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Fiszki
Chemia Fizyczna test 1
Test w formie fiszek
Ilość pytań: 14 Rozwiązywany: 2720 razy
For a perfect gas:
Molar entropy does not depend on pressure
the enthalpy does not depend on pressure
pV is proportional to absolute temperature
Molar entropy always increases with temprerature
Cv=Cp-nR
In a reversible adiabatic process:
ΔU=w
ΔT=0
ΔU=w but only for perfect gas
q+w=TΔS
ΔU=ΔH+Δ(pV) but only for perfect gas
The standard enthalpy of combustion of a compound:
is equal to TΔcSo+ΔcGo
doesn’t depend on temperature
is the the heat effect of reaction of combustion of 1 mole of a compound in air at standard pressure
is defined at standard pressure
The entropy change in an isothermal decompression of a perfect gas against constant pressure p_ext
is equal to -delta(pV)/T
is equal to (C_v razy delta T)/T
is equal to delta(pV)/T
is equal to zero
none from above
In first order phase transition:
The transition entropy is delta H=T delta trans S
Entropy changes in continous way
thermal expresion coefficient shows a discontinuity
Entropy shows a discontinuity
The heat capacity shows a discontinuity
The chemical potential μi:
doesn’t depend on pressure
can be defined as (dG/dξ)T
always increases with temperature
at the triple point of a substance is equal for solid, liquid and vapor
has a minimum at the critical point
the enthopy of mixing:
is equal to RTlnx in system (henry's law)
is equal to Rlnx in system (henry's law)
is 0 for perfect gases
is equal to -RTlnx in system (raoult's law)
is equal to -Rlnx in system (raoult's law)
The thermodynamic equilibrium constant K:
does not depend on temperature
does not depend on the total volume of the reaction mixture
depends on the partial pressures in the reaction mixture
has a temperature dependence given by the Van’t Hoff law
depends on the molar fractions of reactants and products in the mixture
How many degrees of freedom would have:
For the concentration cell Ag|Ag+(c1)||Ag+(c2)|Ag
ΔrG=0
emf is positive if c2>c1
ΔrG=0
ΔrS⊕ > 0 for c2>c1
Emf is equal to zero for c2=c1
The mobility of H+ ions in sulphuric acid solutions:
is equal to 2tH+ ΛH2SO4
increases with temperature
decreases with temperature
decreases with the acid concentration
The rate of reaction 2A+B->3C is equal to:
-k[C]^3
k[C]^3
2 d[A]/dt + d[B]/dt
1/3d[C]/dt
3 d[C] /dt
In second-order reaction (nie pamiętam równania)
t ½ jest odwrotnie proporcjonalny do [A]
zależy od [A]^2
t ½ nie zależy od temperatury
In reactions A+B---(k1)--->C 2C---(k2)--->D k2>>k1 Therefore:
rate of formation of [D] is approx. first order in [A]
the steady-state approx. can be used for [C]
[D] =~ (k2)/(2k1) * [C]
the steady-state approx. cannot be used for [B]
d[D]/dt =~ (k1k2)/(k1+k2) * [A][B]
Cześć!
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