NCERT Solutions for Class 9 Science Chapter 1: Matter In Our Surroundings

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The NCERT Solutions for Class 9 Science have been provided in this article. Some of the important concepts in Chapter 1 Matter in Our Surroundings include:

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NCERT Solutions for Class 9 Science Chapter 1

NCERT Solutions for Class 9 Science Chapter 1 Matter In Our Surroundings

Matter can be defined as something that has mass and occupies space. Every matter is made up of molecules packed together. Matter can be classified into 3 states: solid, liquid and gas. The state of matter depends upon the closeness of molecules.

Properties of Matter

The properties of matter helps us differentiate between different materials and their formation. Properties of matter refers to the traits in materials that can be measured.

Some of the Properties of Matter are:

Matter is any substance that occupies a certain amount of space and has mass. It is made up of atoms.
Atoms are very small in size and is not visible with the naked eyes.
Particles of matter are found to be in motion constantly.
Particles of matter have gaps or spaces between them.

LPG Composition

Liquified Petroleum Gas (LPG) can be defined as a compressed gas extracted from wet natural gas via the method of absorption.

Example: What are three active components found in LPG?

Solution: The three active components found in LPG include:

Propane
Butane
Propylene

Condensation

Condensation can be defined as the process where water vapor gradually converts into a liquid form. Condensation is also said to be the reverse of evaporation, where liquid water gradually turns into vapor.

Example: Name and define the two primary types of condensation reaction.

Solution: The two types of condensation reactions include:

Intramolecular Condensation: Intramolecular condnsation occurs when two functional groups of the same molecule tend to react in order to eliminate a simple molecule in the reaction.
Intermolecular Condensation: Intermolecular condensation occurs during the reaction between two molecules (either having same or different compounds).

Evaporation

Evaporation is a type of vaporization that helps turn liquid water into vapor. One of the primary examples of evaporation is when a ice cube melts.

Example: What are some factors that affect Evaporation?

Solution: Some of the factors that affect Evaporation are:

Surface Area
Temperature
Wind
Humidity

Also Read:

Unit Related Topics
Factors Affecting Evaporation	Characteristics of Particles of Matter	Definition of Matter
States of Matter	Change of State	Pressure
Physical Nature of Matter	Matter in Our Surroundings Important Questions	Characteristics of Particles of Matter Attraction Space and Motion

Also Check:

Important Science Study Guides
Physics Constants	Named Reactions	Periodic Table
Difference between in chemistry	Difference between in physics	Difference between in biology

CBSE X Related Questions

1.
Which structure in a leaf is mainly responsible for gaseous exchange?
- Xylem
- Stomata
- Phloem
- Cuticle
View Solution
2.
On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?
- Copper and zinc
- Copper and iron
- Silver and magnesium
- Magnesium and aluminium
View Solution
3.
Assertion (A): Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule.
Reason (R): The higher energy of UV splits apart some molecular \( O_2 \).
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
View Solution
4.
The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:
- tomato, curd, ant-sting
- tomato, orange, nettle-sting
- orange, milk, ant-sting
- orange, sour milk, nettle-sting
View Solution
5.
Identify the correct statement for spirogyra, leishmania and hydra
- they reproduce sexually.
- they are unicellular.
- they are multicellular.
- they reproduce asexually.
View Solution
6.
Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
Gamete carrying X chromosome from female parent.
Gamete carrying X chromosome from male parent.
Gamete carrying Y chromosome from male parent.
- (ii) and (iii)
- (i) only
- (i) and (iii)
- (iii) only
View Solution