Lewis Structures
Chemistry ⇒ Chemical Bonding and Structure
Lewis Structures starts at 9 and continues till grade 12.
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See sample questions for grade 11
Calculate the formal charge on the nitrogen atom in the Lewis structure of NO₂⁻.
Calculate the total number of valence electrons in the Lewis structure of the sulfate ion (SO₄²⁻).
Describe the difference between a single, double, and triple bond in a Lewis structure.
Describe the steps involved in drawing the Lewis structure for SO₂.
Explain why the Lewis structure of BF₃ does not satisfy the octet rule for boron.
Explain why the Lewis structure of O₂ contains a double bond between the two oxygen atoms.
Explain why the Lewis structure of SF₆ violates the octet rule.
A student draws a Lewis structure for the molecule SF4 and places all lone pairs on the fluorine atoms. Explain why this structure is incomplete and describe the correct placement of lone pairs.
Which molecule has a central atom with an incomplete octet in its Lewis structure?
(1) BCl₃
(2) H₂O
(3) CO₂
(4) NH₃
Which of the following best describes a resonance structure?
(1) A structure with different numbers of atoms
(2) A structure with different arrangements of atoms
(3) A structure with different arrangements of electrons
(4) A structure with different types of bonds
Which of the following elements can have an expanded octet in their Lewis structures?
(1) Carbon
(2) Nitrogen
(3) Sulfur
(4) Fluorine
Which of the following ions has a Lewis structure with a double bond?
(1) NO₃⁻
(2) NH₄⁺
(3) CH₄
(4) H₃O⁺
Fill in the blank: In a Lewis structure, a _______ represents a pair of shared electrons between two atoms.
Fill in the blank: The Lewis structure of _______ contains three single bonds and one lone pair on the central atom.
In the Lewis structure of HCN, the bond between carbon and nitrogen is a _______ bond.
The Lewis structure of methane (CH₄) contains _______ single bonds.
True or False: Hydrogen can form more than one single covalent bond in a Lewis structure.
True or False: The Lewis structure of C₂H₄ (ethene) contains a double bond between the two carbon atoms.
True or False: The Lewis structure of ClO₃⁻ shows three single bonds between chlorine and oxygen.
True or False: The Lewis structure of CO₂ shows two double bonds between carbon and each oxygen atom.
