Question

Can any one give me notes of class 9th chapter 5 why do we fall ill .
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Answer 1

It may be caused due to the attack of pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services. The disease which lasts for only a short period of time is called Acute Disease. For example: Influenza (Flu), Common cold, etc.

Answer 2

(a) Applications of Avogadro’s Law :

It explains Gay-Lussac’s law.

It determines atomicity of the gases.

It determines the molecular formula of a gas.

It determines the relation between molecular mass and vapour density.

It gives the relationship between gram molecular mass and gram molecular volume.