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Chemistry Equilibrium Easy #71
What is the state of a chemical reaction at equilibrium?
A Rate of forward reaction is greater than reverse reaction
B Rate of reverse reaction is greater than forward reaction
C Rate of forward reaction equals rate of reverse reaction
D Reaction stops completely
At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, leading to no net change in the concentration of reactants and products over time.
Chemistry Equilibrium Easy #72
Which of the following is true for a system at equilibrium?
A The concentrations of reactants and products are equal
B The concentrations of reactants and products are constant
C The reaction stops
D Only products are present
At equilibrium, the concentrations of reactants and products remain constant over time, though they are not necessarily equal. The reaction continues at equal rates in both directions.
Chemistry Equilibrium Easy #73
What does the equilibrium constant (K) represent?
A The rate of the forward reaction
B The rate of the reverse reaction
C The ratio of concentrations of products to reactants at equilibrium
D The difference between product and reactant concentrations
The equilibrium constant (K) is the ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their stoichiometric coefficients.
Chemistry Equilibrium Easy #74
For a reaction, if K > 1, it indicates that:
A Reactants are favored
B Products are favored
C Reaction is at equilibrium
D Reaction does not occur
If K > 1, the concentration of products is greater than that of reactants at equilibrium, indicating that the reaction favors the formation of products.
Chemistry Equilibrium Easy #75
Which of the following does not affect the equilibrium position of a reaction?
A Temperature
B Pressure
C Concentration
D Catalyst
A catalyst speeds up the rate of both forward and reverse reactions equally, thus it does not affect the equilibrium position; it only helps the system reach equilibrium faster.
Chemistry Equilibrium Easy #76
What happens to the equilibrium when temperature is increased for an exothermic reaction?
A Shifts to the right
B Shifts to the left
C No change
D Reaction stops
For an exothermic reaction, increasing temperature favors the reverse reaction (endothermic), shifting the equilibrium to the left to absorb the added heat.
Chemistry Equilibrium Easy #77
Le Chatelier’s principle states that:
A A system at equilibrium cannot be disturbed
B A system at equilibrium adjusts to minimize disturbances
C Equilibrium is achieved only at high pressure
D Equilibrium depends only on temperature
Le Chatelier’s principle states that if a system at equilibrium is disturbed by a change in conditions, it will adjust to counteract the disturbance and restore equilibrium.
Chemistry Equilibrium Easy #78
What is the unit of equilibrium constant (K) for a reaction with equal moles of reactants and products?
A mol/L
B L/mol
C No unit
D mol²/L²
If the number of moles of reactants and products are equal in a balanced equation, the equilibrium constant (K) has no unit since the concentration terms cancel out.
Chemistry Equilibrium Easy #79
What effect does increasing pressure have on a gaseous equilibrium reaction with more moles of reactants than products?
A Shifts to the right
B Shifts to the left
C No effect
D Reaction stops
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. If there are more moles of reactants, the equilibrium shifts to the left.
Chemistry Equilibrium Easy #80
Which of the following is a characteristic of a dynamic equilibrium?
A Reactions stop completely
B Forward and reverse reactions occur at the same rate
C Only forward reaction occurs
D Only reverse reaction occurs
Dynamic equilibrium is characterized by the forward and reverse reactions occurring at the same rate, resulting in no net change in the system.
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