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Home
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
Unit 9
Unit 10
Unit 11
Contact
Unit 7:
Gas Laws
Pressure:
Gases exert a pressure, or a force, on any surface with which they are in contact
Pressure (P) is the force (F) that acts as the given are (A)
Formula:
P = F/A
Temperature:
Measurement of the Heat Content or Particle Motion of matter
When canted it causes the volume of the matter to change
Boyle's Gas Law:
Established by Robert Boyle
States that the volume of a fixed gas that is maintained at CONSTANT temperature is inversely proportional to the pressure
When two measurements are inversely proportional, one gets smaller as the other will get bigger
Formula:
P
1
V
1
= P
2
V
2
Charles' Gas Law:
Established by Jacques Charles
States that the volume of a fixed amount of gas maintained at a CONSTANT pressure is directly proportional to it absolute temperature
When two measurements are directly proportional, as one changes in size the other undergoes the same size
Formula:
V
1
=
V
2
a
T
1
T
2
Combined Gas Law:
Boyle's Law and Charles' Law are combined and used together when the temperature AND pressure change
Formula:
P
1
V
1
=
P
2
V
2
a
T
1
T
2
Dalton's Law of Particle Pressure:
Total pressure exerted by a mixture of gases EQUALS the sum of the pressure of each gas if it were alone
Partical Pressure:
The pressure that is exerted by the particular component of a mixture of gases
Formula:
P
Total
= P
1
+ P
2
+ P
3
Dalton's Law with Water:
Helpful when collection a gas over water
Gas collected over water is a mixture of the gas and water vapor
Formula:
P
Total
= P
Gas
+ P
H
2
O
Amedeo Avogado:
States the volume of a gas maintained at a CONSTANT temperature and pressure is directly proportional to the number of moles of the gas
Formula:
V
1
=
V
2
z
n
1
n
2
Helpful Hints:
All gas calculations MUST use Kelvin temperatures
Read the problem and find what conditions are changing
Decide what law to use and write it down
Plug numbers into Law equation
Always apply your Significant Figures
Dalton's Laws