Hot cold lab_recap
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Transcript of Hot cold lab_recap
Hot and Cold Lab Recap
Boiling water graph
Time in seconds
Temperature in C
At 100 degrees the water begins
to boil.
What’s happening?The water rises steadily until it reaches 100
degrees.It levels out at 100Why does the water temperature not rise
above 100 degrees even if you keep heating it? (where is that energy going?)
BoilingBoiling is when you change a liquid to a gas
by giving it enough heat (ENERGY) so it can break free of the attraction it has to the other water droplets.
When water reaches 100 degrees, some of the water molecules get enough energy to turn into a gas. If you kept heating it, more and more of the liquid would be boiling and becoming a gas.
Freezing water graph
Time in seconds
Temperature in C
At zero degrees the
water begins to freeze
When the water is totally
frozen the temperature
begins to drop again
What’s Happening?When you cool the water down you are taking
energy from it! (Remember, the salt melts the ice on the outside, so it takes energy to turn the ice into a liquid).
Why does the temperature flat line and then drop?
FreezingThe temperature drops once the ice is frozen
solid. Zero degrees is when the water begins to
turn to ice. When it starts dropping again the ice is frozen solid and the energy that is being stolen can go towards lowering the temperature of the solid.