Q. For a reaction at equilibrium, the change in Gibbs free energy (ΔG) is equal to:
  • A. ΔH - TΔS
  • B. 0
  • C. ΔS - TΔH
  • D. ΔH + TΔS
Q. For a reversible process, the change in entropy of the system is equal to the heat absorbed divided by the temperature. This is expressed as:
  • A. ΔS = Q/T
  • B. ΔS = T/Q
  • C. ΔS = Q + T
  • D. ΔS = Q - T
Q. For a reversible process, the change in entropy of the system is equal to the heat absorbed divided by the temperature. What is the formula?
  • A. ΔS = Q/T
  • B. ΔS = T/Q
  • C. ΔS = Q*T
  • D. ΔS = Q + T
Q. For a reversible process, the change in entropy of the universe is:
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Undefined
Q. For a spontaneous process, the change in entropy of the universe must be:
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Undefined
Q. For a spontaneous process, the change in Gibbs free energy (ΔG) is related to entropy (ΔS) by which of the following equations?
  • A. ΔG = ΔH + TΔS
  • B. ΔG = ΔH - TΔS
  • C. ΔG = TΔS - ΔH
  • D. ΔG = ΔS - ΔH
Q. For a spontaneous process, the change in Gibbs free energy (ΔG) is related to entropy (ΔS) how?
  • A. ΔG = ΔH - TΔS
  • B. ΔG = TΔS - ΔH
  • C. ΔG = ΔS - ΔH
  • D. ΔG = ΔH + TΔS
Q. For a spontaneous process, the change in Gibbs free energy (ΔG) is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Undefined
Q. If 100 J of heat is added to a system at a constant temperature of 300 K, what is the change in entropy?
  • A. 0.33 J/K
  • B. 0.25 J/K
  • C. 0.5 J/K
  • D. 0.75 J/K
Q. If the entropy of a system increases, what can be inferred about the spontaneity of the process?
  • A. The process is non-spontaneous
  • B. The process is spontaneous
  • C. The process is at equilibrium
  • D. None of the above
Q. If the temperature of a system is increased, what happens to its entropy?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
Q. In a closed system, if the temperature increases, what happens to the entropy?
  • A. It decreases
  • B. It increases
  • C. It remains constant
  • D. It becomes zero
Q. In an irreversible process, the change in entropy of the universe is:
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Undefined
Q. In which of the following reactions is the entropy change expected to be negative?
  • A. N2(g) + 3H2(g) → 2NH3(g)
  • B. C(s) + O2(g) → CO2(g)
  • C. 2H2(g) + O2(g) → 2H2O(g)
  • D. CaCO3(s) → CaO(s) + CO2(g)
Q. In which of the following scenarios is the entropy of the system likely to decrease?
  • A. Ice melting
  • B. Water freezing
  • C. Gas expanding
  • D. Liquid evaporating
Q. In which of the following scenarios would the entropy of the system decrease?
  • A. Ice melting
  • B. Water evaporating
  • C. Gas compressing
  • D. Sugar dissolving in water
Q. The entropy change for a phase transition at constant temperature is given by:
  • A. ΔS = ΔH/T
  • B. ΔS = T/ΔH
  • C. ΔS = ΔH*T
  • D. ΔS = ΔH + T
Q. The entropy change for a reaction can be calculated using which of the following?
  • A. ΔS = ΣS(products) - ΣS(reactants)
  • B. ΔS = ΣS(reactants) - ΣS(products)
  • C. ΔS = Q/T
  • D. ΔS = W/T
Q. The entropy of a perfect crystal at absolute zero is given by:
  • A. R
  • B. 0
  • C.
  • D. 1
Q. The entropy of a perfect crystal at absolute zero is:
  • A. Maximum
  • B. Minimum
  • C. Undefined
  • D. Infinite
Q. The entropy of a perfect crystal at absolute zero temperature is given by which law?
  • A. Third law of thermodynamics
  • B. First law of thermodynamics
  • C. Second law of thermodynamics
  • D. Zeroth law of thermodynamics
Q. The entropy of a perfect crystal at absolute zero temperature is given by:
  • A. 0
  • B. 1
  • C. Infinity
  • D. Depends on the substance
Q. The entropy of a perfect crystalline substance at absolute zero is given by which law?
  • A. Third law of thermodynamics
  • B. First law of thermodynamics
  • C. Second law of thermodynamics
  • D. Zeroth law of thermodynamics
Q. The entropy of a perfect crystalline substance at absolute zero is:
  • A. Zero
  • B. Maximum
  • C. Undefined
  • D. Infinite
Q. What is the change in entropy when 1 mole of an ideal gas expands isothermally and reversibly from volume V1 to V2?
  • A. R ln(V2/V1)
  • B. R (V2 - V1)
  • C. R (V1/V2)
  • D. 0
Q. What is the change in entropy when 1 mole of an ideal gas expands isothermally from volume V1 to V2?
  • A. R ln(V2/V1)
  • B. R (V2 - V1)
  • C. R (V1/V2)
  • D. 0
Q. What is the effect of increasing temperature on the entropy of a substance?
  • A. Entropy decreases
  • B. Entropy increases
  • C. Entropy remains constant
  • D. Entropy becomes zero
Q. What is the effect of temperature on the entropy of a substance?
  • A. Entropy decreases with increasing temperature.
  • B. Entropy increases with increasing temperature.
  • C. Entropy remains constant with temperature.
  • D. Temperature has no effect on entropy.
Q. What is the entropy change for a system that undergoes a phase transition at constant temperature?
  • A. ΔS = 0
  • B. ΔS = Q/T
  • C. ΔS = T/Q
  • D. ΔS = Q + T
Q. What is the entropy change for the isothermal expansion of an ideal gas from volume V1 to V2 at temperature T?
  • A. R ln(V2/V1)
  • B. R (V2 - V1)/T
  • C. 0
  • D. R (V1/V2)
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