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