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Thermodynamics

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by

Andreea Temelie

on 2 April 2016

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Transcript of Thermodynamics

Experiment #1: What melts faster?
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....

Thermodynamics?
Thermodynamics
Explanation
Useful Terms!
First Law of Thermodynamics
Gas Laws
Explanation!
Experiment #2:
Explanation!

Real World Applications!
Group Predictions
Hint: Why does the block feel colder?
Explanation
Heat & Reactions
Energy Diagrams
Pressure
- Force/Area
Volume
Heat-
Measure of energy in a system (Joules)
Temperature-
Measure of average
kinetic energy
of the atoms/molecules in a substance (Kelvin)

Step 1:
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!!!!!!

Step 2:
Once steam is visible, using
TONGS
, pick up the can, flip it over, and dunk it in a dish of ice water

Step 3: Observe

Predictions?
What did you observe?

Why did this Happen?

Step 1:
Remove plunger from syringe.
Step 2:
Insert marshallow
Step 3:
Plug hole with finger and push in plunger

Part 2

Step 1:
Remove plunger
Step 2:
Insert marshallow
Step 3:

WITHOUT
plugging hole, push plunger down
Step 4:
Plug hole and
SLOWLY
pull plunger out.
Part 1
Step 1:
Using a hot plate, heat water in a beaker.

Step 2:
When water reaches 90ºC (water should not be boiling), remove beaker from hot plate.

Step 3:
Push plunger all the way in and suck up water (about 3mL) using syringe.

Step 4:
Push plunger in until no air remains
Step 5:
Flip it over and plug the hole.
Step 6:
Slowly pull the plunger out.
Step 1:
Place blocks on table with ring on each block.

Step 2:
Touch each block and figure out which one is colder.

Step 3:
Make predictions!!!!!

Step 4:
Place one ice cube on each block and observe.

Step 5:
Touch each block after ice has melted paying and observe the temperature of each
Endothermic Reaction:
a reaction accompanied by or requiring the absorption of heat

Exothermic Reaction:
a reaction accompanied by the release of heat
Boyle's Law
Charles' Law
Gay-Lussac's Law
Ideal Gas Law
HEAT
does
NOT
always increase
TEMPERATURE
As the water is
heated
, it turns to
steam
.

Steam expands to fill container, increasing pressure.

When
cooled
, the
steam condenses rapidly
, decreasing the pressure inside the can.

Pressure outside (1 atm) is
larger
than the pressure inside of the can, the can
implodes
!!!
Part 1
Part 2
Increase
Pressure
Decrease
Volume
Decrease
Pressure
Increase
Volume
What would happen if a marble was used instead of a marshmallow?
Increase
Volume
Decrease
Pressure
Vapor pressure:
The pressure that a gas exerts on its liquid/solid at the phase change quilibium
If
vapor pressure
is
larger
than the
atmospheric pressure
, the liquid will boil (gas will escape).

Delete this slide
High altitude cooking directions
Pressure cookers
Increase
Pressure
Increase
Boiling Point
Increase
Temperature of water and steam
Decrease
Cooking time
Decrease
Pressure
Decrease
Boiling Point
Decrease
Max Temp of Liquid
Increase
Cooking Time
One block is made of aluminum and the other is made of high density foam
Aluminum is a better
CONDUCTOR
Why does the aluminum block feel colder after the ice has melted?
Melting ice is
ENDOTHERMIC
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???
Physical
Analytical
Organic
Inorganic
Biochemistry
Materials
I CAN GET PAID FOR THIS?
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