Transcription of Chapter 10 Worksheet #2 Answer
1 Name _____KEY_____ Block _____ Chapter 10 Worksheet #2 1. Calculate the energy require (in calories) to heat g of mercury from to Specific heat of mercury is J/goC. q = m c t q = g J/goC oC = J 1 cal = cal J 2. If 50. J of heat are applied to 10. g of iron, by how much will the temperature of the iron increase? The specific heat of iron is J/goC. t = q / m c t =50. J / J/goC = 50 J goC = 11 oC J 3. Calculate the amount of energy required (in calories) to heat 145 g of water from to q = m c t q =145 g J/goC (75 oC oC) = 145 g J/goC oC cal = 7640 cal 4. If kJ of heat is heated to a kg block of metal, the temperature of the metal increases by Calculate the specific heat capacity of the metal in J/goC. c = q / m t convert units KJ = 52,500 J and kg = 1,020 g c =52,500 J / 1, oC c = J/goC = J/goC 5.
2 If x 103 J of heat is applied to a g sample of iron, by how many degrees Celsius will the temperature of the iron sample increase? Specific heat is J/goC. t = q / m c q = x 103 J / g J/goC = x 103 J goC = = oC or x 102 oC J 6. What was the initial temperature of a g iron bar if J of energy were applied resulting in a final temperature of The specific heat capacity of solid iron is J/goC. t = q / m c t = J / g J/goC = J goC = oC J oC oC = oC 7. Are the following processes exothermic or endothermic ? a. the combustion of gasoline in a car engine exothermic b. water condensing on a cold pipe endothermic c. CO2 (s) CO2 (g) endothermic d. F2 (g) 2 F (g) exothermic 8. Why does ice float on the surface of liquid water? It is less dense then water (the Crystallized structure).
3 9. Perform the following conversions. a. 850 cal to J J 850 cal x J = J 1 cal b. J to cal cal J x 1 cal = cal J
