Ncert Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

If you’re a Class 9 student searching for the best study material to strengthen your understanding of science, NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is your go-to resource. This chapter is the first step into the world of chemistry, where you explore the nature, behaviour, and states of matter all around us.

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

IN-TEXT QUESTIONS SOLVED

NCERT Textbook for Class 9 Science – Page 3

Question 1. Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.
Answer: Chair, air, almonds, and cold-drink.
The smell of perfume (Smell is considered as a matter due to the presence of some volatile substances in air that occupy space & have mass.)

Question 2. Give reasons 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.

Answer: The smell of hot sizzling food reaches severed meters away, as the particles of hot food have more kinetic energy and hence the rate of diffusion is more than the particles of cold food.

Question 3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Answer: A diver is able to cut through water in a swimming pool. This shows that the particles of water have intermolecular space and has less force of attraction.

Question 4. What are the characteristics of the particles of matter?
Answer. The characteristics of the particles of matter are:
(1) Particles have intermolecular space.
(2) Particles have intermolecular force.
(3) Particles of matter are moving continuously.

Class 9 Science NCERT Textbook – Page 6
Question 1. The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of increasing density: air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Answer: Increasing density:
air < exhaust from chimneys < cotton < water < honey < chalk < iron.

Question 2. (a) Tabulate the differences in the characteristics of states of matter.
(b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

Solution:

(a) The difference in the characteristics of the three states of matter.

(b) Comment on:
(i) Rigidity: The tendency of a substance to retain/maintain their shape when subjected to outside force.
(ii) Compressibility: The matter has intermolecular space. The external force applied on the matter can bring these particles closer. This property is called compressibility. Gases and liquids are compressible.
(iii) Fluidity: The tendency of particles to flow is called fluidity. Liquids and gases flow.
(iv) Filling of a gas container: Gases have particles which vibrate randomly in all the directions. The gas can fill the container.
(v) Shape: Solids have maximum intermolecular force and definite shape.
Whereas liquids and gases takes the shape of container.
(vi) Kinetic energy: The energy possessed by particles due to their motion is called kinetic energy. Molecules of gases vibrate randomly as they have maximum kinetic energy.
(vii) Density: It is defined as mass per unit volume, the solids have highest density.

Question 3. Give reasons
(a) A gas fills completely the vessel in which it is kept.
(b) A gas exerts pressure on the walls of the container.
(c) A wooden table should be called a solid.
(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
Answer: (a) The molecules of gas have high kinetic energy due to which they keep moving in all directions and hence fill the vessel completely in which they are kept.
(b) A gas exerts pressure on the walls of the container because the molecules of the gas are in constant random motion due to high kinetic energy. These molecules constantly vibrate, move and hit the walls of the container thereby exerting pressure on it.
(c) The molecules/particles of wooden table are tightly packed with each
other, there is no intermolecular space, it cannot be compressed, it cannot flow, all these characteristics are of solid. So wooden table should be called a solid. ‘
(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it. But in case of solids, the molecules have maximum force of attraction, the particles are tightly bound due to this force. Hence large amount of external force is required to pass through solid.

Understanding the nature of matter is crucial for every science student, and Class 9 Science Chapter 1 — Matter in Our Surroundings — lays the foundation for advanced learning. To truly grasp the concepts and score high marks, using detailed and accurate NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is essential.

At Schoollearners.com, we provide the best NCERT solutions, helping students simplify tough topics, clear doubts, and boost their academic performance.

Overview of Class 9 Science Chapter 1: Matter in Our Surroundings

Chapter 1 introduces students to the basic concepts of matter, its properties, and the behaviour of different states of matter under varying conditions of temperature and pressure. The key topics covered include:

• Definition of matter
• Characteristics of particles of matter
• States of matter: solid, liquid, and gas
• Change of state
• Evaporation and its factors

To fully master these concepts, practicing with well-structured NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is highly recommended.

Importance of NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

The NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings are designed to help students:

• Understand the fundamental properties of matter easily.
• Solve textbook questions with step-by-step explanations.
• Prepare effectively for school tests and annual exams.
• Build a strong base for higher classes and competitive exams.

By referring to these solutions, students can improve their conceptual clarity and avoid common mistakes during exams.

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• Clear and concise explanations for every question.
• Neatly organized answers following the latest CBSE guidelines.
• Important diagrams and flowcharts to enhance understanding.
• Extra tips and notes for last-minute revision.

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Practicing with our expertly prepared solutions offers many advantages:

• Develops a deeper understanding of scientific concepts.
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• Helps in quick and effective revision before exams.
• Boosts confidence to tackle even tricky questions.

With regular practice using NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings, students can secure excellent marks and build a strong scientific temperament.

Conclusion

Matter in Our Surroundings is not just a chapter; it’s the first step into the fascinating world of Science. Strengthen your preparation by accessing the best NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings at Schoollearners.com.
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