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by BlastRoom
Practice recognizing dynamic equilibrium and what stays constant in closed systems.
#chemistry
20 questions
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A sealed flask contains N2O4(g) ⇌ 2NO2(g). Once the mixture is at equilibrium, which statement is true?
For H2(g) + I2(g) ⇌ 2HI(g), what does dynamic mean in dynamic equilibrium?
A reversible reaction reaches equilibrium in a closed vessel. Which quantity is the same for the forward and reverse processes?
For N2O4(g) ⇌ 2NO2(g) at a fixed temperature, which equilibrium expression has a constant value K?
When a closed reaction mixture first reaches equilibrium, what stops changing even though particles keep colliding and reacting?
A closed flask has A ⇌ B. At 4, 6, 8, and 10 min, [A] stays 0.40 M and [B] stays 0.60 M. What conclusion fits the data?
In a reversible reaction, the measured forward rate is 1.8 × 10-3 M/s and the reverse rate is 1.8 × 10-3 M/s. What does this indicate?
A sealed NO2/N2O4 mixture darkens for several minutes, then its color remains unchanged. What is the best interpretation?
A reaction A ⇌ 2B is monitored in a closed container. After 12 min, both [A] and [B] level off and stay unchanged. Which statement is supported?
During a trial, [CO], [Cl2], and [COCl2] change at first, then remain fixed while the flask stays sealed. What state has the system reached?
At equilibrium, a mixture contains 0.90 M product and 0.10 M reactant. Which statement is correct?
A classmate says, “Equilibrium means the flask has half reactants and half products.” Which correction is best?
A sealed flask at a fixed temperature starts with only NH3(g). The reaction is N2(g) + 3H2(g) ⇌ 2NH3(g). What happens over time?
For A ⇌ B at equilibrium, [A] = 0.20 M and [B] = 0.80 M. What is the value of K = [B]/[A]?
A reaction starts with only reactants in a sealed flask. How do the forward and reverse rates change until equilibrium is reached?
For 2SO2(g) + O2(g) ⇌ 2SO3(g), the system is at equilibrium. Which statement is NOT required?
Liquid water and water vapor are sealed in a flask at constant temperature. The water level stops changing. What explains this?
Solid iodine and purple iodine vapor are sealed in a tube. After a while, the vapor color stays the same. What is happening?
A closed beaker contains saturated NaCl(aq) with undissolved crystals. The amount of solid stays constant. Which statement explains the observation?
In a sealed soda bottle, CO2(aq) ⇌ CO2(g) and the gas pressure becomes steady. What does the steady pressure indicate?
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30 questions
