Class IX
Chemistry
Questions Answers
Any thing which occupy space or having both mass and volume is said to be matter.
Q.No. 1 Which of the following are matter
Answer
Chair, Air, Almond cold drink and smell of perfume are matter because they occupy space and having both mass and volume.
Q.No. 2 Give reasons for the following observation:
We know that particles of matter are continuously moving. As temperature rises, particles move faster. Therefore, the smell of hot sizzling food reaches us several metres away.
But to get the the smell from cold food we have to go close because the temperature of cold food is less.
Q.No. 3 Answer
A diver is able to cut through water in swimming pool. This observation show the property of matter "Particles of matter have space between them".
Q.No. 4
There are following characteristics of particles of matter
1. Particles of matter have space between them.
2. Particles of matter are continuously moving.
3. Particles of matter attract each other.
Q.No. 5. The mass per unit volume of a substance is called density. density = mass /volume. Arrange the following in order of increasing density
Answer
Iron, Chalk, cotton, honey, water exhaust from chimney and air are written in decreasing order of density.
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