Chemical Equilibrium MDCAT Quiz is the state in which the concentrations of reactants and products in a chemical reaction remain constant over time, as the rates of the forward and reverse reactions become equal. In a system at equilibrium, the reaction does not stop but continues at the same rate in both directions, meaning the overall concentrations of the involved substances no longer change. This dynamic state is crucial in understanding reversible reactions, where the products can reform the reactants, and vice versa.
The system reaches a point where the forward reaction (reactants to products) and the reverse reaction (products to reactants) occur at the same rate at equilibrium. This results in the concentrations of reactants and products remaining constant, although the reactions are still ongoing. The position of equilibrium depends on factors such as temperature, pressure, and the concentration of reactants or products.
Le Chatelier’s Principle
Le Chatelier’s Principle states that if a system at equilibrium is disturbed by changing the concentration of reactants or products, pressure, or temperature, the system will adjust to counteract the change and restore equilibrium. The principle allows us to predict how the system will react under different kinds of stresses. Thus, for example, when the concentration of one of the reactants is increased, the position of the system shifts towards the products so that the excess reactant is consumed. Changes in temperature and pressure may similarly shift the position of the equilibrium in favor of the reactants or products, depending on the nature of the reaction.
The MDCAT students have to know the topic Chemical Equilibrium to attempt various problems that come up during a chemical reaction and changes in conditions while trying to find out the resulting effect. Often, the questions of the MDCAT Quiz have the shift of equilibrium predicted, calculated the value of the equilibrium constant, and applied Le Chatelier’s principle in explaining many reactions.
MDCAT Quiz on Chemical Equilibrium
The MDCAT Quiz on Chemical Equilibrium challenges students to apply their knowledge of equilibrium principles in real-world scenarios. It may contain questions about the equilibrium constant (K), how changes in concentration or temperature affect the system, and how to use Le Chatelier’s Principle in predicting shifts in equilibrium. Taking this quiz gives students the chance to practice these concepts, helping them master equilibriums for the MDCAT exam.
Get Your Username and Password for MDCAT Tests
Sign Up Now
Free Flashcard for Chemical Equilibrium
Our Free Flashcard for Chemical Equilibrium presents a summary of key concepts from how equilibrium is established to Le Chatelier’s Principle and how to calculate equilibrium constants. Examples of common reactions at equilibrium are also given to help solidify a student’s understanding. Using these flashcards will allow students to quickly review essential concepts and be well-prepared for equilibrium-related questions in the MDCAT exam.
Chemical equilibrium is achieved when the rate of the forward reaction is __________.
Equal to the rate of the reverse reaction
The equilibrium constant for a reaction is affected by __________.
Temperature
In a chemical equilibrium, the concentration of reactants and products __________.
Remains constant
According to Le Chatelier’s principle, if the temperature of a reaction is increased, the equilibrium will shift __________.
Towards the endothermic side
The equilibrium constant (K) for a reaction is temperature dependent because __________.
The activation energy changes
The value of Kp for a gas-phase reaction is affected by __________.
Pressure and temperature
If the reaction quotient Q is greater than the equilibrium constant K, the system will shift __________.
To the left
In a reaction at equilibrium, if the concentration of products is increased, the system will shift __________.
To the left
The equilibrium constant for a reaction involving gases is usually expressed as __________.
Kp
For a reaction at equilibrium, the rate of the forward reaction is __________.
Equal to the rate of the reverse reaction
At equilibrium, the system has __________ energy.
The maximum energy
A catalyst affects chemical equilibrium by __________.
Increasing the rate of both forward and reverse reactions
If the concentration of reactants is increased, the equilibrium will shift __________.
To the right
In the expression for Kc, the concentrations of solids and liquids are __________.
Included
The equilibrium constant for a reaction is the ratio of the concentrations of __________.
Products to reactants
Le Chatelier’s principle applies to __________.
Chemical reactions only
The reaction quotient (Q) is calculated using the __________.
Current concentrations
For an exothermic reaction, increasing the temperature will shift the equilibrium __________.
Towards the reactants
The equilibrium constant K is calculated from the concentrations of __________.
Products raised to their stoichiometric coefficients
For a reaction at equilibrium, the system will __________ if more reactants are added.
Shift to the left
For a gaseous equilibrium, the volume can be changed to shift the equilibrium position if __________.
The number of gas molecules is unequal on both sides
If a system at equilibrium is disturbed by changing the pressure, the equilibrium will shift towards the side with __________.
More moles of gas
In a dynamic equilibrium, the concentrations of reactants and products are __________.
Constant but not equal
The equilibrium constant expression for a general reaction is written as the ratio of __________.
Products raised to their coefficients to reactants raised to their coefficients
When a catalyst is added to a reaction, the equilibrium position __________.
Shifts to the right
When a chemical reaction reaches equilibrium, the reaction is said to be __________.
In a dynamic state
The law of mass action states that the rate of a reaction is proportional to __________.
The concentration of reactants
If the reaction is at equilibrium and the volume of the container is decreased, the equilibrium will shift towards __________.
The side with fewer gas molecules
The equilibrium constant expression for a reaction involving gases uses the partial pressures of __________.
Reactants and products
For a reaction at equilibrium, changing the concentration of products will __________.
Shift the equilibrium to the right
Experience the real exam environment with our expertly designed collection of over 25,000 MCQs MDCAT Mock Tests.
