Podsumowanie
Chemia Fizyczna test 1
Podsumowanie
Chemia Fizyczna test 1
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Pytanie 1
For a perfect gas:
Cv=Cp-nR
the enthalpy does not depend on pressure
pV is proportional to absolute temperature
Molar entropy always increases with temprerature
Molar entropy does not depend on pressure
Pytanie 2
In a reversible adiabatic process:
ΔU=ΔH+Δ(pV) but only for perfect gas
ΔU=w
q+w=TΔS
ΔU=w but only for perfect gas
ΔT=0
Pytanie 3
The standard enthalpy of combustion of a compound:
is defined at standard pressure
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 equal to TΔcSo+ΔcGo
Pytanie 4
The entropy change in an isothermal decompression of a perfect gas against constant pressure p_ext
is equal to zero
is equal to delta(pV)/T
is equal to -delta(pV)/T
none from above
is equal to (C_v razy delta T)/T
Pytanie 5
In first order phase transition:
thermal expresion coefficient shows a discontinuity
Entropy shows a discontinuity
The transition entropy is delta H=T delta trans S
Entropy changes in continous way
The heat capacity shows a discontinuity
Pytanie 6
The chemical potential μi:
always increases with temperature
can be defined as (dG/dξ)T
doesn’t depend on pressure
at the triple point of a substance is equal for solid, liquid and vapor
has a minimum at the critical point
Pytanie 7
the enthopy of mixing:
is equal to Rlnx in system (henry's law)
is equal to RTlnx in system (henry's law)
is 0 for perfect gases
is equal to -Rlnx in system (raoult's law)
is equal to -RTlnx in system (raoult's law)
Pytanie 8
The thermodynamic equilibrium constant K:
does not depend on the total volume of the reaction mixture
does not depend on temperature
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
Pytanie 9
How many degrees of freedom would have:
Pytanie 10
For the concentration cell Ag|Ag+(c1)||Ag+(c2)|Ag
ΔrS⊕ > 0 for c2>c1
Emf is equal to zero for c2=c1
ΔrG=0
ΔrG=0
emf is positive if c2>c1
Pytanie 11
The mobility of H+ ions in sulphuric acid solutions:
is equal to 2tH+ ΛH2SO4
decreases with temperature
decreases with the acid concentration
increases with temperature
Pytanie 12
The rate of reaction 2A+B->3C is equal to:
-k[C]^3
2 d[A]/dt + d[B]/dt
3 d[C] /dt
k[C]^3
1/3d[C]/dt
Pytanie 13
In second-order reaction (nie pamiętam równania)
t ½ nie zależy od temperatury
t ½ jest odwrotnie proporcjonalny do [A]
zależy od [A]^2
Pytanie 14
In reactions A+B---(k1)--->C 2C---(k2)--->D k2>>k1 Therefore:
the steady-state approx. cannot be used for [B]
[D] =~ (k2)/(2k1) * [C]
d[D]/dt =~ (k1k2)/(k1+k2) * [A][B]
the steady-state approx. can be used for [C]
rate of formation of [D] is approx. first order in [A]