What do you understand by atom and molecule? from Chemistry Som

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 Multiple Choice QuestionsLong Answer Type

131.

How Dalton's atomic theory was modified on the basis of modern reseraches? or Give various postulates of modern atomic theory.

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132.

What do you understand by atom and molecule?


Atom: Atom is the smallest particle of an element which may or may not have independent existence. For example, the atoms of hydrogen are not capable of independent existence while the atoms of neon gas are capable of independent existence. Atoms take part in chemical combination and remain as indivisible.

Molecule: Molecule is the smallest particle of a substance (element or compound) which is capable of independent existence. The molecules are formed by the combination of two or more atoms. In case the atoms happen to be the same, the molecules are called homoatomic molecules (e.g. O2, N2, H2 etc.). In case atoms happen to be different, the molecules are known as heteroatomic molecules (e.g. NH3, CO2, SOetc.).

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133.

What is the difference between molecule of an element and molecule of a compound?

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134.

Define Avogadro’s law. Taking a suitable example, prove that it is not in contradiction with Dalton’s atomic theory.

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135.

Explain breifly the present state of Atomic-Molecular theory of matter.

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 Multiple Choice QuestionsShort Answer Type

136.

Define the following:
Precision and accuracy

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137.

Define the following:
Unit factor

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138.

Define the following:

Average atomic mean.

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 Multiple Choice QuestionsLong Answer Type

139.

What do you understand by:
(i) Atomic Mass?
(ii) Gram atomic mass(gram-atom)?

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 Multiple Choice QuestionsShort Answer Type

140.

Calculate the atomic mass(average) of chlorine using the following data:

   %Natural Abundance   Molar mass 
35Cl   75·77    34·9689
37Cl   24·23  36·9659

          
                                                            
                                                              

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