EDULABZ INTERNATIONAL. Heat ASSIGNMENT
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1 Heat ASSIGNMENT 1. Fill in the blank spaces by choosing the correct words from the list given below : List : substance, thermal capacity, mass, latent, heat, cold, constant, water, J C 1, fusion, hot. (a) When a hot body is in contact with a cold body, the heat energy lost by... body is, always equal to heat energy gained by... body. (b) The amount of heat energy required to heat 1 gram of... through 1 C, is called specific... capacity. (c)... is the product of mass and specific heat capacity. (d) The specific heat capacity of a substance is a... quantity, but the heat capacity of same substance changes with the change in... (e) The heat energy required to change a solid at its melting point into a liquid state, without any rise in temperature, is called... heat of... (f) The specific heat capacity of... is 4.2 J g 1 C 1. (g) The unit of thermal capacity is Statements given below are incorrect. Write the correct statements : (a) The melting point of ice and freezing point of water have different numerical values. (b) During vaporisation, a liquid changes into gaseous state rapidly with the fall in temperature. (c) Land and sea breezes are formed due to high latent heat of water. (d) The thermal capacity of a substance is the product of mass and rise in temperature. (e) Ice has the highest specific heat capacity, i.e., 4.2 J g 1 C 1. (f) Temperature changes during the change of state from liquid to gas. (g) The hot body always gains heat, whereas cold body always loses heat. (h) The heat capacity of water is always 4.2 J g 1 C 1. (i) When ice melts to form water, the heat supplied is stored in ice. (j) The unit of specific heat capacity is J C 1. 1
2 3. Write True or False in front of statements given below : (a) Kilocalorie is the amount of heat energy required to raise the temperature of 1 kg of water though 1 C. (b) Heat required to raise the temperature of given mass of substance through 1 C is called specific heat capacity. (c) The SI unit of specific heat capacity is J/kg C (d) More is the specific heat capacity of a substance, more is the rise in temperature for given amount of heat. (e) Heat energy required to melt 1g of ice at 0 C to form water at 0 C is 2260 J. (f) Land and sea breezes are caused due to high specific heat capacity of water. (g) 1 calorie is equal to 2.4 J. (h) The temperature at which a liquid changes into solid, is called solidification point. 4. Tick ( ) the most appropriate answer. (a) The SI unit of latent heat is : (i) J/g C (ii) J/ C (iii) J/kg (iv) J/kg C (b) The amount of heat required to raise the temperature of 1 g of a substance through 1 C, is known as : (i) calorie (ii) heat capacity (iii) latent heat (iv) specific heat capacity (c) The specific latent heat of fusion of ice is : (i) 4.2 J/g C (ii) 4200 J/kg C (iii) 336 J/g (iv) J/g (d) During snow storm, the atmosphere gets : (i) warm (ii) cold (iii) very cold (iv) very hot (e) Sea breezes blows : (i) during day only (ii) during night only (iii) throughout day and night (iv) none of these (f) The liquid used as a coolant in automobile engines is : (i) alcohol (ii) engine oil (iii) water (iv) benzene 2
3 (g) 10 g of substance is heated through 1 C. If the specific heat capacity of substance is 0.8 J/g C, the thermal capacity of substance is : (i) 80 J/ C (ii) 8 J/ C (iii) 800 J/ C (iv) none of these (h) During land breeze, the land is : (i) cooler than sea (ii) warmer than sea (iii) at the same temperature as sea (iv) none of these (i) Conversion of steam into water, is an example of : (i) condensation (ii) evaporation (iii) freezing (iv) vaporisation 5. Find the odd one out. Give a reason for your choice. (a) heat absorbed, rise in temperature, mass, density of substance. (b) J/g C, J/kg C, Cal/g C, J/kg. (c) calorie, joule, kilocalorie, pascal. 6. (a) Define heat energy. (b) How does heat energy flow from one body to another body in contact with it? 7. (a) Define the following terms : (i) Calorie (ii) Kilocalorie (b) Name the modern unit for the measurement of heat energy. (c) State the relation between the joule and calorie. 8. State three factors which determine the quantity of heat energy absorbed by a body. 9. (a) What do you understand by the term specific heat capacity? (b) Name a substance having highest specific heat capacity and state its magnitude. (c) The specific heat capacity of a substance is 2160 Jkg 1 C 1. What do you understand from the above statement? 10. (a) What do you understand by the term heat capacity? (b) A substance P has thermal capacity of 2513 J/ C. What do you understand from the above statement? (c) Write the mathematical expression for the heat capacity. 3
4 11. Why do we use hot water, instead of any other liquid, in hot water bottles? 12. Why do we sprinkle water on roads, in hot summer months? 13. Why a wet bandage is applied on forehead of a person, running high fever? 14. What do you understand by the term latent heat of fusion of a solid? 15. Define the following terms : (a) Fusion (b) Solidification (c) Freezing point (d) Vaporisation (e) Boiling point 16. (a) Define specific latent heat of fusion of ice : (b) State SI unit of specific latent heat of fusion of ice. 17. Explain, why ice at 0 C feels colder than water at 0 C? 18. Explain, why soft drink bottles cool better in ice than water at 4 C? 19. Explain, why weather becomes pleasant during snowfalls. 20. Explain, why it becomes bitterly cold after hail storm. 21. Explain, why is steam used in order to convert thermal energy of coal into electric energy at the thermal power stations. Numerical Problems 1. Calculate the amount of heat energy required to raise the temperature of 50 g of lead of specific heat capacity 0.13 J g 1 C 1 from 27 C to 327 C. 2. Calculate the amount of heat energy required to prepare a water bath of 15 kg at 45 C, when initial temperature of water is 5 C. The specific heat capacity of water is 4200 J kg 1 C g of water at 80 C is cooled to 30 C. If the specific heat capacity of water is 4.2 J g 1 C 1, calculate the heat energy given out by the water. 4. Zinc at 420 C is cooled to 20 C. If the mass of zinc is 25 g and its specific heat capacity is 0.65 J g 1 C 1, calculate the heat energy given out by zinc. 4
5 g of water at a temperature of 5 C is supplied with 58,800 J of heat energy. If the specific heat capacity of water is 4.2 J g 1 C 1, calculate the final temperature of water ,000 J of heat energy is supplied to 250 g of copper at 25 C, when the final temperature recorded is 625 C. Calculate the specific heat capacity of copper. 7. A liquid X has specific heat capacity 1255 J kg 1 C 1 and mass 0.80 kg. What is its thermal capacity? 8. Calculate the thermal capacity of 5 kg of water J of heat energy is supplied to a solid of specific heat capacity 0.45 J g 1 C 1. Calculate the mass of the solid. 10. Calculate the specific heat capacity of a solid of mass 55 g, if the heat required to raise its temperature through 1 C, is J. ANSWERS 1. 1,950 J 2. 25,20,000 J 3. 94,500 J 4. 6,500 J C J g 1 C J C ,000 J C g J g 1 C 1 5
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