Grade 12 Chemistry: Lewis Structures
A comprehensive worksheet for Grade 12 Chemistry students focusing on drawing and understanding Lewis Structures for various molecules and polyatomic ions.
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Grade 12 Chemistry: Lewis Structures
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Read each question carefully and provide detailed answers. Show all your work for drawing Lewis Structures, including calculating total valence electrons, identifying the central atom, and distributing electrons.
1. Draw the Lewis Structure for the following molecules:
a) H₂O
b) CO₂
c) NH₃
d) CCl₄
1. In a Lewis structure, a single dash represents a bond, which consists of electrons.
2. The total number of valence electrons for the sulfate ion (SO₄²⁻) is .
3. The central atom in a Lewis structure is usually the least atom.
4. Atoms typically aim to achieve a stable electron configuration with valence electrons, known as the rule.
1. Which of the following molecules contains a triple bond?
O₂
N₂
CH₄
HCN
1. Draw the Lewis Structure for the nitrate ion (NO₃⁻). Be sure to include resonance structures if applicable and indicate formal charges.
2. Draw the Lewis Structure for the ammonium ion (NH₄⁺).
1. All atoms in a Lewis structure must satisfy the octet rule.
True
False
2. Formal charge helps to determine the most plausible Lewis structure.
True
False
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