Fiszki
Chemia Fizyczna test 1
Test w formie fiszek
Ilość pytań: 14
Rozwiązywany: 3082 razy
For a perfect gas:
Cv=Cp-nR
Molar entropy does not depend on pressure
the enthalpy does not depend on pressure
Molar entropy always increases with temprerature
pV is proportional to absolute temperature
Cv=Cp-nR
the enthalpy does not depend on pressure
pV is proportional to absolute temperature
In a reversible adiabatic process:
ΔU=ΔH+Δ(pV) but only for perfect gas
ΔT=0
ΔU=w but only for perfect gas
q+w=TΔS
ΔU=w
The standard enthalpy of combustion of a compound:
doesn’t depend on temperature
is defined at standard pressure
is equal to TΔcSo+ΔcGo
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
The entropy change in an isothermal decompression of a perfect gas against constant pressure p_ext
none from above
is equal to delta(pV)/T
is equal to (C_v razy delta T)/T
is equal to zero
is equal to -delta(pV)/T
In first order phase transition:
Entropy shows a discontinuity
thermal expresion coefficient shows a discontinuity
The heat capacity shows a discontinuity
The transition entropy is delta H=T delta trans S
Entropy changes in continous way
Entropy shows a discontinuity
thermal expresion coefficient shows a discontinuity
The heat capacity shows a discontinuity
The chemical potential μi:
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
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
the enthopy of mixing:
is equal to Rlnx in system (henry's law)
is equal to -RTlnx in system (raoult's law)
is 0 for perfect gases
is equal to -Rlnx in system (raoult's law)
is equal to RTlnx in system (henry's law)
is equal to -Rlnx in system (raoult's law)
The thermodynamic equilibrium constant K:
has a temperature dependence given by the Van’t Hoff law
does not depend on the total volume of the reaction mixture
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
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:
sulphur vapor in equilibrium with orthorombic sulphur and monochromic sulphur 0
A two-compontnt system with two phases 2
A three-component system with 3 phases if temperature and pressure are fixed 0
ice in water at 1atm 0
For the concentration cell Ag|Ag+(c1)||Ag+(c2)|Ag
ΔrS⊕ > 0 for c2>c1
ΔrG=0
ΔrG=0
Emf is equal to zero for c2=c1
emf is positive if c2>c1
The mobility of H+ ions in sulphuric acid solutions:
increases with temperature
decreases with the acid concentration
decreases with temperature
is equal to 2tH+ ΛH2SO4
increases with temperature
decreases with the acid concentration
The rate of reaction 2A+B->3C is equal to:
2 d[A]/dt + d[B]/dt
k[C]^3
-k[C]^3
1/3d[C]/dt
3 d[C] /dt
In second-order reaction (nie pamiętam równania)
t ½ jest odwrotnie proporcjonalny do [A]
t ½ nie zależy od temperatury
zależy od [A]^2
t ½ jest odwrotnie proporcjonalny do [A]
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]
the steady-state approx. can be used for [C]
the steady-state approx. cannot be used for [B]
