What is the difference between energy, heat and temperature?

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Presentation transcript:

What is the difference between energy, heat and temperature? What is the difference between exothermic and endothermic processes? If you have an ice cube in a glass of water, label the system, surroundings and indicate the type of process (exothermic or endothermic.)

Name the following phase changes and identify each of them as either an endothermic or an exothermic process. Phase change Name Endo- or Exo a. solid - liquid____________________________ b. liquid – solid _____________________________ c. liquid - gas __________________________________ d. gas - liquid _________________________________

When a 58.8 g piece of hot alloy is placed in 125 g of cold water in a calorimeter, the temperature of the alloy decreases by 106.1 C and while the temperature of the water increases by 10.5C. What is the specific heat of the alloy? (cwater=4.184 J/g C)

How much energy is required to change 54g of ice at -15C to steam at 130C? Hfus= 6.01 kJ/mol Hvap= 40.7 kJ/mol Cwater (s) = 2.03 J/gC Cwater (l) = 4.184 J/gC Cwater g) = 2.01 J/gC