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Transcript of Thermodynamics
An Exothermic Reaction in Action!
Experiment #1: How to Crush a Pop can?
Experiment #1: Honey, I shrunk the Marshmallows!
What do you think of when you hear....
First Law of Thermodynamics
Now let's add water!
Real World Applications!
Hint: Why does the block feel colder?
Heat & Reactions
Measure of energy in a system (Joules)
Measure of average
of the atoms/molecules in a substance (Kelvin)
Using a hot plate, heat up about 25 mL of water (about 2 Tbsp) in an aluminum can.
*CAREFUL: Cold metal looks like hot metal!!!!!!
Once steam is visible, using
, pick up the can, flip it over, and dunk it in a dish of ice water
Step 3: Observe
What did you observe?
Why did this Happen?
Remove plunger from syringe.
Plug hole with finger and push in plunger
plugging hole, push plunger down
Plug hole and
pull plunger out.
Using a hot plate, heat water in a beaker.
When water reaches 90ºC (water should not be boiling), remove beaker from hot plate.
Push plunger all the way in and suck up water (about 3mL) using syringe.
Push plunger in until no air remains
Flip it over and plug the hole.
Slowly pull the plunger out.
Place blocks on table with ring on each block.
Touch each block and figure out which one is colder.
Place one ice cube on each block and observe.
Touch each block after ice has melted paying and observe the temperature of each
a reaction accompanied by or requiring the absorption of heat
a reaction accompanied by the release of heat
Ideal Gas Law
As the water is
, it turns to
Steam expands to fill container, increasing pressure.
steam condenses rapidly
, decreasing the pressure inside the can.
Pressure outside (1 atm) is
than the pressure inside of the can, the can
What would happen if a marble was used instead of a marshmallow?
The pressure that a gas exerts on its liquid/solid at the phase change quilibium
, the liquid will boil (gas will escape).
Delete this slide
High altitude cooking directions
Temperature of water and steam
Max Temp of Liquid
One block is made of aluminum and the other is made of high density foam
Aluminum is a better
Why does the aluminum block feel colder after the ice has melted?
Melting ice is
Which do you think is endothermic and which is exothermic?
Gummy Bears are Science!
How can we explain our result versus the result in the video???
I CAN GET PAID FOR THIS?