Q17 of 19 Page 13

Make a model to explain the structure of particles in solids, liquids and gases.

1. Take some beads for solids


2. Arrange those balls without spaces because solid particles are tightly arranged without any spaces. E.g. woods, box, bench etc


3. For liquids leave some space because Liquid particles have some space between them. E.g. Petrol, water etc.


4. for gases leave very much gap because gas particles have the weakest force of attraction so they have very large spaces between them. e.g. oxygen air etc.



Fig.10


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13

Steam produces more severe burns than boiling water. Think why?

 14

Fill in the blanks.

a) Temperature does not change while a solid substance is …….. or a liquid substance is…….


b) A vapour on cooling changes into …….and on further cooling changes into……..


c) Matter changes from one state to another either raising the ………… or lowering the …………


d) A change in which a solid on heating directly changes into vapour state is called …………


e) The inter particle spaces are ………… in gaseous and ………… in solids.

 15

Match the following.

 16

How do you appreciate sweating mechanism of human body to control the temperature of the body?