When two objects of different warmth are in contact with each other, heat is exchanged between them to come into thermal equilibrium. Specific latent heat of fusion of ice = 336 × 103 J kg-1 Specific heat capacity of copper vessel = 400 J kg-1 °C-1 Specific heat capacity of water = 4200 J kg-1 °C-1. Answer: Ice has the highest sp. The unit of warmth in the SI method is ‘Kelvin’and Degrees Celsius in the CGS method. // -->, Thermal Conductivity of Common Metals and Alloys, GD&T Training Geometric Dimensioning Tolerancing. 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? Question 7: 250 g of water at 30 °C is present in a copper vessel of mass 50 g. Calculate the mass of ice required to bring down the temperature of the vessel and its contents to 5 °C. DFM DFA Training Also, the zero in front of the decimal point assures that the reader will know it is a decimal point and not a fly speck.). Thus, no frost is formed. (ii) Hot water bottles are used for fomentation. Thus, specific heat capacity depends upon the nature of the substance also and so its is different for different substances. Change ), You are commenting using your Facebook account. Change in temperature of 1 g of ice at - 10 0 C when heat is supplied to it. Since the specific heat of steam is 0.48 cal/g-oC, that means that 0.48 calories are needed to raise 1g up 1oC. (ii) If its sp. Specific heat capacity ‘B’ 0.4 J/g/K ‘B’ is a good conductor of heat. 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. Question 50: Why does atmospheric temperature fall after hail storm? Thirst is the natural signal, when body produces more heat energy than required. 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. Question 39: State the principle of calorimetry. 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. Specific Heat Capacity of Metals Table Chart. Give an explanation for your answer. The reason is that energy must be expended to change the state from solid to liquid or from liquid to gas. Related to Circles, Introduction But in the process of melting, it takes comparatively longer time. Although energy is typically measured in joules, a more common unit for heat is the calorie, which is defined as the amount of heat required to change the temperature of 1 gram of water by 1 Celsius degree. The heat exchange between the two objects does not depend on their total heat. Then the mass of calorimeter with water and ice is again weighed. 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. (Specific latent heat of fusion of ice = 336 J/g, specific latent heat of vaporisation of steam = 2260 J/g, specific heat capacity of water = 4.2 J/g°C). Question 34: Name the liquid which has the highest specific heat capacity. Answer: The measurement of the quantity of heat is termed as colorimetry. Its thermal conductivity is `0.0075 cal//cm sec^(@)C`. The water gives off 4200 J of heat energy for every one kg for 1°C fall is temperature. That means that 1g of water requires 540 cal of heat to boil. (ii) Intermolecular space increases. Answer: (i) The specific latent heat of fusion of ice is 3,36,000 J/Kg. That means ice water will remain at 0oC (32oF) until all the ice is melted. Answer: Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and water vapours. Answer: Specific heat capacity ‘A’ 3.8 J/g/K. The chart below shows the latent heat or energy required to change the states of water. It is given that the specific heats of water and ice are 1 kcal/kg per Â°c and 0.6 kcal/kg per Â°c while the latent heat of fusion of ice is 80 kcal/kg Solution: Question 5: How much heat energy is released when 5 g of water at 20° C changes to ice at 0° C? The latent heat for melting ice is 80 cal/g. The warm object tends to dissipate heat and the cooler object receives heat. Question 23: Explain, why is water used as a coolent in motor car radiators? Hence, if they do not put on extra clothes, they are likely to catch cold. 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. The reason is that lg steam at 100°C, when converts to 1 g water at 100°C, liberates 2260 J heat. Question 45: Write an expression for the heat energy liberated by a hot body. The specific heat often varies with temperature, and is different for each state of matter. Engineering Videos If it is assumed that no heat was wasted during acceptance and exclusion, the cooling object receives the same amount of heat as the warm object will discard. 2. How much heat is required? There are usually two types of thermometer scale, namely. Answer: Specific latent heat of fusion: The specific latent heat of fusion of a substance is the heat energy released when a unit mass of substance converts from liquid to solid state without the change in temperature. It is thus heat per unit mass and does not depends upon the scale of temperature used. Thus, it would take 50 x 0.50 calories to raise 50g up 1oC and 10 x 50 x 0.50 = 250 cal to raise the ice to its melting point. Specific Heat Capacity of Metals Table Chart . 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. Know UK board 2021 exam date sheet & others details here. Answer: The frost can seriously damage the leaves and fruit of plants. Question 18: Explain, why do sandy soils, get heated up quickly as compared to wet soils? Don't be wasteful; protect our environment. 2 c a l / g m / ∘ C) Warmth remains the same when conditions change. Please include it as a link on your website or as a reference in your report, document, or thesis. Online Books & Manuals Solution: Question 17: If there is no Heat loss to the surroundings, the heat released by the condensation of m1 g of steam at 100°C into water at 100°C can be used to convert m2 g of ice at 0°C into water at 0°C. It is because water absorbs large amount of heat energy, but its temperature does not rise sufficiently. We want to heat the material until it all turns to steam at 110oC. Under this high pressure, ice melts to form water below 0°C. (i) Heat capacity of lead piece, (ii) Specific heat capacity of lead. Question 2: Define the term calorie.