Equilibrium
What is the term for the equilibrium state of a reaction when the rate of the forward reaction equals the rate of the reverse reaction?
Chemical saturation
Dynamic equilibrium
Kinetic stability
Phase transition
In a chemical reaction at equilibrium, if the concentration of reactants is increased, what happens to the rate of the forward reaction?
It decreases.
It remains constant.
It stops completely.
It increases.
Equilibrium can only occur in ____ systems.
isolated
static
open
closed
If acetone (CH3COCH3) and dimethyl ether (CH3OCH3) have almost identical molecular masses, why does acetone have a higher boiling point?
Dimethyl ether is less polar compared to acetone.
Dimethyl ether shows stronger London dispersion forces than acetone.
Acetone displays more covalent bonding than dimethyl ether.
Acetone engages in hydrogen bonding due to the carbonyl group.
If a reversible reaction at equilibrium experiences an increase in temperature, what happens to the value of its equilibrium constant (K) if it's endothermic?
It depends on concentration changes only.
It increases.
It remains unchanged.
It decreases.
In the Haber process for synthesizing ammonia, N2(g) + 3H2(g) ⇌ 2NH3(g), what happens to the equilibrium position if the pressure is increased at constant temperature?
It remains unchanged.
It shifts towards the formation of ammonia.
It results in more nitrogen and hydrogen gas being produced.
It shifts towards the decomposition of ammonia.
Considering Le Chatelier’s Principle, which action would NOT affect Keq but would result in an increased production rate for C(s) if C(s)+D(g)<=>E(g)?
Adding more D(g).
Increasing total pressure by adding Ar(g).
Decreasing volume.
Removing some E(g).

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What happens when temperature decreases in endothermic reactions like HCOOH(l) ⇌ H+(aq) + HCOO−(aq)?
The concentration of formate ions (HCOO−) would increase because the colder temperature speeds up exothermic reactions within the equation.
There would be no change in the concentrations of either side because temperature is not contained within this equation.
The concentration of hydronium ions (H+) would decrease since less solvent is available favoring forward reactions due to colder temperatures.
The concentration of formic acid (HCOOH) would increase as less heat favours reactants in endothermic processes.
Which of the following statements about the equilibrium constant, Kc, is true?
Kc is only valid at a specific temperature for a given reaction.
Kc is always greater than 1 for an exothermic reaction.
Kc is a measure of the rate at which a reaction reaches equilibrium.
Kc is dependent on the initial concentrations of reactants and products.
When describing an equilibrium mixture, which phrase is correct?
Concentrations of reactants and products remain constant.
The chemical reaction halts completely when equilibrium is achieved.
Timescale for reaching equilibrium is always rapid.
Quantities of reactants and products are always equal.