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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Here are three interesting questions you should be able to answer<br>
at this point based on things which have been discussed in<br>
chapters 11 and 13.<br>
<br>
1)<br>
<br>
Last night I removed a bottle of pop (Coke, Pepsi, etc.) from my<br>
freezer. The liquid showed no signs of ice formation. I swirled<br>
the bottle a little to equilibrate the temperature. As soon as<br>
I opened the bottle the pop turned to slush (i.e. ice formed).<br>
<br>
Why? Give a good reasonable explanation. There is one from<br>
chapter 11 and one from chapter 13. It is not a supercooled<br>
liquid.<br>
<br>
If you want to try this for yourself, here's what to do.<br>
Take a BOTTLE of pop (you need to be able to see inside).<br>
Put it in the freezer. Check on it periodically. Let it<br>
freeze a little. Take it out and let it warm up until the<br>
last piece of solid melts (swirl gently). As soon as this<br>
occurs open it and see what happens.<br>
<br>
2)<br>
<br>
What's one reason to use tap water rather than distilled<br>
water in a steam iron?<br>
<br>
3)<br>
<br>
When it gets really cold out and there's a bad snowstorm<br>
they use CaCl2 instead of NaCl on the roads. Why?<br>
<br>
<br>
Have fun. Like you have NOTHING else to do with your<br>
time. I'll discuss #1 in class on Mon (don't let me forget)<br>
and send an e-mail about #2 and #3.<br>
<br>
Dr. Zellmer <o:p></o:p></span></p>
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