Question

a) State any three findings of modem atomic theory.
b) Write down any two applications of Avogadro's law.

Answer 1

a) The findings of modern atomic theory are:

(i) Atom is considered to be divisible particle.
(ii) Atoms of the same element may not be similar in all respects
eg: Isotopes $C{l}_{17}^{35}$ and $C{l}_{17}^{37}$
(iii) Atoms of different elements may be similar in some respects.
eg: Isobars $C{l}_{40}^{18}$ and $C{l}_{40}^{20}$
(iv) Atom is the smallest particle which takes part in chemical reactions.

b) Applications of avagadro's law are:

• Determines the atomicity of the gas.
  
• Determines the molecular formula of the gas.
  
• Explains Gay lussac's law.