Physical Chemistry

Q. For a process with ΔH = 200 kJ and ΔS = 0.5 kJ/K, what is ΔG at 400 K?
  • A. 200 kJ
  • B. 180 kJ
  • C. 220 kJ
  • D. 160 kJ
Q. For a reaction A → B, if the rate of formation of B is 0.5 mol/L/s, what is the rate of disappearance of A?
  • A. 0.5 mol/L/s
  • B. 1.0 mol/L/s
  • C. 0.25 mol/L/s
  • D. 2.0 mol/L/s
Q. For a reaction A → B, if the rate of reaction doubles when the concentration of A is doubled, what is the order of the reaction with respect to A?
  • A. Zero order
  • B. First order
  • C. Second order
  • D. Third order
Q. For a reaction at constant temperature and pressure, which of the following is true?
  • A. ΔG = ΔH + TΔS
  • B. ΔG = ΔH - TΔS
  • C. ΔG = TΔS - ΔH
  • D. ΔG = ΔS - ΔH
Q. For a reaction at equilibrium, if the concentration of products increases, what will happen to the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Depends on temperature
Q. For a reaction at standard conditions, if ΔG° is negative, what can be said about the equilibrium constant (K)?
  • A. K < 1
  • B. K = 1
  • C. K > 1
  • D. K is undefined
Q. For a reaction at standard conditions, if ΔG° is positive, what can be said about the reaction?
  • A. The reaction is spontaneous in the forward direction.
  • B. The reaction is spontaneous in the reverse direction.
  • C. The reaction is at equilibrium.
  • D. The reaction is impossible.
Q. For a reaction at standard conditions, if ΔG° is positive, what does it imply?
  • A. The reaction is spontaneous in the forward direction.
  • B. The reaction is at equilibrium.
  • C. The reaction is non-spontaneous in the forward direction.
  • D. The reaction will proceed rapidly.
Q. For a reaction at standard conditions, if ΔG° is positive, what does it indicate?
  • A. The reaction is spontaneous in the forward direction.
  • B. The reaction is non-spontaneous in the forward direction.
  • C. The reaction is at equilibrium.
  • D. The reaction is spontaneous in the reverse direction.
Q. For a reaction with ΔH = 100 kJ and ΔS = 200 J/K, at what temperature will the reaction become spontaneous?
  • A. 500 K
  • B. 250 K
  • C. 200 K
  • D. 100 K
Q. For a reaction with ΔH = 100 kJ/mol and ΔS = 200 J/mol·K, at what temperature will the reaction become spontaneous?
  • A. 500 K
  • B. 250 K
  • C. 200 K
  • D. 100 K
Q. For a reaction with ΔH = 50 kJ/mol and ΔS = 100 J/mol·K, at what temperature will the reaction become spontaneous?
  • A. 500 K
  • B. 250 K
  • C. 1000 K
  • D. 200 K
Q. For a reversible process, the change in entropy is given by which of the following?
  • A. ΔS = Q/T
  • B. ΔS = W/T
  • C. ΔS = Q + W
  • D. ΔS = 0
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 reversible process, the efficiency of a Carnot engine is given by which formula?
  • A. 1 - (T2/T1)
  • B. T1/T2
  • C. T2/T1
  • D. 1 - (T1/T2)
Q. For a solution to obey Raoult's Law, the interactions between solute and solvent must be:
  • A. Stronger than those in the pure components.
  • B. Weaker than those in the pure components.
  • C. Similar to those in the pure components.
  • D. Non-existent.
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) 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 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:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Undefined
Q. For a zero-order reaction, how does the rate change with concentration?
  • A. Increases linearly
  • B. Decreases linearly
  • C. Remains constant
  • D. Increases exponentially
Q. For a zero-order reaction, how does the rate change with respect to concentration?
  • A. Increases linearly
  • B. Decreases linearly
  • C. Remains constant
  • D. Increases exponentially
Q. For an electron in a 3d orbital, what are the possible values of l?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Q. For an electron in a 3d orbital, what are the possible values of m_l?
  • A. -2, -1, 0, 1, 2
  • B. -1, 0, 1
  • C. 0, 1
  • D. 0, 1, 2
Q. For an electron in a 3p orbital, what are the possible values of m_l?
  • A. -1, 0, +1
  • B. 0, +1, +2
  • C. -2, -1, 0
  • D. 0, -1, -2
Q. For an electron in a 3p orbital, what are the possible values of the magnetic quantum number (m_l)?
  • A. -1, 0, +1
  • B. 0, +1, +2
  • C. -2, -1, 0
  • D. 1, 2, 3
Q. For an electron in a 5d orbital, what are the possible values of m_l?
  • A. -2, -1, 0, 1, 2
  • B. -3, -2, -1, 0, 1, 2, 3
  • C. 0, 1, 2
  • D. -1, 0, 1
Q. For an ideal solution, if the mole fraction of the solvent is 0.75, what is the vapor pressure of the solution if the vapor pressure of the pure solvent is 100 mmHg?
  • A. 75 mmHg
  • B. 100 mmHg
  • C. 25 mmHg
  • D. 50 mmHg
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