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 CH3NH2 (methylamine)?

The nitrogen atom has one lone pair and forms three single bonds: two to hydrogen and one to carbon.

The nitrogen atom forms four single bonds: three to hydrogen and one to carbon, with no lone pairs.

The carbon atom forms a double bond with nitrogen and two single bonds with hydrogen.

The nitrogen atom has two lone pairs and forms two single bonds: one to hydrogen and one to carbon.

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Verified step by step guidance

Identify the total number of valence electrons for each atom in CH3NH2: Carbon (C) has 4 valence electrons, each Hydrogen (H) has 1 valence electron, and Nitrogen (N) has 5 valence electrons.

Determine the bonding framework: Carbon typically forms 4 bonds, Nitrogen typically forms 3 bonds and has 1 lone pair, and Hydrogen forms 1 bond each.

Construct the Lewis structure by connecting the carbon atom to three hydrogen atoms (CH3 group) and to the nitrogen atom, then connect the nitrogen atom to two hydrogen atoms (NH2 group).

Assign lone pairs: After forming the bonds, place the remaining valence electrons as lone pairs on the nitrogen atom. Nitrogen should have one lone pair since it forms three bonds (two to hydrogen and one to carbon).

Verify the structure by checking that each atom satisfies the octet rule (or duet for hydrogen) and that the total number of valence electrons used matches the total available.