Anyone who lives in a section of the country where
highways freeze probably knows that salt is sometimes sprinkled on the roadways to
promote melting of the ice. From this knowledge, or other observations, or perhaps
through reasoning such as that included in the reference, one might come up with the
hypothesis that salt promotes melting of ice.
Your
hypothesis should be stated clearly and briefly such as the
following:
Hypothesis: Exposure of ice to salt will
increase the speed at which the ice melts.
You would then
outline your experiment, perhaps in a fashion similar to the
following.
Method: Ice cubes freshly removed from the
freezer will be placed in several glasses of salted water, all of which are at room
temperature. The salt concentration in each glass will be recorded. Two ice cubes will
be placed in each glass simultaneously. The glasses will be recorded by a video camera
such that the time at which the ice cubes in each glass disappear can be measured. The
results will be expressed as melting times plotted against salt concentration. In this
manner the hypothesis will be tested.
Please see the
reference for a good description and tutorial on the scientific basis underlying the
fact that salt does indeed speed up the rate at which ice melts.
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