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MCAT Chem 3/4
MCAT Chem
49
Chemistry
Undergraduate 2
07/11/2009

Additional Chemistry Flashcards

 


 

Cards

Term
H bond
Definition
H bonded to F, O, or N
Term
Work on chemical system eqn
Definition

w=PΔV

(constant pressure)

Term
Conduction-temperature difference is proportional to
Definition
distance b/w 2 points
Term
Rate of heat flow...
Definition
doesn't change when traveling thru line of materials placed b/w hot + cold reservoirs
Term
1st Law of Thermodynamics
Definition

ΔE= q+w

 

OR: q-w=ΔE

Term
Examples of state functions (ie don't change depending on path)
Definition
U, T, P, V, H, S, G
Term
Examples of Path function (ie change according to path)
Definition
work, heat
Term
K.E. avg=
Definition
K.E. avg= 3/2 kT
Term
Enthalpy eqn
Definition

ΔH=ΔU+PΔV

 

(const. pressure, ΔU=internal E)

Term
Converting °C to °K
Definition
Add 273
Term
Heat (ΔH enthalpy) of rxn
Definition
ΔH°rxn=ΔH°f products- ΔH°f rxtnts
Term
Label Fig. 1 on pg. 1 of notebook
Definition
Term
Exothermic rxn has _ Δenthalpy
Definition
-ΔH
Term
Endothermic rxn has _ ΔH
Definition
+ΔH
Term
Entropy increases w/
Definition
#, V, T
Term
ΔS of sys. + surroundings eqn
Definition
ΔSsystem + ΔSsurroundings = ΔSuniverse≥0
Term
ΔG Gibbs free energy eqn
Definition

ΔG= ΔH-TΔS

(const. T & P rxns)

Term
ΔG from (+/-) ΔH & ΔS chart
Definition

ΔH   ΔS   ΔG

(-)   (+) → (-)

(+)   (-) → (+)

 

Term
Heat is being __ if ΔH is (+)
Definition
absorbed
Term
At Equilibrium, ΔG=
Definition
0
Term
Bond broken, E is __. Bond formed, E is __
Definition
absorbed; released
Term
nitrite
Definition
NO2-
Term
Nitrate
Definition
NO3-
Term
sulfite
Definition
SO32-
Term
Sulfate
Definition
SO42-
Term
hypochlorite
Definition
Cl0-
Term
chlorite
Definition
Cl02-
Term
chlorate
Definition
Cl03-
Term
perchlorate
Definition
Cl04-
Term
carbonate
Definition
CO32-
Term
bicarbonate
Definition
HCO3-
Term
phosphate
Definition
PO43-
Term
molarity eqn
Definition
M= mols solt/ L soln
Term
molality
Definition
m= mols solt/ kg solvent
Term
mole fraction
Definition
x = mols solt/ mols solt + solvent
Term
mass % =
Definition
mass %= mass solt/ mass soln X 100
Term
ppm=
Definition
ppm = mass solt/ mass soln X106
Term
D =
Definition
m/V=kg/L
Term
specific gravity =
Definition
D substance/ D H2O
Term
Raoult's law (vapor press.) for nonvolatile solt
Definition

Pv = xa Pa

 

(xa= mole fraction of liqd a; Pa= vapor press. of liqd a)

Term
vapor press. eqn for volatile solt addition
Definition
Pv = xa Pa + xb Pb
Term
stronger bonds form in a soln when heat is...
Definition
given off (exothermic)
Term
High ksp= __soluble
Definition
more
Term
T increase, gas __ soluble
Definition
less (e.g. soda can); nt: opposite for salts
Term
H2O boils at ___ °C & ___ torr
Definition
100°C & 760 torr
Term
Volatile solt addition. If exothermic, Pv deviates...
Definition
negatively from Raoult's law.
Term
Nonvolatile solt addition. Pv...
Definition
decreases (b/c takes up space of surface molecules)
Term
Element in standard state @ 25 °C. ΔH=?
Definition
0
Term
Heat engine is more efficient if temp of reservoirs are...
Definition
more different
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