Question

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which does not remain constant when a system is at dynamic equilibrium?
○ pressure
○ molecular reactions
○ temperature
○ concentration
○ ph
question 4 (1 point)
which of these is not an example of heterogeneous equilibrium?
○ h₂o(l) ↔ h₂o(g)
○ c(s) + co₂(g) ↔ co₂(g)
○ n₂o₄(g) ↔ 2no₂(g)
○ c₂h₅oh(l) ↔ c₂h₅oh(g)
○ caco₃(s) ↔ cao(s) + co₂(g)
question 5 (1 point)
in the equilibrium constant expression below, what do the exponents represent?
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Explanation:

• For the first question: In a dynamic equilibrium, pressure, temperature, concentration, and pH remain constant. Molecular reactions are ongoing (forward and reverse reactions occur at the same rate), but they are not a quantity that "remains constant" in the sense of a measurable property like the others.
• For the second question: Heterogeneous equilibrium involves substances in different phases. In \(N_2O_4(g)

ightleftharpoons2NO_2(g)\), all substances are in the gas phase. While in \(H_2O(l)
ightleftharpoons H_2O(g)\) (liquid - gas), \(C(s)+CO_2(g)
ightleftharpoons CO_2(g)\) (solid - gas), \(C_2H_5OH(l)
ightleftharpoons C_2H_5OH(g)\) (liquid - gas), \(CaCO_3(s)
ightleftharpoons CaO(s)+CO_2(g)\) (solid - solid - gas) there are different phases.

Answer:

• First question: molecular reactions
• Second question: \(N_2O_4(g)

ightleftharpoons2NO_2(g)\)