CHEM 133-QUESTIONS

CHEM 133-QUESTIONS Part 1 of 2 - Part 01 48.0/ 48.0 Points Question 1 of 25 4.0/ 4.0 Points Which bond has the highest bond dissociation energy?  A. N≡N  B. All three bonds should have about the same dissociation energy.  C. N-N  D. N=N Feedback: See Chapter 07 Question 2 of 25 4.0/ 4.0 Points Calculate the Lattice Energy of KCl(s) given the following data using the Born-Haber cycle: ΔHsublimation K = 79.2 kJ/mol IE1 K = 418.7 kJ/mol Bond EnergyCl–Cl = 242.8 kJ/mol EACl = 348 kJ/mol ΔHKCl(s) = –435.7 kJ/mol  A. 288 kJ/mol  B. -165 kJ/mol  C. 828 kJ/mol  D. 707 kJ/mol  E. 629 kJ/mol Feedback: See Chapter 07 Question 3 of 25 4.0/ 4.0 Points Estimate the heat of combustion for one mole of acetylene: C2H2(g) + O2(g) → 2CO2(g) + H2O(g) Bond Bond Energy (kJ/mol) C≡C 839 C–H 413 O=O 495 C=O 799 O–H 467  A. -447 kJ  B. -1228 kJ  C. 1228 kJ  D. 365 kJ  E. 447 kJ Feedback: See Chapter 07 Question 4 of 25 4.0/ 4.0 Points Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B?  A. The AB bond is largely covalent with a δ+ on A.  B. The compound is largely ionic with A as the anion.  C. The compound is largely ionic with A as the cation.  D. The AB bond is largely covalent with a δ- on A. Feedback: See Chapter 07 Question 5 of 25 4.0/ 4.0 Points Use the following bond energies to estimate the enthalpy change for the following reaction, one mole of CH4 with chlorine gas to give CH3Cl and hydrogen chloride. BEC–H = 414 kJ/mol B