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Nevertheless

This document provides sample solutions to chapter 1 questions from NCERT Class IX Science about matter in our surroundings. It defines what constitutes matter and explains that hot food smells carry farther than cold food due to the higher kinetic energy of particles at higher temperatures. It also discusses the properties of the three states of matter, including their rigidity, compressibility, fluidity, ability to fill containers, and density. The document arranges examples based on their increasing density and compares characteristics of the solid, liquid, and gas states of matter.

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167 views12 pages

Nevertheless

This document provides sample solutions to chapter 1 questions from NCERT Class IX Science about matter in our surroundings. It defines what constitutes matter and explains that hot food smells carry farther than cold food due to the higher kinetic energy of particles at higher temperatures. It also discusses the properties of the three states of matter, including their rigidity, compressibility, fluidity, ability to fill containers, and density. The document arranges examples based on their increasing density and compares characteristics of the solid, liquid, and gas states of matter.

Uploaded by

ravi chandran
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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NCERT SOLUTIONS

CLASS IX SCIENCE
CHAPTER 1- MATTER IN OUR SURROUNDINGS
1) Which of the following is matter? Chair, air, love, smell, hate, almond, thought, cold, cold drink, smell of perfume.

Soln:

Chair, Air, Almond, Cold drink.

2) Give a reason for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have
to go close.

Soln:

Generally, particles in the higher temperature possess high kinetic energy thus moves faster over a longer distance. Therefore the smell of the hot food reaches the
person several meters away.

3) A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Sain:

The property of water (liquid) that states the intermolecular space between the particles and the weak force of attraction is depicted in the action of diving through
waters.

4) What are the characteristics of the particles of matter?

Sain:

The characteristics of particles of matter are:

(a) They have intermolecular space between them

(b) They are continuously moving

(c) They attract each other

5) The mass per unit volume of the substance is called density. (density=masslvolume). Arrange the following in the order of increasing density: air, exhaust
from chimney, honey, water, chalk, cotton and iron.

Soln:

Increasing density: air<exhaust from chimney<cotton<water<honey<chalk<iron

6) Answer the following,

1. Tabulate the differences in the characteristics of matter.


2. Comment upon the following: Rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

Soln:

(1 )Difference in the characteristics of three states of matter.

Characteristics Solid Liquid Gas


Shape Fixed shape No Fixed shape No Fixed shape
Volume Fixed volume Fixed volume No Fixed volume
Rigidity/Fluidity Rigid/cannot flow Can flow/not rigid Can flow/not rigid
Intermolecular force Maximum Less than solids Very less
Intermolecular space Very less More than solids maximum
Compressibility negligible compressible Highly compressible

(2) (i) Rigidity: The tendency of a substance to maintain its shape when subjected to external force.

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