Question 1

An example of a homogeneous reversible reaction is the reaction between hydrogen and iodine.

H2 (g) + I2(g) $\leftrightarrow$ 2HI (g)

Outline the characteristics of a homogeneous chemical system that is in a state of equilibrium.

Accepted Answer

reactants and products in same phase/state;

rate of forward reaction = rate of reverse reaction;

concentrations of reactants and products remain constant /macroscopic properties remain constant;

Donot accept concentrations are equal.

Question 2

An example of a homogeneous reversible reaction is the reaction between hydrogen and iodine.

H2 (g) + I2(g) $\leftrightarrow$ 2HI (g)

Predictwhat would happen to the position of equilibrium and the value of Kc if the pressure is increased from 1 atm to 2atm

Accepted Answer

no change to position of equilibrium; no change to value of Kc;

Question 3

An example of a homogeneous reversible reaction is the reaction between hydrogen and iodine.

H2 (g) + I2(g) $\leftrightarrow$ 2HI (g)

Thereaction can be catalysed by adding platinum metal. State and explain whateffect the addition of platinum would have on the value of the equilibriumconstant.

Accepted Answer

no effect (on the value of the equilibrium constant); as it speeds up forward and reverse reaction / concentrations of reactants and products do not change / position of equilibrium does not change / no change in yield

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