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Syllabus
Q.6. Find the result of mixing 10 g of ice at - 10C with 10 g of water at 10C. Specific heat capacity of ice = 2.1 J , specific latent heat of ice = 336 J and specific heat capacity of water = 4.2 J .
Ans. 0.625 g ice will melt and temperature will remain 0C.
Q(c). The temperature of 170g of water at 50°C is lowered to 5°C by adding certain amount of ice to it. Find the mass of ice added.
Given: Specific heat capacity of water = 4200 J kg–1°C–1 and specific latent heat of ice =336000 J kg–1
(i) Which liquid is a good conductor of heat? Why?
(ii) Which liquid is more suitable as a liquid in radiators for cooling?
Q. A calorimeter of mass 60 g contains 180 g of water at 29C. Find the final temperature of the mixture, when 37.2 g of ice at —10C is added to it (specific heat capacity of water = 4200 J/kg K, latent heat of ice = 336 x J/kg, specific heat capacity of ice = 2100 J/kg K, specific heat capacity of the calorimeter is 0.42 J/g ).
Q. What are background radiations?
Q. Write an equation of an a emission from ?
Q11. The amount of heat energy required to convert 1 kg of ice at – 10°C to water at 100°C is 7.77, 000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J kg–1 K–1, specific heat capacity of water = 4200 J kg–1 K–1.
Ans. 3,36,000 J kg–1
Q12. 200 g of ice 0°C converts into water at 0°C in 1 minute when heat is supplied to it at a constant rate. In how much time 200 g of water at 0 °C will change to 20°C ? Take specific latent heat of ice =336 J g–1.
Ans . 15 g
Q9. (a) (i) Write an expression for the heat energy liberated by a hot body.
(ii) Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding raise in temperature of the body as shown on the Kelvin scale ?
(iii) What happens to the average kinetic energy of the molecules as ice melts at 0°C
(b) A piece of ice at 0°C is heated at a constant rate and its temperature recorded at regular intervals till steam is formed at 100°C. Draw a temperature-time graph to represent the change in phase. Label the different parts of your graph.
(c) 40 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 60°C to 10°C. Find the mass of water used. (Specific heat capacity of water = 4200 J/kg K, Specific latent heat effusion of ice = 336 × 103 Jkg–1)
(iii) Give one example where high specific heat capacity of water is used for cooling purposes.
temperature of the mixture, when 37.2 g of ice at ?10 degree C is added to it (specific
heat capacity of water = 4200 J/kg K-1, latent heat of ice = 336000J/kg, specific heat capacity of ice = 2100 J/kg K-1, specific heat capaicity of the calorimeter is 0.42 Jg-1 degree C-1).
The vessel used for measurement is made of thin and sheet of copper
(SHC of water is 4200 J/kg/K & Specific Latent Heat of vaporisation of water is 2268000 J/kg)
Q.d) Calculate the mass of ice required to lower the temperature of 300 g of water at 40 to water at 0. (Specific latent heat of ice = 336 J/g. Specific heat capacity of water = 4.2 ).
Q.9.(ii) What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance?
PS : Sir please explain each step because I didn't understand all the steps in a solution given for this same sum earlier .....Thanks
(1) Heat energy imparted by water in fall of its temperature from 50?C to 0?C.
(2) Mass of ice melted.
(3) Final temperature of the mixture.
(4) Mass of water at 0?C in the mixture.
Given : Specific heat capacity of water=4200J/kg K , Specific heat of ice = 336 kJ/kg.
Please solve the above question taking the given values only.
Given SHC of ice is 2.1 J/g/degree Celsius and Specific heat of fusion of ice is 336 J/g
6 ohm joined in series. Find the electrical spent per minute in 6 ohm resistor.
8. 0.5 kg of lemon squash at 30oC is placed in a refrigerator which can remove heat at an average rate of 30 J s-1. How long will it take to cool the lemon squash to 5oC ? Specific heat capacity of squash = 4200 J kg-1 K-1.
Ans. 20 Min 10s
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1. The heat capacity of a body is 50 jk-?.
2.the specific heat capacity of copper is 0.4jg??k??