Dynamic Equilibrium and Le Chatelier’s Principle (OCR A-Level Chemistry A): Quizzes
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10 questions from this quiz
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Practise the questions
10 questions from this quiz
What are the two key features of a system at dynamic equilibrium?
What are the two key features of a system at dynamic equilibrium?
Forward rate = reverse rate; conc. constant
According to Le Chatelier's principle, how does an equilibrium system respond to change?
According to Le Chatelier's principle, how does an equilibrium system respond to change?
It shifts to minimize the effect of change
What happens when the concentration of a reactant is increased in an equilibrium system?
What happens when the concentration of a reactant is increased in an equilibrium system?
Equilibrium shifts away from that reactant
In the chromate-dichromate equilibrium, what colour change occurs when acid is added?
In the chromate-dichromate equilibrium, what colour change occurs when acid is added?
Yellow to orange
How does increasing temperature affect an equilibrium system?
How does increasing temperature affect an equilibrium system?
Shifts in the endothermic direction
In the cobalt chloride equilibrium, what happens when the pink solution is heated?
In the cobalt chloride equilibrium, what happens when the pink solution is heated?
Turns blue as equilibrium shifts right
How does increased pressure affect a gaseous equilibrium?
How does increased pressure affect a gaseous equilibrium?
Shifts to side with fewer gas molecules
For , what happens when pressure increases?
For , what happens when pressure increases?
Brown colour fades as equilibrium shifts right
What effect does a catalyst have on the position of equilibrium?
What effect does a catalyst have on the position of equilibrium?
No change to position
Why is a compromise temperature of 350-500°C used in the Haber process?
Why is a compromise temperature of 350-500°C used in the Haber process?
Balance between yield and reaction rate