Allied solutions

Allied solutions

Grade 8

Atomic Structure | Exercise

Question 1

Q1) State the main postulates of Dalton’s atomic theory. Explain how the modern atomic theory contradict Dalton’s atomic theory.

Solution :

The main postulates of Dalton’s atomic theory are:

  1. The matter is made up of indivisible particles known as atoms.
  2. The properties of all the atoms of a given element are the same including mass. This can also be stated as all the atoms of an element have identical mass while the atoms of different elements have different masses.
  3. Atoms of different elements combine in fixed ratios to form compounds.
  4. Atoms are neither created nor destroyed. This implies that during chemical reactions, no atoms are created nor destroyed.
  5. The formation of new products (compounds) results from the rearrangement of existing atoms (reactants).
  6. Atoms of an element are identical in mass, size and many other chemical or physical properties, but atoms of two-different elements differ in mass, size, and many other chemical or physical properties.

The modern atomic theory contradicts dalton’s atomic theory :

  1. Atoms are divisible into protons, neutrons, electrons.
  2. Atoms of the same element have different properties, such atoms are isotopes.
  3. Atoms of different elements have the same properties, such atoms are isobars.
  4. Atoms can combine in any ratio and not just whole numbers. Example - Sugar C12H22O11
  5. Atoms can be destroyed and converted into energy.

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Question 1

Q1) State the main postulates of Dalton’s atomic theory. Explain how the modern atomic theory contradict Dalton’s atomic theory.

Solution :

The main postulates of Dalton’s atomic theory are:

  1. The matter is made up of indivisible particles known as atoms.
  2. The properties of all the atoms of a given element are the same including mass. This can also be stated as all the atoms of an element have identical mass while the atoms of different elements have different masses.
  3. Atoms of different elements combine in fixed ratios to form compounds.
  4. Atoms are neither created nor destroyed. This implies that during chemical reactions, no atoms are created nor destroyed.
  5. The formation of new products (compounds) results from the rearrangement of existing atoms (reactants).
  6. Atoms of an element are identical in mass, size and many other chemical or physical properties, but atoms of two-different elements differ in mass, size, and many other chemical or physical properties.

The modern atomic theory contradicts dalton’s atomic theory :

  1. Atoms are divisible into protons, neutrons, electrons.
  2. Atoms of the same element have different properties, such atoms are isotopes.
  3. Atoms of different elements have the same properties, such atoms are isobars.
  4. Atoms can combine in any ratio and not just whole numbers. Example - Sugar C12H22O11
  5. Atoms can be destroyed and converted into energy.

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your chemistry exam ?

Learn from an expert tutor.

Book a free class now
subject-cta
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