Physical Chemistry

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Q. What happens to the reaction rate if the temperature is increased by 20°C for most reactions?
  • A. Rate doubles
  • B. Rate quadruples
  • C. Rate decreases
  • D. Rate remains the same
Q. What happens to the vapor pressure of a liquid as temperature increases?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
Q. What happens to the volume of a gas when it is compressed at constant temperature?
  • A. Volume increases
  • B. Volume decreases
  • C. Volume remains the same
  • D. Volume fluctuates
Q. What happens to the volume of a gas when the pressure is doubled at constant temperature?
  • A. Volume doubles
  • B. Volume halves
  • C. Volume remains constant
  • D. Volume quadruples
Q. What happens to the volume of a gas when the temperature increases at constant pressure?
  • A. Volume decreases
  • B. Volume increases
  • C. Volume remains constant
  • D. Volume fluctuates
Q. What happens to the volume of a gas when the temperature is increased at constant pressure?
  • A. It decreases
  • B. It remains the same
  • C. It increases
  • D. It becomes zero
Q. What is Faraday's law of electrolysis?
  • A. Mass is conserved
  • B. Charge is conserved
  • C. Current is proportional to voltage
  • D. The amount of substance deposited is proportional to the charge passed
Q. What is Le Chatelier's principle?
  • A. A system at equilibrium will shift to counteract changes.
  • B. The rate of a reaction is proportional to the concentration of reactants.
  • C. Energy is conserved in chemical reactions.
  • D. The entropy of a system always increases.
Q. What is the bond angle in a water (H2O) molecule?
  • A. 90 degrees
  • B. 104.5 degrees
  • C. 120 degrees
  • D. 180 degrees
Q. What is the bond order of a molecule with 10 electrons in a molecular orbital diagram showing 5 bonding and 5 antibonding electrons?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Q. What is the bond order of a molecule with 10 electrons in a molecular orbital diagram?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Q. What is the bond order of a molecule with 10 electrons in bonding orbitals and 4 electrons in antibonding orbitals?
  • A. 1
  • B. 2
  • C. 3
  • D. 0
Q. What is the bond order of a molecule with 3 bonding electrons and 1 antibonding electron?
  • A. 0.5
  • B. 1
  • C. 1.5
  • D. 2
Q. What is the bond order of O2 if it has 12 electrons in bonding orbitals and 4 in antibonding orbitals?
  • A. 2
  • B. 3
  • C. 1
  • D. 0
Q. What is the bond order of the molecule N2?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. What is the bond order of the molecule O2?
  • A. 1
  • B. 2
  • C. 3
  • D. 0
Q. What is the bond order of the O2 molecule?
  • A. 1
  • B. 2
  • C. 3
  • D. 0
Q. What is the change in enthalpy (ΔH) for an endothermic reaction?
  • A. ΔH < 0
  • B. ΔH = 0
  • C. ΔH > 0
  • D. ΔH = -RT
Q. What is the change in enthalpy (ΔH) for an exothermic reaction?
  • A. ΔH > 0
  • B. ΔH < 0
  • C. ΔH = 0
  • D. ΔH is undefined
Q. What is the change in enthalpy (ΔH) for the reaction: 2H2(g) + O2(g) → 2H2O(g) if the bond enthalpies are: H-H = 436 kJ/mol, O=O = 498 kJ/mol, H-O = 463 kJ/mol?
  • A. −484 kJ
  • B. −572 kJ
  • C. −572 kJ
  • D. −484 kJ
Q. What is the change in enthalpy (ΔH) for the reaction: H2(g) + 1/2 O2(g) → H2O(l) if the standard enthalpy of formation of H2O(l) is -285.83 kJ/mol?
  • A. -285.83 kJ/mol
  • B. 285.83 kJ/mol
  • C. 0 kJ/mol
  • D. 571.66 kJ/mol
Q. What is the change in enthalpy (ΔH) for the reaction: H2(g) + 1/2 O2(g) → H2O(l) if the standard enthalpy of formation of H2O(l) is -285.8 kJ/mol?
  • A. -285.8 kJ/mol
  • B. 285.8 kJ/mol
  • C. 0 kJ/mol
  • D. 571.6 kJ/mol
Q. What is the change in enthalpy for the reaction at constant pressure?
  • A. It is equal to the heat absorbed or released.
  • B. It is equal to the work done on the system.
  • C. It is always negative.
  • D. It is independent of the path taken.
Q. What is the critical point of a substance?
  • A. The temperature at which a substance can exist as a solid
  • B. The temperature and pressure at which gas and liquid phases are indistinguishable
  • C. The point at which a substance boils
  • D. The temperature at which a substance freezes
Q. What is the effect of a catalyst on a system at equilibrium?
  • A. Shifts the equilibrium position
  • B. Increases the rate of reaction
  • C. Decreases the equilibrium constant
  • D. Has no effect on the reaction
Q. What is the effect of a catalyst on the activation energy of a reaction?
  • A. Increases activation energy
  • B. Decreases activation energy
  • C. Has no effect on activation energy
  • D. Changes the reaction mechanism
Q. What is the effect of a catalyst on the enthalpy change of a reaction?
  • A. Increases the enthalpy change
  • B. Decreases the enthalpy change
  • C. Has no effect on the enthalpy change
  • D. Reverses the enthalpy change
Q. What is the effect of a higher concentration of reactants on the rate of a reaction?
  • A. Rate decreases
  • B. Rate increases
  • C. Rate remains constant
  • D. Rate becomes zero
Q. What is the effect of adding a catalyst to a reaction at equilibrium?
  • A. Shifts the equilibrium to the right
  • B. Shifts the equilibrium to the left
  • C. No effect on equilibrium position
  • D. Increases the concentration of products
Q. What is the effect of adding a strong acid to a reaction at equilibrium involving a weak base?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases reaction rate
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