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Name: Date: Period: Ch 11 Worksheet 1 - Heat Capacity and Specific Heat May 6, 2008 Remember: 1 calorie = 4.184 joules 1000 joules = 1 kJ 1000 calories = 1 kcal 1. Make the following conversions: a. 8.5 x 102 cal to kcal b. 444 cal to J c. 1.8 kJ to J d. 4.5 x 10-1 kJ to cal Remember: Heat capacity = joules / ºC for an object (J/ ºC) Specific heat capacity = joules / ºC per gram of substance (J / g ºC) 2. The heat capacity of a 78.0 g chunk of a certain type of glass is 41.3 J/ºC. What is the specific heat capacity of this glass? 3. How many kilojoules of energy are in a doughnut that contains 200.0 kcal? Remember: Δq = m c ΔT 4. What is the specific heat of a substance that has a mass of 25.0 g and requires 525.0 calories to raise its temperature by 15.0 ºC? 5. Suppose 100.0 g of H2O(s) absorbs 1255.0 J of heat. What is the corresponding temperature change? 6. How many joules of heat energy are required to raise the temperature of 100.0g of aluminum by 120.0 ºC? 7. How much energy must be absorbed by 20.0 g of water to increase its temperature from 53.0 °C to 83.0 °C? 8. When 15.0 g of steam drops in temperature from 275.0 °C to 250.0 °C, how much heat energy is released? c(steam) = 1.70 J/gC 9. If 720.0 g of steam at 400.0 °C absorbs 800.0 kJ of heat energy, what will be its increase in temperature? 10. How much heat (in kJ) is given out when 85.0 g of lead cools from 200.0 °C to 10.0 °C? (Cp of lead = 0.129 J/g °C) 11. If it takes 41.72 joules to heat a piece of gold weighing 18.69 g from 10.0 °C to 27.0 °C, what is the specific heat of the gold? 12. A certain mass of water was heated with 41,840 Joules, raising its temperature from 22.0 °C to 28.5 °C. Find the mass of water.