Exam 9: Chemical Bonding I: Basic Concepts

What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for the fulminate ion, CNO^-, based on minimizing formal charge overall

Assuming the octet rule is obeyed, how many covalent bonds will a nitrogen atom form to give a formal charge of zero

Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C₂H₂, burns in excess oxygen to yield carbon dioxide and water vapor at 25 ^$\circ$ C. BE(C-C) = 347 kJ/mol BE(C $\equiv$ C) = 812 kJ/mol BE(C=O in CO₂) = 799 kJ/mol BE(C-H) = 414 kJ/mol BE(O-H) = 460 kJ/mol BE(O=O) = 498.7 kJ/mol

Which one of the following compounds utilizes both ionic and covalent bonding

Which of the following ionic solids would have the largest lattice energy

Shown here is a Lewis structure for the chlorate ion, ClO₃^-, that obeys the octet rule, showing all non-zero formal charges. How many resonance structures for ClO₃^- are possible that obey the octet rule

Which of the elements listed below is most likely to exhibit an expanded octet in its compounds

For which of these species does the best Lewis structure have two or more equivalent resonance structures

The structure below depicts the correct Lewis structure for Dichloromethane, CH₂Cl₂ (an important solvent in synthetic chemistry).

The number of lone electron pairs in the N₂ molecule is ___.

Use the bond enthalpy data given to estimate the heat released when 50.0 g of propane gas, C₃H₈, burns in excess oxygen to yield carbon dioxide and water vapor at 25 ^$\circ$ C. BE(C-C) = 347 kJ/mol BE(C=O in CO₂) = 799 kJ/mol BE(C-H) = 414 kJ/mol BE(O-H) = 460 kJ/mol BE(O=O) = 498.7 kJ/mol

The total number of valence electrons in the ion NH₄⁺ is

The electron dot formula for O₂ shows

Which one of the following molecules has an atom with an incomplete octet

The bond in F₂ is described as polar covalent.

Assuming the octet rule is obeyed, how many covalent bonds will an oxygen atom form to give a formal charge of zero

How many resonance phosphate Lewis structures can be drawn for the phosphate ion, PO₄^3-, that obey the octet rule

A molecule with two resonance structures is shifting quickly back and forth from one structure to the other.

The number of lone electron pairs in the ClO₄^- ion is ___.

Arrange the elements C, O, and H in order of increasing electronegativity.