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| | | Subject: freezing point
Posted Jun 6, 2003 by Whisky
This is a reply to this Posting
| | Posting
3
  | | Nope, I think the first point is technically correct...
To explain it in a _very_ unscientific way (I'll probably get lynched by the next passing  after this one  )
Remove heat energy from water and for every unit of energy you'll get a corresponding drop in temperature, until you reach 0°C when the reduction in the energy in the water actually causes it to solidify rather than to reduce in temperature, once it's frozen - removing more heat energy once again results in a temperature decrease...
The graph looks something like this...
Temperature
|
|| | | | ------ (O°C)
| | __________________Energy decrease
(And if that graph actually works considering the limitations of posting formating on this site I deserve a  )
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|  |
| | | Subject: freezing point
Posted Jun 6, 2003 by Whisky
This is a reply to this Posting
| | Posting
4
| | Nope, I think the first point is technically correct...
To explain it in a _very_ unscientific way (I'll probably get lynched by the next passing after this one )
Remove heat energy from water and for every unit of energy you'll get a corresponding drop in temperature, until you reach 0°C when the reduction in the energy in the water actually causes it to solidify rather than to reduce in temperature, once it's frozen - removing more heat energy once again results in a temperature decrease...
The graph looks something like this...
Temperature
|
|| | | | ------ (O°C)
| | __________________Energy decrease
(And if that graph actually works considering the limitations of posting formating on this site I deserve a )
|
| |
| | | Subject: freezing point
Posted Jun 6, 2003 by chickadee (wheee!)
This is a reply to this Posting
| | Posting
7
| | high school chemistry: energy is required for something to change phase, that is, go form solid to liquid or liquid to gas. So if you are trying ot make ice, .... actually it's easier to explain raising the temperature. So say you want to melt some ice. Put in heat energy until it's 0° C. At this point, it's still solid. You continue putting energy into it, but the temperature stays the same. Huh? you say? All the energy is going into breaking the hydrogen bonds between the water molecules. After a bit, it will all be melted, and then the temperature will start to go up again. If you want, i can explain the interesting parts of boiling, too. And i'm going to attempt a little graph.
temperature is the vertical axis, going up.
_/
_/
/
energy put in ->
does that work? the horizontal spots are the phase changes, parts going up are solid warming then liquid warming then gas warming.
wow, i really am a  well, i had a reeeeally good chem teacher....and it was only last year....
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