Download First Law of Thermodynamics

Boiling
•Is not a temperature
•It is a pressure
•Pressure above the
liquid=pressure from
particles leaving the
surface
Triple Point
The point in which all
three states of matter
exist
Phase Diagram
Sublimation
•Going from a solid to a
gas without going
through the liquid phase
•Or the other way around
First Law of
Thermodynamics
Energy cannot be
created or destroyed
Second Law of
Thermodynamics
The disorder of the
universe is increasing
Third Law of
Thermodynamics
• Kelvin Scale
• Measure kinetic energy
directly
• At absolute zero, all motion
stops (0 K or -273.15˚C)
Measuring Heat
We use the change
in temperature to
help measure heat.
Calorie
The energy
required to raise 1
gram of water 1
degree Celsius.
Joule
•The international
system of measuring
energy
•1 cal = 4.184 Joule
Specific Heat
The amount of heat
required to raise the
temperature of one
gram of that substance
by one degree Celsius.
Specific Heat
q = c x m x ∆T
q = the heat absorbed or released
c = the specific heat of the substance
m = the mass of the sample in grams
∆T = the difference between the final
temperature and the initial temperature
(Tfinal – Tinitial)
Enthalpy
•A measure of heat
content
•for one mole
Heat of Fusion
The amount energy to
change the state of
matter between solids
and liquids
Heat of Vaporization
The energy to change
the state of matter from
liquid to gas
Heat of Reaction
The amount of heat
involved in a chemical
reaction.
Heat of Combustion
The amount of heat
formed in the
combustion of a
compound.
Endothermic
ΔH is positive
Endothermic
•Heat flows in
•Feels colder
Exothermic
•Heat flows out
•Heat exits
•Feels hot
Exothermic
ΔH is negative
ΔH of reaction