Chemistry Music Video 6: Heating Curve





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Uploaded on Aug 29, 2009

This song describes the physical changes and the molecular characteristics of water as it undergoes phase changes from solid to liquid to gas, and what happens to temperature as the change progresses. All music and lyrics copyright 2007 by Mark Rosengarten. All rights reserved.


Molecules of solid just vibrate in their place
As you add some heat they vibrate at a faster pace
The temperature increases, nice and steadily
To calculate the joules you need, use Em Cee Delta Tee

But once the solid heats up to melting temperature
They start to move too fast to stay together any more
The temperature stays constant as the melting moves along
Using heat of fusion to get joules for this aint wrong!

To melt a solid you must add heat at a steady rate
(Sounds like this change is endothermic, dont you think so, mate?)
Once all the solids melted and liquids all you got
Temperature will rise once more, until it gets real hot!

The molecules of liquid then move faster with more heat
The liquid gets less viscous, and easier to beat
To get the joules you need to make the temperature to rise
Use Em Cee Delta Tee once more, and now heres a reprise

Em Cee Delta Tee!
Em Cee Delta Tee!
Em Cee Delta Tee!
Thats Calorimetry, yo!

When the vapor pressure of the liquid gets so high
That it equals the surrounding pressure thats coming from the sky
Then the liquid starts to boil, bubbles start to form
The temperature stops rising, although it feels real warm!

As the liquid molecules break free and form a gas
Heat of vaporization is what you need, alas
This change is endothermic, heat will get sucked in
Attractive forces disappear, let gaseous phase begin!

So that is how a heating curve can be made in the lab
Now you can go tell all your friends, this secret you can blab
Heating stuff from solid to a liquid to a gas
Is an endothermic process, I hope you had a blast!

If you cool the gas down, it condenses then it freeze
If it makes it up your nose, then it might make you sneeze
Cooling down the substance is an exothermic change
The graph you get is opposite, so dont think it looks strange!

So now you know all that you need about solids, liquids gas
And how all the change in phase really comes to pass
Going up in phase is done endothermically
Exothermic down in phase, I hope you all can see!



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