Pytania i odpowiedzi
Chemia Fizyczna test 1
1.
For a perfect gas:
pV is proportional to absolute temperature, the enthalpy does not depend on pressure, Cv=Cp-nR
2.
In a reversible adiabatic process:
ΔU=w
3.
The standard enthalpy of combustion of a compound:
is defined at standard pressure, is equal to TΔcSo+ΔcGo
4.
The entropy change in an isothermal decompression of a perfect gas against constant pressure p_ext
none from above
5.
In first order phase transition:
The heat capacity shows a discontinuity, Entropy shows a discontinuity, thermal expresion coefficient shows a discontinuity
6.
The chemical potential μi:
at the triple point of a substance is equal for solid, liquid and vapor
7.
the enthopy of mixing:
is equal to -Rlnx in system (raoult's law)
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
How many degrees of freedom would have:
9.
sulphur vapor in equilibrium with orthorombic sulphur and monochromic sulphur
0
10.
A two-compontnt system with two phases
2
11.
A three-component system with 3 phases if temperature and pressure are fixed
0
12.
ice in water at 1atm
0
13.
For the concentration cell Ag|Ag+(c1)||Ag+(c2)|Ag
emf is positive if c2>c1
14.
The mobility of H+ ions in sulphuric acid solutions:
decreases with the acid concentration, increases with temperature
15.
The rate of reaction 2A+B->3C is equal to:
1/3d[C]/dt
16.
In second-order reaction (nie pamiętam równania)
t ½ jest odwrotnie proporcjonalny do [A]
17.
In reactions A+B---(k1)--->C 2C---(k2)--->D k2>>k1 Therefore:
the steady-state approx. can be used for [C], the steady-state approx. cannot be used for [B]