Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

General Chemistry

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

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Multiple Choice

Which of the following statements correctly describes the Lewis dot structure of the neutral compound CH4N2O (urea)?

The central carbon atom is double-bonded to an oxygen atom, single-bonded to two nitrogen atoms, and single-bonded to four hydrogen atoms.

The central carbon atom is double-bonded to an oxygen atom and single-bonded to two nitrogen atoms, each of which is bonded to two hydrogens.

The central carbon atom is double-bonded to an oxygen atom, single-bonded to two nitrogen atoms, and each nitrogen is single-bonded to one hydrogen atom.

The central carbon atom is single-bonded to an oxygen atom, double-bonded to one nitrogen atom, and single-bonded to four hydrogen atoms.

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Verified step by step guidance

Identify the molecular formula CH4N2O and recognize that it corresponds to urea, a common organic compound with a known structure.

Recall that in urea, the central atom is carbon (C), which typically forms four bonds to satisfy its valence of four electrons.

Understand that the carbon atom forms a double bond with the oxygen atom (O) to satisfy oxygen's valence of two bonds, and single bonds with two nitrogen atoms (N).

Each nitrogen atom in urea typically forms three bonds to satisfy its valence of five electrons; since each nitrogen is bonded to carbon and one hydrogen, the remaining bonds are accounted for by one hydrogen atom per nitrogen.

Verify that the total number of hydrogens (4) is consistent with the structure: two hydrogens bonded to the two nitrogens (one each) and the remaining two hydrogens bonded elsewhere if applicable, ensuring the structure matches the molecular formula and valence rules.