latent heat of vaporization of water in calories

Question 55: What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance? Solution: Question 3: Water falls from a height of 50 m. Calculate the rise in the temperature of water when it strikes the bottom. APlusTopper.com provides ICSE Solutions for Class 10 Physics Chapter 10 Specific Heat Capacity and Latent Heat for ICSE Board Examinations. Calculate the latent heat of vaporization of water. 1000w heater is used in the determination of specific latent heat of vaporization of water and it took 4 minutes for 500g of water to be changed to steam. Answer: A clean and dry copper calorimeter with a strirrer, is weighed when empty, again weighed when filled nearly 2/3 with water. Because it contains latent heat 80 cal. After some time, 600 g of ice at 0°C is left and 450 g of water at 0°C is formed. 101 0 obj <>stream Alumino : latent heat of fusion: 85 calories / 322-394 KJ; Latent heat of vaporization: 2300 KJ. What is the correct name for the compound CaSO4. In talking about the heats involved in changing temperatures, one thing we’ve neglected is what happens when a material changes phase. Question 10: Calculate the amount of heat released when 5.0 g of water at 20°C is changed into ice at 0°C. If the specific latent heat of ice is 336 J/g, find the specific heat capacity of copper. Solution: Question 16: Steam at 100°C is passed over 1000 g of ice at 0°C. April 18, 2020, 2:10 am, by Thus, it does not allow the temperature of cell to fall below 0°C and hence there is no damage to fresh fruits or vegetables. April 18, 2020, 2:22 am, by 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.) What was the temperature of the hot water? Question 24: Differentiate between heat capacity and specific heat capacity. Answer: Each 1 g of ice absorbs nearly 336 J of heat when melts to water at 0°C. ** A) 540 cal ** B) 540 * 10^4 cal C) 800 cal D) 8000 cal Is A correct? : latent heat of fusion: 14 calories / 113 KJ. Question 1: Derive an expression for finding out the specific heat capacity of a body (solid) from the readings of an experiment given below: Solution: Question 2: A body ‘A’ of mass m1 of a substance of a specific heat capacity c1 at a temperature θ1 is mixed with a body ‘B’ of mass m2 of other substance of specific heat capacity c2 at a lower temperature θ2. Answer: The heat required to convert 1 g of ice from 0°C to 1 g water at 0°C is 336J. Question 1: A piece of ice is heated at a constant rate. Answer: Due to high specific latent heat of fusion of ice, snow on the mountains does not melt all at once but changes into water slowely as it gets heat from the sun. 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. remains the same. Assume that all the heat from the heater is given: to the material. %PDF-1.6 %���� Question 22: Explain, why are big tubs of water kept in underground cellars for storing fresh fruit and vegetables in cold countries. Question 38: What is ‘Calorimetry’? Toluene: 0.380 calories per gram Answer: Heat is a form of energy, which when absorbed by a body makes it hot and when extracted from a makes it cold. Question 20: Explain, Why is it advisabile to pour cold water over burns, caused on human body, by hot solids? Question 5: Will the value of specific heat’capacity and specific latent heat of a substance change if the scale is °F instead of °C? Solution: Question 15: Calculate the total amount of heat required to convert 100g ice at 0°C to steam at 100°C. [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. Give reason for this observation. 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. It means that we need 2260 × 103 J of heat to convert 1 kg of water at its boiling point into steam. Answer: (i) Combustion of fossil fuels, (transportation, power generation etc.) Question 23: Explain, why is water used as a coolent in motor car radiators? It is measured in joule per kilogram. latent heat of fusion of 336,000 Jkg-1. Answer: The greenhouse effect contribute in trapping the sun’s heat energy within the atmosphere to maintain Earth’s surface at an average temperature of about 59°F (15°C) which is suitable for living human beings. Then initial temperature is noted. Calculate the final temperature of the mixture of water. Answer: X has higher specific heat capacity. How many calories of heat energy are required to melt 20 grams of ice at 0 °C? They always involve a transfer of heat, even though the temperature of the substance undergoing the phase change stays constant. Answer: The increase in temperature due to global warming will result in many new diseases because certain bacteria are more effective and multiply much faster in warmer temperatures as compared to cold temperatures. The solid chosen should be insoluble and non reactive with the liquid. GAVIN THOMAS Question 65: Explain the statement; “The specific latent heat of vaporization of wafer is 2260 × 103 J/kg”. Explain. Potassium: 0.019 calorie per gram Question 17: Explain, why temperature in hot summer, falls sharply after a sharp shower? When a farmer waters his fields, during, night, this water gives large amount of heat energy, because 1 g of water will liberate 4.2 J of energy for every 1°C fall in temperature. Question 1: What is heat? Solution: Question 11: A heater supplies heat at the rate of 800 J/s. Answer: Specific latent heat of vaporization is the quantity of heat required to convert unit mass of a substance from liquid to vapour state without change of temperature. 0.0924 calorie per gram Question 3: State two advantages of the high specific latent heat capacity of steam, which is about 226 × 104 J/kg? heat capacity × rise in temperature = m × s × (θ2 – θ1). 1,040 cal B. (iv) While passing steam, care must be taken that condensed steam does not escape out. Examples of latent heat. Question 10: Write two advantages of high specific heat capacity of water. How many joules of heat energy is liberated? April 18, 2020, 1:55 am, by latent heat of the metal? For example, the latent heat of vaporization of water is 540 cal/g and the latent heat of freezing of water is 80 cal/g. Question 1: A substance is in the form of a solid at 0°C. Solution: Heat released by 5 kg of steam at 100°C to convert into water at 100°C. (ii) a change in itsstate without any change in its temperature? The latent heat of vaporization of water is 2260 × 103 J/kg. We know that the supplied goes into breaking the bonds between the molecules, while the kinetic energy of the molecules remains unchanged. How is one led to this conclusion? 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.