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