Chem Energetics review

Which of the following chemical equations represents a standard enthalpy change of formation?

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Which of the following chemical equations represents both a standard enthalpy change of formation and combustion?

• S (g) + O₂ (g) -> SO₂ (g)

• SO (g) + ½O₂ (g) -> SO₂ (g)

• S (s) + O₂ (g) -> SO₂ (g)

• SO₂ (g) + ½O₂ (g) -> SO₃ (g)

Which of the following chemical equations represents a standard enthalpy change of hydration?

• NaBr (s) + aq -> Na⁺ (aq) + Br^- (aq)

• Na (s) -> Na (l)

• Na⁺ (g) + H₂O -> Na⁺.H₂O (aq)

• Br^- (g) + aq -> Br^- (aq)

Which of the following chemical equations represents the second electron affinity of oxygen?

• O₂ (g) + 2e^- -> 2O^- (g)

• O (g) + 2e^- -> O^2- (g)

• O^- (g) + e^- -> O^2- (g)

• O⁺ (g) -> O²⁺ (g) + e^-

First electron affinity of an element is usually ________ and second electron affinity is ____________.

• exothermic, endothermic

• exothermic, exothermic

• endothermic, endothermic

• endothermic, exothermic

Which of the following are true regarding enthalpy change of atomisation?

• Enthalpy change of atomisation involves breaking both inter and intramolecular bonds

• Enthalpy change of atomisation for F₂ = 1/2 Bond energy

• Enthalpy change of atomisation for I₂ = 1/2 Bond energy

• Enthalpy change of atomisation of N₂ = 1/2 Bond energy

In the Born-Haber cycle shown, what are the enthalpy change values needed to calculate the lattice energy of MgS(s)?

• Enthalpy change of formation of MgS(s)

• Enthalpy change of atomisation of Mg

• Enthalpy change of vaporisation of Mg

• 1st ionisation energy of Mg

• 2nd ionisation energy of Mg

From the energy level diagram shown, which of the following is/are a correct application of Hess' Law?

• ΔH₁ + ΔH₂ + ΔH₃ + ΔH₄ = ΔH₅

• ΔH₁ + ΔH₅ + ΔH_{4 =} ΔH₂ + ΔH₃

• ΔH₂ + ΔH₃ + ΔH₄ = ΔH₁ + ΔH₅

• ΔH₁ = ΔH₂ + ΔH₃ - ΔH₄ - ΔH₅

On a scale of 1-5, how well do you think you have mastered Chem Energetics (Enthalpy changes, not including Entropy/Gibbs Free Energy)?

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