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 CH2Br (bromomethane)?

The carbon atom has one lone pair and forms single bonds with two hydrogen atoms and one bromine atom.

The central carbon atom forms double bonds with both hydrogen atoms and a single bond with bromine.

The central carbon atom forms single bonds with two hydrogen atoms and one bromine atom, and has no lone pairs.

The bromine atom forms a double bond with carbon and has no lone pairs.

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Verified step by step guidance

Recall that the Lewis dot structure represents the valence electrons of atoms in a molecule, showing bonds as shared electron pairs and lone pairs as dots around atoms.

Determine the total number of valence electrons in CH2Br: Carbon has 4, each hydrogen has 1, and bromine has 7 valence electrons. Sum these to find the total electrons to be distributed.

Identify the central atom, which is usually the least electronegative element that can form multiple bonds; here, carbon is the central atom bonded to two hydrogens and one bromine.

Assign single bonds between carbon and each hydrogen and bromine atom, using 2 electrons per bond, and then distribute the remaining electrons to satisfy the octet rule for carbon and bromine, remembering hydrogen only needs 2 electrons.

Check for lone pairs: Carbon typically has no lone pairs in such compounds, while bromine usually has three lone pairs to complete its octet; verify that the structure has no double bonds and that all atoms have complete valence shells.