Physical Chemistry

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Q. In a closed system, if 100 J of heat is added to a gas and it does 40 J of work, what is the change in internal energy (ΔU) according to the first law of thermodynamics?
  • A. 60 J
  • B. 40 J
  • C. 100 J
  • D. 140 J
Q. In a closed system, if the internal energy increases, what can be said about the work done on the system?
  • A. Work is done by the system.
  • B. Work is done on the system.
  • C. No work is done.
  • D. Work is irrelevant.
Q. In a closed system, if the internal energy of the system increases, what can be said about the enthalpy?
  • A. Enthalpy decreases
  • B. Enthalpy increases
  • C. Enthalpy remains constant
  • D. Enthalpy is independent of internal energy
Q. In a closed system, if the volume of a gas is halved while the temperature remains constant, what happens to the pressure?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In a closed system, what happens to the pressure of a gas if its volume is halved at constant temperature?
  • A. Pressure doubles
  • B. Pressure halves
  • C. Pressure remains the same
  • D. Pressure quadruples
Q. In a closed system, what happens to the total pressure when the volume is decreased at constant temperature?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Fluctuates
Q. In a concentration cell with Ag⁺ at 0.1 M and Ag⁺ at 1 M, what is the cell potential at 25°C?
  • A. 0.059 V
  • B. 0.118 V
  • C. 0.177 V
  • D. 0.236 V
Q. In a concentration cell, if the concentration of the anode is 0.1 M and the cathode is 1.0 M, what is the cell potential at 25°C?
  • A. 0.059 V
  • B. 0.118 V
  • C. 0.059 log(10)
  • D. 0.118 log(10)
Q. In a concentration cell, if the concentration of the anode is 0.1 M and the cathode is 1 M, what is the cell potential at 25°C?
  • A. 0.059 V
  • B. 0.118 V
  • C. 0.059 log(10)
  • D. 0.118 log(10)
Q. In a concentration cell, the cell potential is dependent on:
  • A. Temperature only
  • B. Concentration differences
  • C. Electrode material
  • D. Surface area of electrodes
Q. In a concentration cell, the cell potential is generated due to:
  • A. Different temperatures
  • B. Different concentrations
  • C. Different pressures
  • D. Different electrode materials
Q. In a constant pressure process, how is the work done by the system related to the change in enthalpy?
  • A. W = ΔH
  • B. W = -ΔH
  • C. W = ΔH + PΔV
  • D. W = ΔH - PΔV
Q. In a constant pressure process, how is the work done calculated?
  • A. W = PΔV
  • B. W = ΔH
  • C. W = ΔU
  • D. W = Q + ΔH
Q. In a constant pressure process, the work done by the system is given by which equation?
  • A. W = PΔV
  • B. W = ΔH
  • C. W = ΔU
  • D. W = Q + ΔH
Q. In a Daniell cell, what is the role of the salt bridge?
  • A. To provide a pathway for electrons
  • B. To maintain charge neutrality
  • C. To increase the cell potential
  • D. To facilitate ion exchange
Q. In a Daniell cell, which electrode is the anode?
  • A. Copper electrode
  • B. Zinc electrode
  • C. Silver electrode
  • D. Lead electrode
Q. In a Daniell cell, which species is reduced?
  • A. Zn
  • B. Cu²⁺
  • C. Zn²⁺
  • D. Cu
Q. In a first-order reaction, if the half-life is 10 minutes, what is the rate constant?
  • A. 0.0693 min^-1
  • B. 0.1 min^-1
  • C. 0.693 min^-1
  • D. 0.5 min^-1
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the concentration after 30 minutes if the initial concentration is 1 M?
  • A. 0.125 M
  • B. 0.5 M
  • C. 0.75 M
  • D. 0.25 M
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  • A. 10 minutes
  • B. 20 minutes
  • C. 5 minutes
  • D. 15 minutes
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the concentration is doubled?
  • A. 10 minutes
  • B. 20 minutes
  • C. 5 minutes
  • D. It cannot be determined
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life after doubling the temperature?
  • A. 5 minutes
  • B. 10 minutes
  • C. 20 minutes
  • D. It cannot be determined
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life after the concentration is halved?
  • A. 5 minutes
  • B. 10 minutes
  • C. 15 minutes
  • D. 20 minutes
Q. In a galvanic cell, if the anode reaction is Zn → Zn²⁺ + 2e⁻, what is the half-reaction at the cathode if Cu²⁺ is reduced?
  • A. Cu + 2e⁻ → Cu²⁺
  • B. Cu²⁺ + 2e⁻ → Cu
  • C. Cu²⁺ → Cu + 2e⁻
  • D. Cu → Cu²⁺ + 2e⁻
Q. In a galvanic cell, what is the function of the external circuit?
  • A. To provide a path for ions
  • B. To allow electron flow
  • C. To maintain temperature
  • D. To store energy
Q. In a galvanic cell, what occurs at the anode?
  • A. Reduction of the oxidizing agent.
  • B. Oxidation of the reducing agent.
  • C. Neutralization of acids.
  • D. Formation of a precipitate.
Q. In a galvanic cell, which reaction occurs at the anode?
  • A. Reduction
  • B. Oxidation
  • C. Neutralization
  • D. Hydrolysis
Q. In a molecule with a triple bond, how many sigma and pi bonds are present?
  • A. 1 sigma, 2 pi
  • B. 2 sigma, 1 pi
  • C. 3 sigma, 0 pi
  • D. 0 sigma, 3 pi
Q. In a phase diagram, what does the line between the solid and liquid phases represent?
  • A. Sublimation point
  • B. Melting point
  • C. Boiling point
  • D. Triple point
Q. In a reaction A → B, if the rate of formation of B is 0.5 M/s, what is the rate of disappearance of A?
  • A. 0.5 M/s
  • B. 1.0 M/s
  • C. 0.25 M/s
  • D. 0.75 M/s
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