Science Period ________
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)
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
Procedure PART 2
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
1. Make two aluminum foil dishes:
Smooth each foil square down and around the bottom of an upside down cup to form a
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
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.