Use the bond energies provided to estimate ΔH°rxn for the reaction below

1) Which of the following represents the Lewis structure for N?

2) Give the complete electronic configuration for Br-.

  • A) 1s22s22p63s23p64s24p6
  • B) 1s22s22p63s23p64s24d104p6
  • C) 1s22s22p63s23p64s23d104p6
  • D) 1s22s22p63s23p64s23d104p5
  • E) 1s22s2p63s2p64s23d104p6

3) Give the complete electronic configuration for Ca2+.

  • A) 1s22s22p63s24p6
  • B) 1s22s22p63s23p6
  • C) 1s22s22p63s23p5
  • D) 1s22s23p64s25p6
  • E) 1s22s2p63s2p6

4) Which of the following statements is TRUE?

  • A) An ionic bond is much stronger than most covalent bonds.
  • B) An ionic bond is formed through the sharing of electrons.
  • C) Ionic compounds at room temperature typically conduct electricity.
  • D) Once dissolved in water, ionic compounds rarely conduct electricity.
  • E) None of the above is true.

5) Use Lewis theory to determine the chemical formula for the compound formed between Al and O.

  • A) Al3O2
  • B) Al2O3
  • C) AlO2
  • D) Al2O
  • E) AlO

6) Identify the shortest bond.

  • A) single covalent bond
  • B) double covalent bond
  • C) triple covalent bond
  • D) All of the above bonds are the same length.

7) Identify the weakest bond.

  • A) single covalent bond
  • B) double covalent bond
  • C) triple covalent bond
  • D) All of the above bonds are the same strength.

8) Identify the strongest bond.

  • A) single covalent bond
  • B) double covalent bond
  • C) triple covalent bond
  • D) All of the above bonds are the same strength

9) Identify the number of bonding pairs and lone pairs of electrons in water.

  • A) 1 bonding pair and 1 lone pair
  • B) 1 bonding pair and 2 lone pairs
  • C) 2 bonding pairs and 2 lone pairs
  • D) 2 bonding pairs and 1 lone pair
  • E) 3 bonding pairs and 2 lone pairs

10) Define electronegativity.

  • A) the ability of an atom to repel neutrons in a chemical bond
  • B) the ability of an atom to repel electrons in a chemical bond
  • C) the ability of an atom to attract protons to itself in a chemical bond
  • D) the ability of an atom to attract neutrons to itself in a chemical bond
  • E) the ability of an atom to attract electrons to itself in a chemical bond

11) Choose the best Lewis structure for CH2Cl2.

12) Choose the best Lewis structure for BF3.

13) Define bond energy.

  • A) energy required to form 1 mole of the bond in the solid phase
  • B) energy required to form 1 mole of the bond in the gas phase
  • C) energy required to break 1 mole of the bond in the liquid phase
  • D) energy required to break 1 mole of the bond in the gas phase
  • E) energy required to break 1 mole of the bond in the solid phase

14) A reaction is exothermic when

  • A) weak bonds break and strong bonds form.
  • B) strong bonds break and weak bonds form.
  • C) weak bonds break and weak bonds form.
  • D) strong bonds break and strong bonds form.

15) Which compound has the longest carbon-carbon bond length?

  • A) CH3CH3
  • B) CH2CH2
  • C) HCCH
  • D) All bond lengths are the same.

16) Which compound has the shortest carbon-carbon bond length?

  • A) CH3CH3
  • B) CH2CH2
  • C) HCCH
  • D) All bond lengths are the same

17) Which compound has the highest carbon-carbon bond strength?

  • A) CH3CH3
  • B) CH2CH2
  • C) HCCH
  • D) All bond strengths are the same.

18) Use the bond energies provided to estimate ΔH°rxn for the reaction below.

Use the bond energies provided to estimate ΔH°rxn for the reaction below.

PCl3(g) + Cl2(g) → PCl5(l) ΔH°rxn = ?

Bond   Bond Energy (kJ/mol)

Cl-Cl   243

P-Cl    331

  • A) -243 kJ
  • B) -419 kJ
  • C) -662 kJ
  • D) -67 kJ
  • E) -905 kJ

19) Use the bond energies provided to estimate ΔH°rxn for the reaction below.

2 Br2(l) + C2H2(g) → C2H2Br4(l)  ΔH°rxn = ?

Bond   Bond Energy (kJ/mol)

Br-Br  193

C≡C    837

C-C    347

C-Br   276

C-H    414

  • A) +407 kJ
  • B) -324 kJ
  • C) -228 kJ
  • D) +573 kJ
  • E) -648 kJ

20) Identify an ionic bond.

  • A) Electrons are pooled.
  • B) Electrons are shared.
  • C) Electrons are transferred.
  • D) Neutrons are gained.

Can’t find the questions that you need? Post Your Questions