Chemical equiilibrium questions | form six Chemistry

(a) (i) Define the term dynamic equilibrium
(ii) State the equilibrium law
(b) given the following system at equilibrium:
2SO₂(g) + O₂(g) 2SO₃(g) ΔH = -188.0kJmol^-1
Predict the change of the concentration of SO₃ if
(i) the pressure of the system is increased
(ii) a noble gas is added such that the pressure of the system increases but no volume changes occur
(iii) more SO₃ is added to the system
(iv) the temperature of the system is increased
(c) Consider the decomposition of phosphorous pentachloride: PCl₅(g) PCl₃(g) + Cl₂(g)
Derive an expression which relates K_c and K_p for the above equilibrium where K_c and K_p are the equilibrium constants in terms of concentration and pressure respectively.
(d) At 500^oC, the reaction between nitrogen and hydrogen to form ammonia has K_c = 8.0x10^-2 Calculate its K_p value.

Answer / Solution

UNSOLVED

Briefly explain the following phrases , giving one example for each

1. Reversible reaction
2. Heterogeneous equilibrium

Answer / Solution

UNSOLVED

1. State the equilibrium law and provide the corresponding expression.
2. List four characteristics of chemical equilibrium.
3. Write the expression for the equilibrium constant. , for the equation 

Answer / Solution

UNSOLVED

(i) Briefly explain the effect of change of pressure to a system at equilibrium.
(ii) Why does a Coca cola soda fizz out when its bottle is opened? Give a reason.

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UNSOLVED

Consider the following equilibrium:
2CrO​ ₄​ ^2- ​ (aq) + 2H​ +​ (aq) ⇌ Cr​ _2​ O​ ₇​ ^2-​ (aq) + H​ _2​ O (l)
                        Yellow                                 Orange
What would be observed when:
(i) dilute NaOH is added to the equilibrium mixture?
(ii) dilute HCl is added to the equilibrium mixture?

Answer / Solution

UNSOLVED