Three interesting questions to ponder

[robert zellmer]

1)

Last night I removed a bottle of pop (Coke, Pepsi, etc.) from my
freezer.  The liquid showed no signs of ice formation.  I swirled
the bottle a little to equilibrate the temperature.  As soon as
I opened the bottle the pop turned to slush (i.e. ice formed).

Why?  Give a good reasonable explanation.  There is one from
chapter 11 and one from chapter 13.

If you want to try this for yourself, here's what to do.
Take a BOTTLE of pop (you need to be able to see inside).
Put it in the freezer.  Check on it periodically.  Let it
freeze a little.  Take it out and let it warm up until the
last piece of solid melts (swirl gently).  As soon as this
occurs open it and see what happens.

2)

Why do instructions for steam irons usually state to use tap
water and not distilled water?

3)

When it gets really cold out and there's a bad snowstorm
they use CaCl2 instead of NaCl on the roads.  Why?  I kind
of already talked a little about this last week.

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