Changes from the solid to the liquid or from the liquid to the gaseous state and vice versa are called phase changes. %PDF-1.6 %���� Answer: Average Kinetic Energy of molecules increases. Then it is heated by suspending it inside a heater. Question 44: Bottled drinks are cooled more effectively, when surrounded by lumps of ice than iced water. Gradually, more and more molecules gain sufficient energy to overcome the intermolecular forces binding the molecules one to the other. The latent term is used whenever there is a phase change process. It follows that if s is more, Δθ will be small (for given values of H and m). Form its outer surface, water get evaporated taking latent heat needed for evaporation from inside water as well as surrounding air and so the temperature of inside water falls. Assuming specific heat capacity of water = 4.2 J/g °C and specific latent heat of vaporisation = 2260 J/g, calculate: (i) the time taken for the temperature of water to rise from 25°C to its boiling point, (ii) the mass of water which evaporates per minute from the boiling water. Answer: The reason is that sweat from our body evaporates faster under a moving fan due to rapid movement of air and so a cooling sensation is caused which makes us more comfortable. If the final temperature is 50°C. d. it behaved as the nucleophile? Your email address will not be published. Answer: One calorie is the heat required to raise the temperature of 1 g of water from 14.5°C to 15.5°C 1 Calorie = 4.2 joule. April 18, 2020, 2:10 am, by latent heat of the metal? For example, one calorie is required to increase water to one degree by room temperature, but only 0.5 calorie is required to increase the temperature of ice by one degree to -5 degrees. 40 cal C. 270,000 cal D. 1.08 cal … ���'�,���lx(�� The calorie is now defined in terms of the SI unit of energy, the joule, by: 1 cal = 4.184 J 2.1 Latent Heat Under certain circumstances the heat supplied to (or removed from) the material does not cause a change in the temperature of a substance; instead … Tin : latent heat of fusion: 14 calories / 113 KJ. Question 13: The specific latent heat of fusion of ice is 336 J/g. Solution: Question 6: 40g of ice at 0°C is used to bring down the temperature of a certain mass of water at 60°C to 10°C. Question 19: Explain, why water is considered as best liquid for quenching thirst? GAVIN THOMAS It is also defined as the total kinetic energy possessed by all the molecules of a body. Upon reaching 100°C (212°F) the temperature stops increasing, even though the flame keeps supplying heat at the same rate as before. The final temperature is carefully noted. Question 67: Explain, why no tracks are left on the ice during ice skating? Answer: Heat capacity of substance B is more than substance A. The amount of heat added to this substance and the temperature of the substance are plotted on the following graph:  If the specific heat capacity of the solid substance is 500 J/kg °G, find from the graph, (i) the mass of the substance. Thus, when hails melt, they absorb large amount of heat energy from surroundings. Nickel : latent heat of fusion: 58 calories. What is the sp. Question 51: 1 kg of steam condenses to water at 100°C. Water is used as an effective coolant because of its large specific heat capacity due to which it can extract more heat. The solid chosen should be insoluble and non reactive with the liquid. When it is allowed to solidify at the same temperature, it gives out 75000 J of heat. endstream endobj 103 0 obj <>stream celcius to 25.7 deg. Every gram of steam supplies a great amount of heat energy of about 2260 joule. = mL = 5 × 2268 KJ = 11440 kj. Answer: (i) Water is used as an effective coolant in radiator of a car. Answer: Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and water vapours. Question 4: Discuss how high specific heat capacity of water helps in formation of land and sea breeze. How many calories of heat energy are required to melt 20 grams of ice at 0 °C? What can you say about the heat capacity of A as compared to that of B? latent heat of fusion of 336,000 jkg-1. of 1 g of a substance 1°C. The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram. But as soon as the skater moves further, the water does not experience any pressure and re-freezes into ice leaving no track on ice surface. Its S. I. unit is J/kg. Question 32: Give one example where high specific heat capacity of water is used as a heat reservoir. 101 0 obj <>stream (Given: Specific heat of ice = 2.1 J/g, latent heat of ice = 340 J/gm, latent heat of steam = 2240 J/gm, specific heat of steam = 2.1 J/gm and specific heat of water = 4.2 J/gm.) remains the same. Heat lost by hot body = Heat gained by cold body. Water (in liquid state): 1 Calorie per gram to increase 1 ° C units? Solution: Question 2: 63.2 g of copper at 50°C can just melt 3.8g of ice. Question 46: 1 kg of water freezes to form ice at 0°C. Question 2: Define the term calorie. Question 56: When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it? Explain. Answer: The frost can seriously damage the leaves and fruit of plants. Calculate the specific heat capacity of the solid. Gold: 0.0308 calorie per gram c. it behaved as a catalyst. Required fields are marked *. Potassium: 0.019 calorie per gram K; the heat of fusion of water is. Answer: The phenomenon of the trapping of infrared radiations of long wave length being radiated to space by greenhouse gases like carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) to keep the environment warm at the planet’s surface and the lower atmosphere is called greenhouse effect. [Specific heat capacity of water = 4.2 J g-1 ° C-1 Specific latent heat of fusion of ice = 336 J g-1] Solution: Question 6: A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. If ice at 0°C is changed into liquid water at 0°C, the heat added (the latent heat of melting) is 80 calories for every gram of ice. How much heat (calories) must be applied to a 100 mL beaker filled with boiling water in order to vaporize the water? Thus, no frost is formed. Answer: The main precautions are: (i) Every possible care should be taken to see that steam is perfectly dry before passing into water. Question 11: Does the specific heat capacity of a substance depend upon its mass and rise in temperature only? The heat of freezing is the amount of thermal energy given off as a liquid freezes, and the heat of vaporization is the amount of thermal energy that must be added to change a liquid to a gas. For more information please refer to the documentation. The steam generated in the boiler is passed through pipes in radiators fixed within the building. Answer: Latent heat is absorbed by the melting ice. : latent heat of fusion: 6 calories; Latent heat of vaporization: 870 KJ. (ii) Kilo calorie: It is the quantity of heat required to raise the temperature of 1 kg of water by 1°C. The plot shows the temperature of the element chosen as a function of the calories supplied. GAVIN THOMAS Answer: 22,60,000 J. Answer: (i) The specific latent heat of fusion of ice is 3,36,000 J/Kg. It is thus like mass in mechanics which determines the change in velocity (or the acceleration) produced by a given force. Answer: Hot water bottles are used for fomentation since since water does not cool quickly due to its large specific heat capacity. Question 48: What energy change would you Expect to take place in the molecules of a substance when it undergoes: (i) a change in its temperature? Calculate the specific heat capacity of the metal. You may also want to check out these topics given below! Question 2: What observation you will record and how will you determine the specific latent heat of fusion of ice? provides ICSE Solutions for Class 10 Physics Chapter 10 Specific Heat Capacity and Latent Heat for ICSE Board Examinations. Question 1: A piece of ice is heated at a constant rate. -^�"���2?��Ѫ_l&e�A����mǤ�6�q����������fM��}��}~�UP�?JǸ���h5 Because it contains latent heat 80 cal. Solution: Question 5: How much heat energy is released when 5 g of water at 20° C changes to ice at 0° C? Sulfur : latent heat of fusion: 38 KJ; Latent heat of vaporization: 326 KJ. Question 34: Name the liquid which has the highest specific heat capacity. The contents of the calorimeter are well stirred and its final highest temperature is recorded to be 28 °C. Apply heat to nickel below 1450 ° C. Water : latent heat of fusion: 80 calories per gram (it takes 80 calories for one gram of ice at 0 ° C to turn into water), latent heat of vaporization: 540 calories per gram (it takes 540 calories for one gram of water at 100 ° C turns into steam).

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