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Transcript
Worksheet “Heat and Temperature” 1) How much energy would be needed to heat 450 g of copper metal from 25.0 ºC to 75.0 ºC? The specific heat of copper at 25.0 ºC is 0.385 J/g ºC. 2) The specific heat of iron is 0.454 J/g ºC. How much heat is needed to raise the temperature of 20 g of iron by 50. ºC? 3) If the specific heat of aluminum is 0.874 J/g ºC, how much heat is given off when 10 g of aluminum is cooled from 50. ºC to 10. ºC? 4) How much energy needs to be added to 100. g of water to raise its temperature from 40. ºC to 60. ºC? 5) If 2.34 g of a substance at 22 ºC with a specific heat of 0.93 J/g ºC is heated with 29.65 J of energy, what is the new temperature of the substance? 6) How much heat is needed to change 2.0 kg of ice at 0°C to liquid water at 0°C? 7) How much heat is needed to change 0.50 kg of liquid water at 100°C to steam at 100°C? 8) How much heat does a refrigerator need to remove from 1.5 kg of water at 20.0 °C to make ice at 0°C? 9) A 1.0 kg aluminum block has an initial temperature of 10.0°C. What will the final temperature of the aluminum block be if 3.0 x 104 J of heat is added? The specific heat of aluminum is 0.90 J/g ºC. 10) What is the specific heat of a 36.359 g-sample of an unknown material when 59.912 J of heat are applied and raise the temperature by 152.0°C? 11) What would be the final temperature of a 73.2 g sample of cobalt with an initial temperature of 102.0°C, after it loses 6800 J? The specific heat of cobalt is 0.4210 J/g °C.