Sugar Salt Lab Melting Points

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					                                                              __________________________
                                                                   Science Period ________
                                                                   Date _________________
                                                                              Mr. Anthony
                           Sugar & Salt Lab – DAY TWO
                  Investigating Covalent and Ionic Chemical Bonds
Hypothesis: PART TWO
I predict that the sugar/salt will have a higher melting point than sugar/salt because sugar/salt
has covalent/ionic bonds and will melt at a much higher temperature.

PART TWO: Data Table
                                Type of Bond vs. Properties
      Type of Electrolyte                      Melting Point in seconds (s)
              Sugar
               Salt

Variables: Part TWO
The independent variable is
The dependent variable is
The control will not

Conclusion: Part TWO (Hint: Use your “Chemical Bonding” Notes)
 The data supports / fails to support my hypothesis. The data shows that the sugar/salt will have
a higher melting point than sugar/salt because sugar/salt has covalent/ionic bonds and will melt
at a much higher temperature.

Apply: Use both Part One and Two to answer the questions.
1. Which compound has the chemical properties resembling a
  a) covalent bond-

 b) ionic bond-

2. What do you think would happen if we switched the positive (Red) and negative (Black)
   wires in the Part One procedure?


3. Was there a new substance formed in Part One? If so, what do you think caused it?


4. Why do you think the salt did not melt? What actions could you have taken to try to make it
   melt?
Procedure PART 2

Materials:
       1 small cup of sugar
       1 small cup of salt
       2 pieces of aluminum foil
       1 large plastic cup
       1 Sharpie Marker
       1 stop watch
       1 pair tweezers
       1 hot plate
                                  Two students to a group

Student Procedure:
   1. Make two aluminum foil dishes:
      Smooth each foil square down and around the bottom of an upside down cup to form a
      round dish.

   2. Retrieve the premeasured salt (cup A) and sugar (cup B).

   3. Use a sharpie marker to label one aluminum dish “sugar” and the second aluminum dish
       “salt”. Place the sugar into the sugar dish and salt into the salt dish.

   4. Two groups to a hot plate. Each group will use half of the hot plate.

   5. Both groups place both their salt and sugar dishes on the hot plate before turning the hot
       plate on.




   6. Turn the hot plate on to #2 low. Use stop watch to time how many seconds each
      substance will take to reach its melting point. If the time reaches 360 seconds then the
      substance will not melt. Use tweezers as soon as each substance starts to melt to
      remove that dish and throw it away into the garbage.
             ***Be careful the hot plate is on! Do not touch the heating coils***

   7.   Turn the hot plate off.

				
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