Answer: Due to the rise in sea level the buildings and roads in the coastal areas will get flooded as a result population living in that area will suffer damage from hurricanes and tropical storms. The latent heat of vaporization for water is 539.6 cal/gram. (ii) From the graph, we conclude that ice takes less time in heating from -10°C to 0°C. Question 1: Explain briefly, how you would determine the specific heat capacity of a liquid? Thus when water evaporates it absorbs large amount of latent heat and thus cooling is caused. Answer: It means that at 100°C, 2260 × 103 J of heat energy is absorbed by 1 kg of water to convert it into steam at 100°C, or 1 kg of steam at 100°C liberates 2260 × 103 J of heat energy in converting into 1 kg of water at 100°C. endstream endobj 102 0 obj <>stream How much heat is needed to warm it by 15°C? If the specific heat capacity of water is 4.2 J/g°C and of copper is 0.4 J/g°C, find: (i) the heat gained by water, (ii) the heat gained by calorimeter, (iii) total heat supplied by the metal piece, and (iv) the specific heat capacity of metal. Heat given = Heat Taken. The observations recorded are: If L j/gm be the specific latent heat of fusion of ice and sc be the specific heat capacity of copper, then: Question 1: The temperature of a lead piece of mass 400 g rises from 20°C to 50°C when 1560 J of heat is supplied to it. Answer: The rising temperature will lower water quality in lakes and oceans through a fall in oxygen concentrations, release of phosphorus from sediments and increased thermal stability due to which many marine species will either die or they will become extinct. Question 47: Why does the heat supplied to a substance during its change of state not cause any rise in its temperature? Since the size of the Fahrenheit degee is not the same as that of the celsium degree, a change of scale will affect the specific heat capacity. How is it related with joule (the SI unit of heat)? Thus, specific heat capacity depends upon the nature of the substance also and so its is different for different substances. The latent heat of evaporation of the ‘sweat’ is withdrawn from the body itself and therefore, cools the body. Answer: 1g steam at 100°C contains more heat than 1g water at 100°C. calculate the energy, in joules and calories required to heat 25.0g of water form 12.5 deg. ����7Q��"8Nܱ��q����� �S�TˆӾ�Ks���f���JY7�0����k� �/e Hmm..I am explaining in a very easy way. Question 34: Name the liquid which has the highest specific heat capacity. 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. Question: How Many Calories Are Required To Change One Gram Of 0°C Ice To 100°C Steam? The reason is that lg steam at 100°C, when converts to 1 g water at 100°C, liberates 2260 J heat. Download Formulae Handbook For ICSE Class 9 and 10. ​. Question 9: Name the substance which has maximum specific heat capacity. August 2, 2020, 2:11 am, by If steam at 100°C is changed into the water at 100° C, 540 calories for every gram of steam must be subtracted. April 18, 2020, 1:55 am, by Aluminum: 0.215 calories per gram Question 66: Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating? Question 8: m kg of a substance of specific heat capacity s J/kg °C is heated so that its temperature rises from θ1°C to θ2°C. (ii) In thermal power station, steam is used as a medium for converting the chemical energy of coal to electric energy. Answer: This depends upon the fact that water in the process of evaporation takes away heat equivalent to latent heat from the patient’s body and thus lowers the temperature of his body. Question 60: Why water get cooled in a ‘Surahi’ in hot season? Alumino : latent heat of fusion: 85 calories / 322-394 KJ; Latent heat of vaporization: 2300 KJ. Answer: Copper is preferred over other metals for making calorimeters because: (i) It has a low specific heat capacity. (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. CD part of the graph represents time in seconds taken by water at 100°C to convert into steam at 100°C. One fourth of a pepperoni pizza plus a whole ham-and-pineapple pizza contains 745 Calories. Answer: The three ways to minimize global warming are: (i) Reduction in the use of fossil fuels and adoption of technology based on renewable sources of energy. It is also defined as the total kinetic energy possessed by all the molecules of a body. If the specific heat of water is 1.0 calorie/gram°C, how many calories are required to raise 500 grams of water 10.0°C? If the change is from liquid to gas, it is called heat of vaporization. It is thus heat per unit mass and does not depends upon the scale of temperature used. Calculate the specific latent heat of vaporsation of steam (Given: specific heat capacity of water = 4200 J/kg°C, specific latent heat of fusion of ice = 336,000 J/kg.) The solid chosen should be insoluble and non reactive with the liquid. 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. (ii) Burning of forests and deforestations. It is the sensation of hotness and coldness. 40 cal C. 270,000 cal D. 1.08 cal Question 1: A piece of ice is heated at a constant rate. (ii) The specific latent heat of vaporisation of steam is 22,60,000 J/kg. Question 5: How is the heat capacity of a body related to the specific heat capacity of its substance? Find the time required to convert 50g of ice at -20°C into superheated steam at 140°C. 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. Question 22: Explain, why are big tubs of water kept in underground cellars for storing fresh fruit and vegetables in cold countries. Apply heat to zinq below 420 ° C We know that the supplied goes into breaking the bonds between the molecules, while the kinetic energy of the molecules remains unchanged. Answer: Water has the highest specific heat capacity.


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