Honors Chemistry                                                                        Name_____________________________

Calorimetry Problems and Questions

Mr. McAfoos                                                                                 Period_________ Date________________

 

  1. A student heats 258.3 g of water 67.3oC. Ice is then added. If the water cools down to 0.00oC and all of the ice melts, what is the mass of the ice added? (∆Hfus of ice is 79.71 cal/g)
  2. A 17.3 g piece of aluminoom (an aluminum-like metal) is heated to 187.6oC. It is then placed on a 12.45 g piece of cipper (a copper-like metal) at –17.3oC. What is the final temperature of the cipper? (specific heat of aluminoom = 0.244 cal/goC and the specific heat of cipper = 0.0997 cal/goC)
  3. Write out the mathematical steps required to answer the following question. DO NOT solve it. Be sure to label what numbers are equal (and which are not equal). How much heat must be removed from 517.3 g of steam at 925.3K to cool it until it is ice at 92.53K?
  4. A 16.8 g piece of steyl (like steel, only different) is heated to 98.3oC and is dropped into 419.58 g of water at 87.32 oC. If the specific heat of steyl is 0.084 cal/g oC, what will the final temperature of the steyl be?
  5. When a frost warning is given in Florida the orange growers often flood their orchards and shower the tree with water before the cold hits. Why might they do that ?
  6. A scientist becomes frustrated with how quickly his coffee cools down and as a result she invents Anti-ice. Anti-ice looks like plastic ice cubes but instead of containing frozen water, they contain melted wax. When they are dropped into a drink the wax freezes, warming the drink. If Anti-ice containing 58.3 g of wax are dropped into 846.2 g of coffee (same specific heat as water) at 54oC and the coffee heats up to 93oC, what is the heat of fusion of wax?
  7. A 38.11g piece of plastic is cooled to -81.31oC and then dropped onto a 422.5 g piece of copper at 421.8oC. If the specific heat of copper = 0.086 cal/goC and the specific heat of the plastic is 0.114 cal/goC, what will the final temperature be?
  8. If 38.66 g of melted wax are allowed to freeze. If all of the heat releases is given to 358.9 g of water at 25.99oC and the water warms up to 54.77oC, what is the heat of fusion of the wax?
  9. If 38.77g of molten wex (a mythical wax-like substance) is allowed to crystallize and all of the heat is transferred to 45.88 g of aluminum (specific heat of 0.88 J/g oC) the temperature of the aluminum goes from 38.6oC to 158.9oC. What is the heat of fusion of wex?
  10. Why is hot cocoa more effective at warming you up on a cold day than toast, given that toast can be over 250oC and cocoa can't be over 100oC?
  11. Why do the seasons in Philadelphia lag behind the sun (our hottest day is a month or two after our longest day)?
  12. Would you expect the seasons in North Dakota to be more in line with the sun than Philadelphia’s or less? Why?
  13. Bermuda is about as far north as North Carolina, yet NC has seasons and Bermuda doesn’t. Why?
  14. If you were stuck in Alaska and wanted to find a vineyard (they grow grapes for wine) where would you look? (Please DON’T tell me city names…I want geographical information.) Explain your answer
  15. Waterbeds have heaters. What would happen if they didn’t? Why don’t regular beds have heaters?