Fiszki
Chemia Fizyczna test 1
Test w formie fiszek
Ilość pytań: 14
Rozwiązywany: 2333 razy
For a perfect gas:
Cv=Cp-nR
pV is proportional to absolute temperature
Molar entropy always increases with temprerature
Molar entropy does not depend on pressure
the enthalpy does not depend on pressure
Cv=Cp-nR
pV is proportional to absolute temperature
the enthalpy does not depend on pressure
In a reversible adiabatic process:
q+w=TΔS
ΔT=0
ΔU=w but only for perfect gas
ΔU=ΔH+Δ(pV) but only for perfect gas
ΔU=w
ΔU=w
The standard enthalpy of combustion of a compound:
doesn’t depend on temperature
is equal to TΔcSo+ΔcGo
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
is equal to TΔcSo+ΔcGo
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 zero
none from above
is equal to delta(pV)/T
is equal to (C_v razy delta T)/T
none from above
In first order phase transition:
The heat capacity shows a discontinuity
Entropy shows a discontinuity
thermal expresion coefficient shows a discontinuity
The transition entropy is delta H=T delta trans S
Entropy changes in continous way
The heat capacity shows a discontinuity
Entropy shows a discontinuity
thermal expresion coefficient shows a discontinuity
The chemical potential μi:
can be defined as (dG/dξ)T
at the triple point of a substance is equal for solid, liquid and vapor
doesn’t depend on pressure
has a minimum at the critical point
always increases with temperature
at the triple point of a substance is equal for solid, liquid and vapor
the enthopy of mixing:
is equal to -RTlnx in system (raoult's law)
is equal to -Rlnx in system (raoult's law)
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 -Rlnx in system (raoult's law)
The thermodynamic equilibrium constant K:
depends on the partial pressures in the reaction mixture
has a temperature dependence given by the Van’t Hoff law
does not depend on the total volume of the reaction mixture
does not depend on temperature
depends on the molar fractions of reactants and products in the mixture
has a temperature dependence given by the Van’t Hoff law
does not depend on the total volume of the reaction mixture
How many degrees of freedom would have:
For the concentration cell Ag|Ag+(c1)||Ag+(c2)|Ag
emf is positive if c2>c1
ΔrG=0
ΔrS⊕ > 0 for c2>c1
Emf is equal to zero for c2=c1
ΔrG=0
emf is positive if c2>c1
The mobility of H+ ions in sulphuric acid solutions:
is equal to 2tH+ ΛH2SO4
increases with temperature
decreases with the acid concentration
decreases with temperature
increases with temperature
decreases with the acid concentration
The rate of reaction 2A+B->3C is equal to:
1/3d[C]/dt
3 d[C] /dt
2 d[A]/dt + d[B]/dt
-k[C]^3
k[C]^3
1/3d[C]/dt
In second-order reaction (nie pamiętam równania)
zależy od [A]^2
t ½ nie zależy od temperatury
t ½ jest odwrotnie proporcjonalny do [A]
t ½ jest odwrotnie proporcjonalny do [A]
In reactions A+B---(k1)--->C 2C---(k2)--->D k2>>k1 Therefore:
[D] =~ (k2)/(2k1) * [C]
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]
the steady-state approx. can be used for [C]
the steady-state approx. cannot be used for [B]