Q. Why evaporation is called surface phenomenon? Ans : As evaporation occur on the surface of liquid. Q. List two processes from which it may be concluded that the particles of a gas move continuously. Ans: Compressibility and Brownian movement Q. At what temperature does solid ice and liquid water co-exist together? Ans: At 00C, the three phases of water co exist called triple point. Q. What is common among the three states of matter? Ans: They all contain molecules. Q. . Which property of gas is used in supplying oxygen cylinders to hospitals? Ans: Compressibility Q. a substance x was highly compressible and could easily be liquefied. it could also take the shape of the container. Predict the nature of the substance Ans: Gas Q. What is the state of water at 100 degree celsius, zero degree celsius and 4 degree celsius? Ans: The state of water in 100 degree celcius is gas, in 0 degree celcius it is solid and in 4 degree celcius it is liquid Q. can a liquid turn into vapor without heating? Ans: yes, By the process of evaporation as vaporization of water occur below the boiling point under atmospheric pressure. Q. What do you mean by Latent heat of Fusion? Ans: the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0 ° C into water, at 0 ° C will be known as the Latent Heat of Fusion of ice. Q. What is compressibility? How it is negligible in solids? Ans: Compressibility is the ability of a substance to be reduced to its volume under pressure. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids. Q. Two cubes of ice are pressed hard between two palms. After releasing the pressure, the cubes join together. Why? Ans: Pressure is directly proportional to temperature when we apply pressure, temp. Increases then the ice in contact melts and it turns into water. when pressure is removed, the temperature decreases again and melted ice again freezes .Hence cubes join together. Q. Explain why ice has lower density than water? Ans: The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases. When water changes into ice, space between particles increases. These spaces are larger as compared to the spaces present between the particles of water. Thus, the volume of ice is become greater than that of water. Hence, the density of ice became lower than that of water. As, a substance with lower density than water can float on water. Therefore, ice floats on water. Chapter : Matter In Our Surroundings
Module : 01 Contents: 1. Definition of matter 2. Physical nature of matter (i) Matter is made up of particles (ii) The particles of matter are very small 3. Characteristics of particles of matter (i) Particles of matter have spaces between them (ii) Particles are continuously moving. (iii) Particles attract each other Learning Objectives After studying the contents the students will be able to understand 1. What is matter? 2. What are the characteristics of the particles of matter? 3. What is diffusion? Key Terms: 1. Diffusion 2. Matter Activity Students are shown diffusion of potassium permanganate and copper sulphate crystals in water. Module : 02 Chapter : Matter In Our Surroundings Contents : 1. Three states of matter and their examples. 2. Properties of solids, liquids and gases. 3. Differences between solids, liquids and gases. Module :03 Chapter : Matter In Our Surroundings 2. Interchangeability between the three states of matter. 3. Effect of change of temperature and pressure. (i) Boiling and melting point of a substance of matter. (ii) Latent heat of fusion. (iii) Sublimation Learning Objectives After the Completion of the content the students will be able to understand. 1. How are the molecules arranged in different states of matter? 2. How can the different states of matter be interchanged? 3. What are the differences between the three states of matter? Key Terms: 1. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. 2. Latent heat of vaporization is the heat energy required to change 1 kg of liquid to gas at atmospheric pressure at its boiling point. 3. What is the effect of change of pressure on the various states of matter? 4. How does the temperature bring about the inter changeability between the three states of matter? Activity: Students are shown the sublimation of ammonium chloride. Practical No. 1 To determine the melting point of ice and the boiling point of water. Module : 04 & 05 Chapter : Matter In Our Surroundings Contents : 1. Conversion of Celsius scale to Kelvin scale and Vice versa. 2. Evaporation (i) Its definition and cause. (ii) Factors affecting evaporation. (iii) How does evaporation cause cooling? (iv) Difference between evaporation and boiling. Learning Objectives After the Completion of the content the students will be able to 1. Define evaporation 2. What are the various factors affecting evaporation. Key Terms: Students are given numericals on the conversions of temperature in Kelvin scale to celsius scale and vice versa. Matter in Our Surroundings extra scoring study material free IX Matter in Our Surroundings Notes IX Matter in Our Surroundings MCQ IX Matter in Our Surroundings [Solved] Visit to Download Files
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