Question

We can easily break a piece of chalk but not an Iron nail. Justify.

Answer 1

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✔We can break a piece of chalk easily because particles of matter in a chalk are somewhat loosely packed. Though it is a solid but then also its particles are loosely packed and on application of force it easily breaks. 
While in the case of an iron piece, the particles of matter are very very tightly packed and it requires great great force to break it up into pieces.

I hope help. u✔

Answer 2

Answer:

We can break a piece of chalk easily because particles of matter in a chalk are somewhat loosely packed. Though it is a solid but then also its particles are loosely packed and on application of force it easily breaks. 

While in the case of an iron piece, the particles of matter are very very tightly packed and it requires great great force to break it up into pieces.