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# NCERT Solutions Class 9 Science - Chapter 1 Matter in our surroundings - PDF Download

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NCERT Solutions for class 9 science chapter 1 Matter in our surroundings is an essential study material from the point of view of your class 9 science examination. The detailed NCERT solutions for class 9 science chapter 1 will help you to understand the basic concepts taught in this chapter.

The concept of matter is an essential concept in science. It forms the foundation for topics taught in subsequent classes. For more information, please refer to NCERT solutions for Class 9 science chapter 1 – Matter in our surroundings by eSaral. The NCERT solutions are prepared by dedicated teachers of eSaral with a deep conceptual understanding and many years of experience. They have well-structured content to make it easier for students to understand and learn.

## NCERT Solutions for Class 9 Science Chapter 1 Topics

Section Name

Topic Name

1

Matter in Our Surroundings

1.1

Physical Nature of Matter

1.2

Characteristics of Particles of Matter

1.3

States of Matter

1.4

Can Matter Change its State?

1.5

Evaporation

1.1 Physical Nature of Matter: The physical nature of matter includes the fundamental characteristics of matter and its behavior under various conditions.

Subtopics covered in the section 1.1 Physical Nature of Matter:

1.1.1 matter is made up of particles

1.1.2 how small are these particles of matter?

1.2 Characteristics of Particles of Matter: The characteristics of matter particles play a fundamental role in determining the properties and behavior of various substances.

Subtopics covered in the section 1.2 Characteristics of Particles of Matter:

1.2.1 Particles of matter have space between them

1.2.2 Particles of matter are continuously moving

1.2.3 particles of matter attract each other

1.3 States of Matter: The three states are solid, liquid, and gas. In a solid, the particles are tightly packed in a uniform pattern and vibrate in place. They do not move freely around each other. In a liquid, the particles are still tightly packed, but they move around each other freely. The liquid takes on the shape of its container. In a gas, the particles are dispersed and move in all directions. Gas particles have the highest kinetic energy of the three states.

Subtopics covered in the section 1.3 States of Matter:

1.3.1 The solid state

1.3.2 The liquid state

1.3.3 The gaseous state

1.4 Can Matter Change its State?: The state of matter can be altered by temperature and pressure. There are three fundamental states of matter: solid, liquid and gas. Matter can transition between these states through different processes.

Subtopics covered in the section 1.4 Can Matter Change its State?:

1.4.1 effect of change of temperature

1.4.2 effect of change of pressure

1.5 Evaporation: Evaporation is the transformation of a liquid into a gas or vapour at its surface, including at temperatures below the boiling point of the liquid. The process of evaporation is a phase transition caused by the kinetic energy of the particles present in the liquid.

Subtopics covered in the section 1.5 Evaporation:

1.5.1 Factors Affecting Evaporation

1.5.2 How Does Evaporation Cause Cooling?

## Key Features of Class 9 Science Chapter 1

• Small particles make up matter.

• There are three types of matter: solid, liquid, and gas.

• Forces of attraction between particles are highest in solids, lowest in liquids, and highest in gases.

• The space between the component particles and kinetic energy of the particles is minimal in solids, intermediate, and highest in liquids and gases.

• In the case of solids, the arrangement of the particles is most orderly

• However, in liquids, the layers of particles may slip and slide over each other. In the case of gases, the arrangement is not orderly, with particles moving around randomly.

• The states of the matter are interconvertible, and can be altered by changes in temperature or pressure, with sublimation being the direct transfer of the solid state to the gas state without the need to go through liquid state, and deposition being the transfer of the gas state directly to the solid state without the need for liquid state.

• Boiling is also a bulk phenomenon, with particles from the bulk of the liquid changing into vapour.

• Evaporation is an example of a surface phenomenon, where particles from the surface of the liquid are able to overcome the attraction present in the liquid, resulting in the transformation into vapour.

## Benefits of Downloading the PDF of NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings

Downloading PDFs of NCERT solutions for class 9 science chapter 1 “Matter in our surroundings” can provide specific advantages based on the features of eSaral. Here are some of the advantages of downloading NCERT Solutions for class 9 science.

Expertly crafted solutions: eSaral offer solutions that are carefully curated by educators and subject experts to ensure high-quality and correct explanations.

Easy access: The PDF of the NCERT Solutions is readily available on your device for quick and easy access whenever you need it. This way, you can study them anytime, anywhere without having to be connected to the internet.

Comprehensive understanding: The solutions provide detailed explanations of each question and topic in the chapter, helping students to fully understand the topic and improve their understanding of it.

Step-by-step learning: The solution is presented in a structured way, allowing students to follow and learn step-by-step. This is especially useful for complex topics and concepts.

Visual clarity: The solution often includes diagrams, graphs and examples that help students to visualize the concepts in the chapter, making them easier to understand.

Exam preparation: NCERT solutions are designed to help students prepare for exams and exam patterns by aligning them with the curriculum.

Self-assessment: Once students have tried the questions in the chapter, they can use the solution to check their answers and evaluate their performance, helping them to identify areas that need more practice and focus.

#### Frequently Asked Questions

Question 1: What are the three states of matter?

Answer 1: There are three fundamental states of matter: solids, liquids, and gases. These states are defined by the arrangement and motion of particles.

Question 2: How are the particles arranged in solids, liquids, and gases?

Answer 2: In solids, the particles are tightly packed and have a fixed position. In liquids, the particles are loose and can move around one another. In gases, the particles are dispersed and move freely.