Unit B: Gas Laws Outcome 1 Flashcards
Chemical Properties
A property that can be seen from a chemical change
Example: Lighting a piece of paper on fire., I can’t get it back to its original shape
Physical Properties
A property that can be seen without a chemical change
Example: Folding a piece of paper, I can still get it back to its original shape
Pressure
force exerted on an area
What are the three main units of measurement for pressure
Pa – pascals
atm – atmospheres
mm Hg – millimeters of mercury
How did we discover that we can measure atmospheric pressure
Evangelista Torricelli had setup a glass tube filled with mercury inverted in a
tub of mercury. If gas pressure changed, the amount of mercury in the glass
tube changed.
SATP
is standard ambient temperature and pressure. This occurs at 25 degrees
Celsius/298.15 K and the molar volume of ideal gas is 24.79 L/mol
STP
is standard temperature and pressure which is 0 degrees Celsius/273.15 K and
1 atm
Atmospheric pressure
Is a force exerted by the mass of air above a certain point
Low pressure areas have…..
less atmospheric mass above their
location
High pressure areas have…..
more atmospheric mass above their
location
what is another name for the Kelvin scale
absolute temp scale
Absolute zero or 0K is equal to
-273oC,the lowest possible temperature
The temp at which all particle motion stops
K = oC + 273
oC = K - 273
BOYLE’S LAW
as the pressure on a gas
increases, the volume of the gas decreases
proportionally, provided that the temperature
and amount of gas remain constant
CHARLES’ LAW
as the temperature of a
gas increases, the volume increases
proportionally, provided that the pressure and
amount of gas remain constant
The Combined Gas Law
Combines Charles and Boyles law
BOYLES law formula
P1V1=P2V2
P=pressure
V=volume
Charles law formula
V1/T1=V2/T2
V=volume
T=Temperature
Combined Gas law formula
P1V1/T1=P2V2/T2
What is the central rule about Charles Law
Charles’ Law only works by assuming that
pressure remains constant.
What is the central rule about Boyles Law
Boyle’s Law only works by assuming that
temperature remains constant.
