Enthalpy change definitions

0 of 10 answered, 0 correct

1. Question 1 of 10

   Which equation represents the standard enthalpy change of formation of propan-1-ol, C₃H₇OH?

   AA, 6C(s) + 8H₂(g) + O₂(g) → 2C₃H₇OH(l)BB, 3C(s) + 4H₂(g) + ½O₂(g) → C₃H₇OH(l)CC, 3C(g) + 8H(g) + O(g) → C₃H₇OH(l)DD, C₃H₇OH(l) + 4½O₂(g) → 3CO₂(g) + 4H₂O(l)

2. Question 2 of 10

   Which equation represents the standard enthalpy change of combustion of propane?

   AA, 2C₃H₈(g) + 10O₂(g) → 6CO₂(g) + 8H₂O(l)BB, C₃H₈(g) + 3½O₂(g) → 3CO(g) + 4H₂O(l)CC, C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)DD, C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

3. Question 3 of 10

   Which of these has a standard enthalpy change of formation of zero?

   AA, H₂O(l)BB, O₃(g)CC, Br₂(l)DD, Br₂(g)

4. Question 4 of 10

   What is meant by the average (mean) bond enthalpy of the C–H bond?

   AA, The energy needed to break 1 mol of C–H bonds in gaseous molecules, averaged over a range of compoundsBB, The energy released when one C–H bond forms in methaneCC, The enthalpy change when 1 mol of methane is broken into gaseous atomsDD, The energy needed to break 1 mol of C–H bonds in methane only

5. Question 5 of 10

   The enthalpy change for which reaction is both the standard enthalpy change of formation of CO₂ and the standard enthalpy change of combustion of carbon?

   AA, C(s) + ½O₂(g) → CO(g)BB, CO(g) + ½O₂(g) → CO₂(g)CC, C(s) + O₂(g) → CO₂(g)DD, C(g) + O₂(g) → CO₂(g)

6. Question 6 of 10

   Which equation represents the standard enthalpy change of atomisation of chlorine?

   AA, ½Cl₂(g) → Cl(g)BB, Cl₂(g) → 2Cl(g)CC, Cl(g) + e⁻ → Cl⁻(g)DD, ½Cl₂(g) + e⁻ → Cl⁻(g)

7. Question 7 of 10

   Which equation represents the first electron affinity of oxygen?

   AA, ½O₂(g) + e⁻ → O⁻(g)BB, O⁻(g) + e⁻ → O²⁻(g)CC, O(g) → O⁺(g) + e⁻DD, O(g) + e⁻ → O⁻(g)

8. Question 8 of 10

   Which equation represents the enthalpy change of lattice formation of calcium fluoride?

   AA, Ca(s) + F₂(g) → CaF₂(s)BB, Ca²⁺(g) + 2F⁻(g) → CaF₂(s)CC, CaF₂(s) → Ca²⁺(g) + 2F⁻(g)DD, Ca²⁺(aq) + 2F⁻(aq) → CaF₂(s)

9. Question 9 of 10

   Which equation represents the enthalpy change of hydration of the magnesium ion?

   AA, Mg(s) + aq → Mg²⁺(aq) + 2e⁻BB, Mg²⁺(aq) → Mg²⁺(g)CC, Mg²⁺(g) + aq → Mg²⁺(aq)DD, MgCl₂(s) + aq → Mg²⁺(aq) + 2Cl⁻(aq)

10. Question 10 of 10

    Which equation represents the enthalpy change of solution of potassium bromide?

    AA, KBr(s) + aq → K⁺(aq) + Br⁻(aq)BB, K⁺(g) + Br⁻(g) + aq → K⁺(aq) + Br⁻(aq)CC, KBr(s) → K⁺(g) + Br⁻(g)DD, KBr(s) + H₂O(l) → KOH(aq) + HBr(aq)