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. ��w=h��pRz�Ѿ=y��im���O�=r9ʖ�$|?����eK��iDy���D���}19��@8�о�Z�WZ@=��k�+��PHC���bi���[V���� o��L�ݵ���u�O���T#�A�W���Kr,liaOP� ��J��_x��I5�7�� 6�~X�ƜԆb��F� The specific heat capacity of the liquid is 2.65 Jg-1 °C-1 while that of water is 4.2 J g-1 °C-1. Question 49: Ice is more effective in cooling than the ice-water. Answer: Water has the highest specific heat capacity of 4.2 Jg-1 °C-1. Question 70: Explain the meaning of greenhouse effect. Question 52: What happens to the average kinetic energy of the molecules as ice melts at 0°C? Question 28: Specific heat capacity of substance A is 3.8 J g-1 K-1 whereas the specific heat capacity of substance B is 0.4 J g-1 K-1. Answer: The specific latent heat of vaporization of water is 2260 J/g = 538 calories/g. The heat energy is used in breaking the hydrogen bonds which hold the molecules of … Answer: The weight of the body acts on a very small area of skate, in comparison to that of ice. [Specific heat capacity of water = 4200 J kg-1 °C-1] [Specific latent heat of fusion of ice = 336 × 103 J kg-1] Solution: Let mass of water used = m gm. Answer: The heat required to convert 1 g of ice from 0°C to 1 g water at 0°C is 336J. Question 7: What are the factors on which the quantity of heat given to a body depends? Similarly, while ice melts, it remains at 0 °C (32 °F), and the liquid water that is formed with the latent heat of fusion is also at 0 °C. Answer: For fermentation purpose in hot water bottles. One fourth of a pepperoni pizza plus a whole ham-and-pineapple pizza contains 745 Calories. Which of the two is a good conductor of heat? CBD For Tolerance: Signs You May Have A Tolerance To CBD. The latent heat of vaporization of water is 2260 × 103 J/kg. Therefore, changing a given quantity of water to steam requires 5.4 times as much heat as warming it from 0°C (+32°F) to 100°C (212°F), and melting ice requires as much heat as warming water from 20°C (68°F) to 100°C. Question 46: 1 kg of water freezes to form ice at 0°C. Answer: This heat supplied is used in the change of state. The solid chosen should be insoluble and non reactive with the liquid. Download Formulae Handbook For ICSE Class 9 and 10. endstream endobj 104 0 obj <>stream Answer: Heat capacity of a body = Mass of the body × Specific heat capacity of its substance. 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. 1,040 cal B. They always involve a transfer of heat, even though the temperature of the substance undergoing the phase change stays constant. Which material has a higher specific heat capacity? Question 11: Does the specific heat capacity of a substance depend upon its mass and rise in temperature only? Question 47: Why does the heat supplied to a substance during its change of state not cause any rise in its temperature? heat capacity of water 4.2 g-1 °C-1, sp. Let the mass of hot body be m1, its specific heat s1 and its temperature t1 °C and let the mass of cold body be m2, its specific heat s2 and its temperature t2 °C. 9-19. Thus, atmospheric temperature drops. ���'�,���lx(�� Question 2: Define the term calorie. Question 72: How does green house effect help in keeping the temperature of earth’s surface suitable for living human beings? Steel : latent heat of fusion: 50 calories. latent heat of fusion of 336,000 Jkg-1. The water gives off 4200 J of heat energy for every one kg for 1°C fall is temperature. No featured entries match the criteria. The latent heat of vaporization of water is 540 calories/gram. : latent heat of fusion: 43 calories; Latent heat of vaporization: 2360 KJ. 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). Your email address will not be published. At first, the temperature rises. For more information please refer to the documentation. … It is also defined as the total kinetic energy possessed by all the molecules of a body. or cud it be B.? Answer: (i) It is responsible for the climate changes in different parts of the world and it has forced people to migrate from one place to the other. The heat of vaporization of water is the highest known value. Lorecentral.org is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com, Examples of Specific, sensible and latent heat. Apply heat to bronze that is below 880 ° C Question 3: Differentiate between heat and temperature. unit. (i) Heat capacity of lead piece, (ii) Specific heat capacity of lead. The historical unit of heat energy, the calorie, was defined as the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius. As a pot of water boils, the temperature of the water as the water level drops. Heat given = Heat Taken. (ii) a change in itsstate without any change in its temperature? Thus, for a given body, its specific heat capacity determines the change in temperature produced by a given quantity of heat. Validate the input as follows: - Make sure the number of fat grams. Question 38: What is ‘Calorimetry’? Thus, air above land becomes hot and light and rises up resulting in drop in pressure of land mass during day time. Thus, specific heat capacity depends upon the nature of the substance also and so its is different for different substances. The specific heat capacity of water is 4.2 J/kg°C = 1 cal/g°C which is quite high and this is the reason for using wafer in hot water bottles. Thus, when hails melt, they absorb large amount of heat energy from surroundings. Answer: 3,36,000 J. Give reason. Under this high pressure, ice melts to form water below 0°C. Magnesium : latent heat of fusion: 72 calories. Explain with reason. Answer: The frost can seriously damage the leaves and fruit of plants. Answer: Latent heat is absorbed by the melting ice. The calorimeter is placed inside the box and is continuously stirred till the whole of ice is melted. February 27, 2020, 11:59 am. Calculate the drop in temperature ignoring the heat capacity of the container. (Specific latent heat of vaporization of steam = 2268 J/g, specific latent heat of fusion of ice = 336 J/f and specific heat capacity of water = 4.2 J/g°C) Solution: Assume, final temperature of contents = θ°C. Answer: (i) The specific latent heat of fusion of ice is 3,36,000 J/Kg. We talked about the three phases – gas, liquid, and water. Expression for the heat energy liberated by hot body = mcΔQ i.e., H = mcΔQ where m is mass, c is specific heat capacity, ΔQ is the change in temperature. 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. Solution: Question 9: A vessel of negligible heat*capacity contains 40g of ice in it at 0°C, 8g of steam at 100°C is passed into the ice to melt it. Question 24: Differentiate between heat capacity and specific heat capacity. Improving your life knowledge health and family. This is because this quantity is simply the heat needed to change the state of 1 kg of a substance at its melting/boiling point without any change in temperature. (iii) Fostering international co-operation to reduce greenhouse gas emission. Steel : latent heat of fusion: 50 calories. Question 6: State the condition for the flow of heat energy from one body to another. (ii) Kilo calorie: It is the quantity of heat required to raise the temperature of 1 kg of water by 1°C.
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