WorksheetsOCR Chemistry A – 5.1.2 How Far?
Total questions: 15
Worksheet time: 14mins
ρP = Ptotal ×x
What is the name of x?
(a)
Xn(a)=x
For mol fraction, x,
what does the denominator, X, represent?
(a)
Xn(a)=x
What does the numerator, n(a), represent?
(a)
The sum of all the ρP is the
(a)
Liquids and solids should be omitted from K expressions in the case of (a) equilibria
Which equilibrium constants would be appropriate for this system?
A(g) + B(g) ⇌ 2C(g)
Kc
Kp
Kw
Which equilibrium constant/s would be appropriate for this system?
A(aq) ⇌ B(aq) + H2O(l) + C(s)
Kc
Kp
Kw
Which expression would be suitable for Kc of this system?
2A(aq) + B(aq) ⇌ C(s) + 2D(g)
[C][D]2[A]2[B]
[B][A]2[C][D]2
[B][A]21
[A]2[B][D]2
Which expression would be suitable for Kp of this system?
2W(aq) + X(aq) ⇌ 3Y(aq) + Z(g)
[Y]3[X][W]2
[X][W]2[Z][Y]3
[X][W]2[Y]3
[Z]
"Explain the effect of temperature change on K"
Put the statements in the correct order
The forward reaction is endothermic
The reaction shifts to the right when T is increased
More reactants are made
The numerator increases
K increases
The forward reaction is exothermic.
The temperature is decreased.
...
The value of K (a) creases
The value of K only changes with change in
P
T
V
addition of catalyst
the open/closed-ness of the system
"Explain, in terms of Kp, the effect on the position of equilibrium when the volume of the container is halved"
X ⇌ Y + Z
The total pressure is increased
The ρP of all reactants increases
the numerator increases more
more reactants are made to increase the denominator
Kp is restored
"Explain, in terms of Kc, the effect on the position of equilibrium when B is removed from the system"
A + B ⇌ C + D
the denominator decreases
Kc is restored
The [B] is decreased
more reactants are made to increase the denominator
"Explain, in terms of Kc, the effect on the position of equilibrium when a catalyst is added"
A + 2B ⇌ C + D
more C and D are made and the numerator increases, increasing K
The rates of forward and backward reactions are increased, and numerator and denominator stay the same. Kc stays the same.
More A and B are used up, and the denominator decreases, increasing K
the denominator increases more, so more products are made to increase the numerator and Kc stays the same
