CHAPTER 1 -MATTER IN OUR SURROUNDINGS
QUESTION 1-What is matter?
ANSWER1-We look at our surrounding, we see a large variety of things with different shapes, size and textures.Everything in the universe is made up of material which scientists have named matter'. The air we breathe,the food we eat, stones,clouds, stars, plants and animals, even a small drop of water or a particle of sand- every thing is called matter.
QUESTION 2- Why do we observe that the level of water doesn't change even after dissolving salt and sugar in it?
ANSWER 2- The particles of sugar, salt got evenly distributed in water.Similarly when we make tea, coffee or lemonade, particles of one type of matter get into the spaces between the particles of others. These shows that there is enough space between particles of matters.
QUESTION 3-Write property of particles?
ANSWER 3- 1.Particles of matters have space between them.
2.The particles of matter are very small, they are small beyond our imagination.
3.They are continously moving.
4.Paricles of matter are very small.
QUESTION 4- Why the solid have fixed shape?
ANSWER 4- Solid is a matter and every matter have a definite shape and volume. So the molecules in a solid are in a fixed place and are in close to each other.The molecules can vibrate but cannot move from one part of the solid to a another part.
QUESTION 5-Give Reasons:-
(i) Table is hard
(ii) Diver is able to cut the water
(iii)The smell of hot sizzling food reach to our nose
ANSWER 5:-
(i) Table is hard because the molecules are and they have no space to move.
(ii)Particles of water atract each other but attraction is not strong enough to prevent the diver
to cut through water.
(iii)The smell of hot sizzling food reaches us because particles of food diffuse faster in air when
hot whereas when food is cold it diffuse slower so it take more time than hot sizzling food.
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