VIVEK KUMAR GAURAB ROLL.NO.-42

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CHAPTER 1 

MATTER IN OUR SUROUNDING

Activity 

Q. Why do we observe that level of water does not change after dissolving salt in it?

A. We observe that level of of water does not change after dissolving salt in it because

      when we dissolve salt then the salt get space between the molecules of water.                                    so,the level of water does not change after dissolving salt in it.

                                                                         HOMEWORK

                                                           PROPERTIES OF PARTICLES

1. 1. Particles of matter are very small in size.
2. 2. particle of matter  have space between them   .
3. 3. particle of matter   are continuously moving.   
4. 4. particle  of   matter    have    attraction      between       them   .            

Why solid are hard??

solid are hard because their molecules are closely packed  

and they have more force of attraction .

GIVE REASONS

Q.1 WHY  table is hard?
ANS-Table is hard because their molecules are closely packed and 
they have more force of attraction between them.
Q.2 Diver is able to cut water ?
ANS-water is fluid, i.e change its shape when applied force. The diver is able to
cut the water by applying force and changing its shape. 
Q.3 Smell of hot sizzling food reaches to our nose?
ANS .smell of hot sizzling food reaches to our nose because the have more 
kinetic energy 
and have large space between them to dissolve.
Homework
Latent heat of fusion