Chapter 9 Stoichemetry And 12 Gas laws Flashcards
What kind of relationships does stoichiometry deal with?
QUANTITIVE between reactants and’s products
Progression of stoichiometry formulas
Grams of A
Moles of A
Mole ratio
Moles of B
Grams of B
Stiochemetry steps
Start with either reactant
Find which is limiting
Keep left of yields arrow
Step 2
Start with limiting
What do they want in the answer?
Kinetic theory of matter is??
All particles are always in motion
Do gas particles attract or repel each other?
No
Do gases have different KE at the same temp?
No
They have the same temp
And average KE IS proportional to the Kelvin temp
Diffusion is
Spontaneous mixing of gases based on constant random motion
(Perfume down the hall)
Effusion is?
Moving of a gas through a TINY opening
Grahams law of diffusion /effusion
Light brown effing/diff graham
cracker traveling fast as waved about,
2 gasses same p&t proportional 2density
————-
Lighter gases travels faster
Two gases at same temp and pressure
Inversely proportional to square root of densities
Pressure unit
Pascal is SI unit
(P= force per unit area)
Barometer invented by and’s explain it
Toricelli
Open pan mercury tall thin tube upwards
Measure mercury as goes up the lines in the tube
mm Hg
What is atm?
Atmospheric pressure
Reminder equation on test sheet converts atm mmHg torr
101.3 kPa equals 760 torr= 760 mmHg
Boules gas law is
If pressure of fixed amount of gas increased what happens to volume?
At CONSTANT TEMP
volume of fixed amount of gas
inversely proportional to pressure
Volume decreased
Boules law (inverse) shown on graph?
Hyperbola graph
L shaped
STP EQUALS
Standard temp and pressure
When doing equations what to predict first?
Predict answer before beginning
AND’S ALWAYS USE UNITS!!!
Charles law is what??
Shown as what graph
TV LAW
volume /temp
Volume of fixed gas directly proportional to kelvin temp as long as
PRESSURE REMAINS CONSTANT
Linear
Gay - lussac law is
Gay Kelvin under pressure
Pressure of fixed mass of gas proportional to Kelvin temp if volume is constant
Linear and’s direct proportion
Daltons partial pressure law
The total pressure of a mixture of gases
Is the sum of the partial pressures exerted by each of the gases
Need for deducting water vapor pressure when collecting gas over water in lab
How do you change a formula if a gas is collected over water?
Look up in the table what the pressure of the gas is dependent on the temp and’s subtract that pressure
(water is 26.7 mmHg if degrees C)
Gay lussac law of combining volumes
When measured at same temp and pressure
Volume of reacting gasses can be expressed as ratio of small whole numbers
(Didn’t understand diatomic yet)
Avogadros law (or hypothesis)
Equal volumes of different gases
at the same temperature and pressure contain the same number of particles

Equal volumes… Equal particles 
What IS the MOLAR VOLUME AT STP?
22.4 L
STP is at 1 atm
273 K
The density of gas at STP is what?
No matter what gas the volume of one mole of gas at STP is always 22.4 L. 
If we are using the molar volume in a calculation, we must also use what?
Molar mass 
When the temp of a gas changes what really changes?
The volume/density changes a lot!
Volume is inversely, proportional to what and whos law is it
Pressure
Boyles
Volume is proportional to what and who’s law is it?
Temperature
Charles
Volume is proportional to what and who is law is it?
Particles
Avogadro
n = what in formulas
Mole of gas
If being asked for volume of a gas when all in reaction are gasses
Start with volume of gas given, multiple by ratio of gasses given in equation
250 mL H2 x (1 mL O2/2 mL H2) =
125mL O2
mmHg\atm = PRESSURE
STP=
1atm
273 K
