Gibbs Free Energy

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Q. What does a negative ΔG indicate about a chemical reaction?
  • A. The reaction is at equilibrium.
  • B. The reaction is non-spontaneous.
  • C. The reaction is spontaneous.
  • D. The reaction requires energy input.
Q. What does a positive ΔG indicate about a reaction?
  • A. The reaction is spontaneous.
  • B. The reaction is non-spontaneous.
  • C. The reaction is at equilibrium.
  • D. The reaction releases energy.
Q. What does a positive ΔG indicate about the spontaneity of a reaction?
  • A. The reaction is spontaneous.
  • B. The reaction is non-spontaneous.
  • C. The reaction is at equilibrium.
  • D. The reaction is exothermic.
Q. What does a positive ΔS indicate about a system?
  • A. The system is becoming more ordered.
  • B. The system is becoming more disordered.
  • C. The reaction is non-spontaneous.
  • D. The reaction is at equilibrium.
Q. What does a ΔG value of zero indicate about a reaction?
  • A. The reaction is spontaneous.
  • B. The reaction is at equilibrium.
  • C. The reaction is non-spontaneous.
  • D. The reaction is exothermic.
Q. What effect does increasing temperature have on the Gibbs Free Energy of an endothermic reaction?
  • A. ΔG increases.
  • B. ΔG decreases.
  • C. ΔG remains constant.
  • D. ΔG becomes zero.
Q. What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
  • A. It makes ΔG more negative.
  • B. It makes ΔG less negative.
  • C. It has no effect on ΔG.
  • D. It makes ΔG positive.
Q. What is the effect of increasing temperature on a reaction with ΔH > 0 and ΔS < 0?
  • A. Increases spontaneity
  • B. Decreases spontaneity
  • C. No effect on spontaneity
  • D. Makes it spontaneous at high temperatures
Q. What is the Gibbs Free Energy change (ΔG) at equilibrium?
  • A. ΔG < 0
  • B. ΔG = 0
  • C. ΔG > 0
  • D. ΔG = ΔH - TΔS
Q. What is the relationship between Gibbs Free Energy and spontaneity?
  • A. ΔG < 0 indicates non-spontaneous reactions.
  • B. ΔG = 0 indicates spontaneous reactions.
  • C. ΔG > 0 indicates spontaneous reactions.
  • D. ΔG < 0 indicates spontaneous reactions.
Q. What is the relationship between Gibbs Free Energy and the equilibrium constant (K)?
  • A. ΔG = -RT ln(K)
  • B. ΔG = RT ln(K)
  • C. ΔG = KRT
  • D. ΔG = K - RT
Q. What is the relationship between ΔG and equilibrium constant K?
  • A. ΔG = -RT ln K
  • B. ΔG = RT ln K
  • C. ΔG = KRT
  • D. ΔG = K/R
Q. What is the relationship between ΔG and the equilibrium constant (K)?
  • A. ΔG = -RT ln(K)
  • B. ΔG = RT ln(K)
  • C. ΔG = KRT
  • D. ΔG = K - RT
Q. What is the significance of a negative ΔG in biochemical reactions?
  • A. It indicates the reaction is reversible.
  • B. It indicates the reaction is spontaneous.
  • C. It indicates the reaction is at equilibrium.
  • D. It indicates the reaction requires energy.
Q. What is the significance of the Gibbs Free Energy in chemical thermodynamics?
  • A. It predicts the direction of a reaction.
  • B. It measures the heat of reaction.
  • C. It indicates the concentration of reactants.
  • D. It determines the rate of reaction.
Q. What is the significance of the Gibbs Free Energy of formation (ΔGf°)?
  • A. It indicates the stability of a compound.
  • B. It is the energy required to form a compound from its elements.
  • C. It is always negative.
  • D. It is temperature dependent.
Q. What is the standard Gibbs Free Energy change (ΔG°) for a reaction at standard conditions?
  • A. Always zero
  • B. Depends on the reaction
  • C. Is a constant value
  • D. Is always positive
Q. Which factor does NOT affect the Gibbs Free Energy of a reaction?
  • A. Temperature
  • B. Pressure
  • C. Concentration of reactants
  • D. Nature of the solvent
Q. Which factor does NOT affect the Gibbs Free Energy of a system?
  • A. Temperature
  • B. Pressure
  • C. Concentration of reactants
  • D. Nature of the solvent
Q. Which of the following conditions will favor the spontaneity of a reaction?
  • A. High ΔH and low ΔS
  • B. Low ΔH and high ΔS
  • C. High ΔH and high ΔS
  • D. Low ΔH and low ΔS
Q. Which of the following conditions will lead to a decrease in Gibbs Free Energy?
  • A. Increasing temperature for an exothermic reaction.
  • B. Decreasing entropy.
  • C. Increasing pressure for a gas-phase reaction.
  • D. Increasing ΔH.
Q. Which of the following conditions will lead to a negative ΔG?
  • A. High temperature and low ΔH
  • B. Low temperature and high ΔH
  • C. High temperature and high ΔS
  • D. Low temperature and low ΔS
Q. Which of the following conditions will lead to a positive ΔG?
  • A. High temperature and low entropy.
  • B. Low temperature and high enthalpy.
  • C. High temperature and high entropy.
  • D. Low temperature and low enthalpy.
Q. Which of the following conditions will lead to a spontaneous reaction?
  • A. ΔH > 0 and ΔS < 0
  • B. ΔH < 0 and ΔS > 0
  • C. ΔH > 0 and ΔS > 0
  • D. ΔH < 0 and ΔS < 0
Q. Which of the following equations relates Gibbs Free Energy to enthalpy and entropy?
  • A. ΔG = ΔH - TΔS
  • B. ΔG = TΔS - ΔH
  • C. ΔG = ΔH + TΔS
  • D. ΔG = ΔH / T + ΔS
Q. Which of the following expressions correctly relates ΔG, ΔH, and ΔS?
  • A. ΔG = ΔH + TΔS
  • B. ΔG = ΔH - TΔS
  • C. ΔG = TΔS - ΔH
  • D. ΔG = ΔH + ΔS
Q. Which of the following factors does NOT affect Gibbs Free Energy?
  • A. Temperature
  • B. Pressure
  • C. Concentration of reactants
  • D. Nature of the solvent
Q. Which of the following factors does NOT affect the Gibbs Free Energy of a system?
  • A. Temperature
  • B. Pressure
  • C. Concentration of reactants
  • D. Nature of the solvent
Q. Which of the following is a correct expression for Gibbs Free Energy?
  • A. ΔG = ΔH + TΔS
  • B. ΔG = ΔH - TΔS
  • C. ΔG = TΔS - ΔH
  • D. ΔG = ΔS - ΔH
Q. Which of the following is a correct unit for Gibbs Free Energy?
  • A. Joules per mole (J/mol)
  • B. Kilojoules (kJ)
  • C. Calories (cal)
  • D. All of the above
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