We can get the smell of perfume sitting several metres away

Chapter 1 : Matter in Our Surroundings Questions and Answers Science Class 9 Page-3 Q1.Which of the following are matter : Chair, air, love, smell, hate, almonds, thought, cold, cold drink, the smell of perfume. Solution: Anything that occupies space and has mass is called matter. Matter can exist in three physical states – solid, liquid, and gaseous. Chair and almonds are forms of matter in a solid state. A cold drink is a liquid state of matter. Air and the smell of perfume are gaseous states of matter. Q2. Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. Solution: Solids diffuse at a very slow rate. But, if the temperature of the solid is increased, then the rate of diffusion of the solid particles into the air increases. This is due to an increase in the kinetic energy of solid particles. Hence, the smell of hot sizzling food reaches us even at a distance, but to get the smell from cold food we have to go close. Q3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? Solution: The ability of a diver to cut through water in a swimming pool shows that matter is made up of particles. Q4. What are the characteristics of particles of matter? Solution: The characteristics of particles of matter are: • Particles of matter have spaces between them. • Particles of matter are continuously moving. • Particle...

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CBSE Study Material • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings NCERT Solutions Class 9 Science Chapter 1 – Free PDF Download NCERT Solutions for Class 9 Science (Chemistry) Chapter 1 Matter in Our Surroundings is an important study material from the standpoint of your CBSE Class 9 Science examination. Detailed Matter is an important concept in Science, and it forms the basis for topics that are taught in later classes. Learn more by referring to NCERT Solutions for Class 9 Science (Chemistry) Chapter 1 – Matter in Our Surroundings. Solutions are prepared with the help of dedicated teachers with a thorough conceptual understanding and years of experience. The content is well-structured so that it becomes easier for students to learn and understand. Also, content in the We also ensure that the NCERT Solutions provided are designed to meet multiple criteria that an evaluator typically looks for. This ensures that the answers are highly relevant and useful for hi...

Hint: Diffusion is the net movement of anything from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in concentration. Sublimation is the transition of a substance directly from the solid to the gas state. Complete step by step solution: Naphthalene balls disappear with time without leaving any solid. Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid. We can get the smell of perfumes sitting several meters away. Perfume has a higher degree of vaporization and its vapour diffuses into the air easily. Gaseous particles possess high speed and move very rapidly in all directions. When perfume is sprayed, its particles diffuse into the particles of air at a very fast rate and reach our nostrils. This enables us to smell the perfume from a distance. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration. Note: Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation. Through sublimation, a substance change...

1. MATTER IN OUR SURROUNDINGS As we look at our surroundings, we see a large variety of things with different shapes, sizes and textures. Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a particle of sand– each thing is matter. We can also see as we look around that all the things mentioned above occupy space, that is, volume* and have mass. Since early times, human beings have been trying to understand their surroundings. Early Indian philosophers classified matter in the form of five basic elements – the “ Panch Tatva”– air, earth, fire, sky and water. According to them everything, living or nonliving, was made up of these five basic elements. Ancient Greek philosophers had arrived at a similar classification of matter. Modern day scientists have evolved two types of classification of matter based on their physical properties and chemical nature. In this chapter we shall learn about matter based on its physical properties. Chemical aspects of matter will be taken up in subsequent chapters. 1.1 Physical Nature of Matter 1.1.1 MATTER IS MADE UP OF PARTICLES For a long time, two schools of thought prevailed regarding the nature of matter. One school believed matter to be continuous like a block of wood, whereas, the other thought that matter was made up of particles like sand. Let us perform an activity to decide about the na...

Matter in our surroundings is the 1st chapter from NCERT Chemistry textbook of class 9. Here in this chapter, we will first start by discussing the introduction of the chapter, followed by the chapter end questions and answers. Introduction From the perspective of your CBSE Class 9 Science examination, NCERT Solutions for Class 9 Science (Chemistry), Chapter 1 Matter in Our Surroundings, is an essential study resource. You will be better able to comprehend the key ideas in the chapter by studying the thorough NCERT Solutions for Class 9 Chemistry to each exercise question provided here. Chapter 9, Matter in our surroundings is a crucial topic in the science textbook for class 9 and serves as the foundation for many later-level concepts. With the help of determined experts with in-depth conceptual knowledge and years of experience, solutions are created. The NCERT Solutions' content has also been updated to reflect the most recent NCERT syllabus and make it easily understandable as well as available for students via Champstreet. Q 1. Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. SOLUTION: Chair, air, smell, almonds, cold drink and smell of perfume Q 2. Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get smell from cold food, you have to go close. SOLUTION: This happens because rate of diffusion of gas increases with increase in tempera...