Pytania i odpowiedzi
kocham pwr
Zebrane pytania i odpowiedzi do zestawu.
Ilość pytań: 41
Rozwiązywany: 1117 razy
Pytanie 1
1. The Hess law
Is a consequence of H being a state function
Pytanie 2
The entropy change in an isothermal decompression of a perfect gas against vacuum:
is equal to 0
ΔS = 0
Pytanie 3
3. For an isolated system
Entropy can only increase
Pytanie 4
In a second-order phase transition
The heat capacity show a discontinuity
Entropy changes in a continuous way
Pytanie 5
The mixing entropy for a component of a mixture
Is always positive
For perfect gases is maximum at x=1⁄2
is -R ln(x) for system obeying the Raoult’s law
Pytanie 6
The mixing entropy
is -R ln(x) for systems conforming to Raoult’s law
Pytanie 7
∆_r G can be calculated as
∆_r G=∆_r G+RTlnK
ΔrG ∘ =−RTln(K)+RT∑i Viln(ai)
Pytanie 8
The thermodynamic equilibrium constant K
Does not depend on pressure
Decreases with temperature rise for exothermic reactions
does not depend on the total volume of the reaction mixture
has a temperature dependence given by the Van’t Hoff law.
can be calculated as K=exp(-∆_r G^∅ /RT)
depends on the molar fractions of reactants and products in the mixture
Pytanie 9
How many degrees of freedom would have
A two component system with three phases
1
Pytanie 10
Sulfur at the triple point
0
Pytanie 11
A Three component system with three phases if temperature is
2
Pytanie 12
Carbon dioxide sublimig at 1 atm
1
Pytanie 13
sulphur vapor in equilibrium with orthorombic sulphur and monochromic sulphur
0
Pytanie 14
A two-compontnt system with two phases
2
Pytanie 15
A three-component system with 3 phases if temperature and pressure are fixed
2
Pytanie 16
ice in water at 1atm
0
Pytanie 17
11. For a concentration cell
∆_r Go= 0
both electrodes are made of the same metal
Pytanie 18
The mobility of ions in a strong electrolyte
Decreases with concentration
Increases with temperature
Pytanie 19
The mobility of H+ ions in sulphuric acid solutions:
decreases with the acid concentration
increases with temperature
Pytanie 20
The rate of reaction 3A+B->2C is equal to
1⁄2 d[C]/dt