Week Six Flashcards
Gases
expand to occupy all the space
free to move
very weak forces
Boyles Law
volume is inversely proportional to the total pressure
P1V1=P2V2
Charles Law
volume is directly proportional to temp
V1/T1 = V2/T2
Avogadros law
gas volume is proportional to the amount of gas
ideal gas equation
PV = nRT
R
8.314
Pressure, Volume moles and temp equation
P1V1/N1T1 = P2V2/N2T2
Kinetic energy
1/2mu^2`
Average kinetic energy
3RT/2Na
t = temp
Na = avogardos constant
R = gas constant
Total amount of gas
n(molecule 1) + n(molecule 2)
Gas Density
pM/Rt
Dispersion forces
are the attractions between the negatively charged electron cloud of one molecule and the positively charged nuclei of neighbouring molecules
Dipole induced dipole forces
stornger than dispersion forces
molecule with permenant dipole induces a dipole in neighbouring molecule
dipole dipole forces
attractions between negatively charged end of polar molecules and the positviely charged end of neighbouring polar molecule
reactive metal + acid
hydrogen gas and metal salt
net ionic equation
only shows the ions which are in reaction not including spectator ions
redox reaction
oxidation/ reduction reaction
half equations
individual equations of the oxidised and reduced parts
Reducing agent
species that reduces the other, is being oxidised
Oxidising agent
oxidises the other species, is reduced
The activity series
ease of oxidation increases up the table
1 pascal
1N/m2
standard atmospheric pressure
760mmHg
Gay Lussac law
pressure is directly proportional to temp
p1/T1 = P2/T2
Daltons law of partial pressure
for unpure gases
Ptotal
P1 + P2
Ptotal equation
RT/V (n1+n2)
X1
(n1RT/v)/ (n1+n2)RT/V
using X1 to get total
P1 = X1 x Ptotal
Kinetic theory of Gases
physical properties of gases can be explained in terms of motion of indivual particles
deviation from ideal behaviour
when pressure is increased or gas is cooled intermolecular forces become significant enough to affect the motion of the molecules and gas wont behave ideally
Van der waals equation
van der waals equation slightly lowers the gas pressure
pideal = preal + an2/V2
a = constant n = moles v = volume
R constant in Atm, L, mol and K
0.082057L
R constant in Pa, m3, mol, and K
8.314J
Unknown Molar mass
dRT/P