18 Questions
What is the condition for chemical equilibrium?
Rates of forward reaction equal rates of reverse reaction
What does the equilibrium expression represent?
Concentrations of product and reactant in a reaction
What does the equilibrium constant, K, predict?
Extent of established chemical reaction
What is a characteristic of the equilibrium constant, K?
Dimensionless quantity
Which factor determines the direction of the net reaction in a given set of initial concentrations?
Equilibrium constant, K
What does Le Châtelier's Principle help predict in a system at equilibrium?
The effect of disturbances on an equilibrium system
According to the Debye-Hückel equation, how does the activity coefficient of an ion change with increasing ionic strength?
The activity coefficient decreases
How does the charge of an ion affect the departure of its activity coefficient from unity?
The departure from unity increases with increasing charge
What is the relationship between ion size and activity effects?
Activity effects increase with decreasing ion size
Which of the following equilibria is NOT affected by the ionic strength of the solution?
Redox equilibria
If the activity coefficient of Ca2+ is found using the Debye-Hückel equation, what parameter is NOT needed for the calculation?
The concentration of Ca2+
How does Le Châtelier's principle apply to the effect of ionic strength on chemical reactions?
Increasing ionic strength shifts the equilibrium towards the products
What is the effect of adding a reactant to a homogeneous equilibrium system?
The equilibrium shifts to the right
What type of equilibrium is represented by the reaction CaCO3(s) + H2O(l) + CO2(aq) ⇄ Ca2+(aq) + 2HCO3-(aq)?
Heterogeneous equilibrium
Which of the following statements about Le Châtelier's principle is correct?
The system adjusts to partially offset the stress applied to the system
Which of the following is not a form of equilibrium?
Temperature equilibrium
What happens to a heterogeneous equilibrium system when the temperature is decreased?
The equilibrium shifts to the left
What is the effect of increasing pressure on a system where the number of gas molecules on the reactant side is greater than the number of gas molecules on the product side?
The equilibrium shifts to the right
Test your knowledge on the criteria for chemical equilibrium such as rates of forward and reverse reactions being equal, and constant concentrations of products and reactants. Also, assess your understanding of equilibrium expression and its calculation based on product and reactant concentrations.
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