 64 Page 112

Write true or false for the following statements:

In a chemical substance, the elements are always present in varying proportions by mass.

False

According to the postulates of Dalton’s atomic theory atoms of different elements combine in fixed ratios by mass to form compounds. So, in chemical substance, the elements are always present in fixed proportions by mass.


Hence, the above statement is false.


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3

Write true or false for the following statements:

Atoms combine in the ratio of small whole numbers to form compounds.

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Write true or false for the following statements:

In water, the ratio of the mass of hydrogen to the mass of oxygen is always 1:8, whatever is the source of water.

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Write true or false for the following statements:

One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.

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Write true or false for the following statements:

The relative atomic masses of all elements have been found with respect to an atom of oxygen-16.