Download Calorimetry: Heat of Fusion of Ice Procedure In a 250 mL beaker

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Transcript
Calorimetry: Heat of Fusion of Ice
Procedure
In a 250 mL beaker, heat about 125mL of water to a
temperature of about 50oC. Measure exactly 100mL of this
heated water in a graduated cylinder and pour it into a
Styrofoam cup. Record this volume of water. Measure
accurately and record the temperature of the water.
Immediately add 2-3 ice cubes. Stir the mixture carefully. The
cup should contain ice at all times. If the last of the ice is about
to melt, add another ice cube. Monitor the temperature of the
mixture as you stir. Continue stirring until the temperature no
longer drops. Record this final temperature. Carefully remove
the unmelted ice. Allow any water removed to drain back into
the cup. Measure and record the volume of the water in the
cup.
Discussion:
1. In what way does calorimetry make use of the law of
conservation of energy?
2. Use the following terms: exothermic, endothermic, heat of
fusion, specific heat
3. Is the process of melting exothermic or endothermic?
Give evidence to support your answer.
4. Discuss is the difference between heat and temperature?