Physical Chemistry

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Q. In a reaction at equilibrium, what does the equilibrium constant (K) represent?
  • A. The ratio of products to reactants at equilibrium.
  • B. The rate of the forward reaction.
  • C. The change in Gibbs free energy.
  • D. The concentration of reactants only.
Q. In a reaction at equilibrium, what effect does adding an inert gas at constant volume have?
  • A. Shifts the equilibrium to the right
  • B. Shifts the equilibrium to the left
  • C. No effect on the equilibrium
  • D. Increases the reaction rate
Q. In a reaction at equilibrium, what effect does increasing the pressure have if the number of moles of gas on the reactant side is greater than that on the product side?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction rate decreases
Q. In a reaction at equilibrium, what effect does increasing the pressure have if the number of moles of gas on the reactant side is greater than on the product side?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction stops
Q. In a reaction at equilibrium, what effect does increasing the temperature have on an exothermic reaction?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. In a reaction at equilibrium, what happens if the concentration of a reactant is increased?
  • A. The equilibrium shifts to the right
  • B. The equilibrium shifts to the left
  • C. The equilibrium remains unchanged
  • D. The reaction stops
Q. In a reaction at equilibrium, what happens if the concentration of reactants is increased?
  • A. The equilibrium shifts to the right
  • B. The equilibrium shifts to the left
  • C. The equilibrium remains unchanged
  • D. The reaction stops
Q. In a reaction at equilibrium, what happens if the pressure is increased by decreasing the volume?
  • A. Shifts to the side with more moles of gas
  • B. Shifts to the side with fewer moles of gas
  • C. No effect
  • D. Reaction stops
Q. In a reaction at equilibrium, what happens if the pressure is increased for a reaction with fewer moles of gas on the product side?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. In a reaction at equilibrium, what happens if the pressure is increased?
  • A. Shifts to the side with more moles of gas
  • B. Shifts to the side with fewer moles of gas
  • C. No effect
  • D. Reaction stops
Q. In a reaction at equilibrium, what happens if the volume is increased?
  • A. Shifts to the side with more moles of gas
  • B. Shifts to the side with fewer moles of gas
  • C. No effect
  • D. Reaction stops
Q. In a reaction at equilibrium, what happens to the concentrations of reactants and products?
  • A. They remain constant
  • B. They increase
  • C. They decrease
  • D. They fluctuate
Q. In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
  • A. ΔH increases.
  • B. ΔH decreases.
  • C. ΔH remains constant.
  • D. ΔH becomes negative.
Q. In a reaction at equilibrium, what happens to the enthalpy if the temperature is increased?
  • A. Enthalpy increases for exothermic reactions
  • B. Enthalpy decreases for endothermic reactions
  • C. Enthalpy increases for endothermic reactions
  • D. Enthalpy remains unchanged
Q. In a reaction at equilibrium, what happens to the rate of the forward and reverse reactions?
  • A. Forward rate is greater
  • B. Reverse rate is greater
  • C. Both rates are equal
  • D. Rates are not related
Q. In a reaction at equilibrium, what is the effect of adding a catalyst?
  • A. Shifts the equilibrium to the right
  • B. Shifts the equilibrium to the left
  • C. No effect on the equilibrium position
  • D. Increases the concentration of products
Q. In a reaction at equilibrium, what is the effect of decreasing the volume of the container?
  • A. Shifts the equilibrium to the side with more moles of gas
  • B. Shifts the equilibrium to the side with fewer moles of gas
  • C. No effect on the equilibrium position
  • D. Increases the temperature
Q. In a reaction at equilibrium, what is the effect of decreasing the volume of the system?
  • A. Shifts the equilibrium to the side with more moles of gas
  • B. Shifts the equilibrium to the side with fewer moles of gas
  • C. No effect on the equilibrium
  • D. Increases the temperature
Q. In a reaction at equilibrium, what is the effect of increasing the pressure if the number of moles of gas is equal on both sides?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the reaction rate
Q. In a reaction mechanism, if the slow step is A + B -> C, what can be inferred about the overall rate law?
  • A. Rate = k[A][B]
  • B. Rate = k[A]^2
  • C. Rate = k[B]^2
  • D. Rate = k[C]
Q. In a reaction mechanism, if the slow step is the rate-determining step, how does it affect the overall reaction rate?
  • A. It has no effect
  • B. It increases the rate
  • C. It decreases the rate
  • D. It determines the rate
Q. In a reaction mechanism, what is an intermediate?
  • A. A reactant that is consumed in the final product
  • B. A product that is formed and then consumed
  • C. A catalyst that speeds up the reaction
  • D. A transition state of the reaction
Q. In a reaction mechanism, what is the term for the slowest step that determines the overall reaction rate?
  • A. Rate-determining step
  • B. Intermediate step
  • C. Fast step
  • D. Equilibrium step
Q. In a reaction where heat is a product, what happens if the temperature is decreased?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. In a reaction where heat is absorbed (endothermic), what happens if the temperature is decreased?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction rate decreases
Q. In a reaction where heat is absorbed (endothermic), what happens when the temperature is decreased?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Increases the reaction rate
Q. In a reaction where heat is absorbed (endothermic), what is the effect of increasing temperature?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect
  • D. Decreases reaction rate
Q. In a reaction where the enthalpy change is positive, what can be inferred about the reaction?
  • A. It is exothermic.
  • B. It is endothermic.
  • C. It is spontaneous.
  • D. It is at equilibrium.
Q. In a reaction where the rate constant doubles with a 10°C increase in temperature, what is the approximate activation energy (Ea) if R = 8.314 J/(mol·K)?
  • A. 40 kJ/mol
  • B. 80 kJ/mol
  • C. 120 kJ/mol
  • D. 160 kJ/mol
Q. In a reaction where the rate is dependent on the concentration of two reactants, what is the term for the concentration of reactants at which the reaction rate is half of its maximum?
  • A. Equilibrium concentration
  • B. Half-life concentration
  • C. Saturation concentration
  • D. Threshold concentration
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