Hypothesis: As the water freezes it will expand but not at a dramatic rate nor amount. As more salt is added to the water the lower the temperature will need to be for the water to freeze.
Constants:
-Every cup will contain 1 cup of tap water
-The same kind of cup will be used for each test
-All of the cups will be placed outside for 3 hours and be tested every hour
Variables:
-The amount of table salt (NaCl) in each cup will vary by 1/2 tsp
Results: The cup containing no salt froze the fastest (first signs of freezing at the 2 hr mark) and constantly maintained a higher temp than the other cups. The cup containing 1/2 tsp. of salt was close to follow the control cup in freezing. The last two cups did not freeze but formed and maintained a slush like consistency (results are represented in the graph above). The results of the amount of expansion is represented in the chart to the right; which shows that the unsalted water has a steadier expansion rate than any of the other cups with salt.
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