Here we have given Class 9 NCERT Science Textbook Solutions for Chapter 1 matter in our Surroundings. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. The fusion is the process in which (b) An iron almirah is a solid at room temperature because melting point of iron is higher than room temperature. Give the temperature at which water exists in two different phases/states. This solution contains questions, answers, images, step by step explanations of the complete Chapter 14 titled Natural Resources of Science taught in class 9. Answer. For a better understanding of this chapter, you should also see Chapter 1 Matter in Our Surroundings Class 9 notes , Science. Answer: Ammonium chloride, camphor and naphthalene balls. Define latent heat of fusion. Question 6. The particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. (c) What value of Akshay’s friend is seen in this act? Simple numerical calculations on these concepts have been explained in this solution. Answer: The rate of evaporation will increase with (b) A gas exerts pressure on the walls of the container. Every NCERT Solution is provided to make the study simple and interesting.Subjects like Science, Maths, English will become easy to study if you have access to NCERT Solution for Class 9 Science , Maths solutions and solutions of other subjects. (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. What is humidity? Why is ice at 273 K more effective in cooling than water at the same temperature? After you have studied lesson, you must be looking for answers of its questions. Download the NCERT Solutions app for quick access to NCERT Solutions Class 9 Science Chapter 1 Matter In Our Surroundings. Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume. Content is well-structured so that it becomes easier for students to learn and understand. This is due to an increase in the kinetic energy of solid particles. Did you find NCERT Solutions Class 9 Science chapter 1 Matter In Our Surroundings helpful? Matter can exist in three physical states—solid, liquid, and gaseous. Question 3. Question 4. The melting point of ice is 273.16 K. What does this mean? The cooling of tea in saucer takes place sooner than in a cup. Answer: The molecules of water present on the surface of the exposed area which are in very small fraction, gains the energy from the surrounding. For a better understanding of this chapter, you should also see summary of Chapter 1 Matter In Our Surroundings , Science, Class 9. (a) it holds latent heat 11. Formulae Handbook for Class 9 Maths and Science. Why? Give two examples of diffusion. (a) freezing (b) condensation Question 2. She told the driver to be more careful during summers. (c) Shreya showed the value of concerned citizen and morally responsible behaviour. The characteristics of the particles of matter are: Question 17. Ice at 0°C is more effective in cooling than water at the same temperature because to help you to revise complete syllabus and score more marks in your examinations. NCERT Solutions for Class 9 Science are given for the students so that they can get to know the in text question and chapter end question answers in case they are not able to find it.It is important for all the students who are in Class 9th currently. (ii) Compressibility: The matter has intermolecular space. Question 10. You can also check out NCERT Solutions of other classes here. (c) 10.1325 x 105 Pa (d) 10.1325 x 106 Pa Question 4. Question 9. Answer: Solid. Air and smell of perfume are gaseous states of matter. (1) Surface area: If the surface area is increased the rate of evaporation also increases. Answer: A diver is able to cut through water in a swimming pool. Question 3. Answer: Ice is a solid but its density is lower than water due to its structure. As the pressure of air decreases, the boiling point of the liquid Sita lived in a village and could, not afford refrigerator in her house. Question 2. Answer. (d) all temperatures (c) 100°C is liquid and gas. Also please like, and share it with your friends! (c) both (a) and (b) The conversion of gas into liquid is called (a) water boils at 100°C (b) water boils at <100°C 12. Give reason for the following observations. Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton and iron. Choose the correct option: (a) A gas fills completely the vessel in which it is kept. (b) an iron almirah is a solid at room temperature. At 100°C water can be in liquid or in gaseous state. (a) its density is more than water (b) its density is less than water NCERT Textbook Questions – Page 10 (b) Why should one be more careful with CNG cylinders during summer? Chapter 13: Why do we Fall ill. Diseases, its types, and causes have been discussed here in detail. If you liked the video, please subscribe to our YouTube channel so that you can get more such interesting and useful study resources. On hot and humid day, desert coolers are not effective as the air cannot hold any more moisture to get the cooling effect. But you must have observed that ice floats on water. But, if the temperature of the solid is increased, then the rate of diffusion of the solid particles into air increases. (1) an increase of surface area, Click Here Take the steam that is coming out of a boiling water and allow it to cool down, it condenses to form water and on further cooling of this water we get ice. Hence the cooling effect of ice is more than the water at same temperature because water does not absorb this extra heat from the medium. Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume. (a) Tabulate the differences in the characteristics of states of matter. (a) Why did the type burst? The particles have their state and starts vibrating freely and a stage reaches when the solid ice melts and is converted to liquid state at the same temperature i.e., 273 K. Question 19. (d) gases cannot diffuse in solids 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. Answer: Cotton has large number of pores, in which air is trapped. Answer: Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. Answer: Ice is solid at 0°C i.e., 273° K. The molecules of ice are tightly packed.

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