Marcel slowly heated cold water until
it boiled, and he checked the temperature every minute. He recorded his results
in the data table below.
23. Marcel repeated the first experiment a third time, but
this time added salt to the water. As a result of the addition of salt, he should
expect the temperature by the end of the experiment to be:
a) Higher than 100*C.
b) Lower than 100*C.
c) Still at 100*C.
d) There is no way to predict what it should be in this case.
The best answer is answer a.
Adding any solute (chemical which dissolves
in water) to water raises its boiling temperature above normal. That's why adding
salt to water when boiling spaghetti speeds up the cooking time. It raises the
boiling time to a higher temperature, thus cooking faster!
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Slichter