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 neutral N2H4 (hydrazine)?

The two nitrogen atoms are connected by a triple bond, with each nitrogen bonded to one hydrogen atom.

Each nitrogen atom is bonded to three hydrogen atoms and has no lone pairs.

Each nitrogen atom is bonded to one hydrogen atom and to the other nitrogen atom, with two lone pairs on each nitrogen.

Each nitrogen atom is bonded to two hydrogen atoms and to the other nitrogen atom, with one lone pair on each nitrogen.

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Verified step by step guidance

Recall that the Lewis dot structure represents the valence electrons of atoms, showing bonds as shared electron pairs and lone pairs as non-bonded electrons.

Determine the total number of valence electrons in N2H4: Nitrogen has 5 valence electrons, hydrogen has 1, so total electrons = 2 × 5 + 4 × 1 = 14 electrons.

Arrange the atoms with the two nitrogen atoms connected to each other, and each nitrogen bonded to hydrogen atoms. Since hydrazine is neutral, all valence electrons must be accounted for in bonds and lone pairs.

Assign bonds: each nitrogen forms a single bond with the other nitrogen and two single bonds with hydrogen atoms, using 6 electrons for bonds (3 bonds × 2 electrons each).

Distribute the remaining electrons as lone pairs on the nitrogen atoms to satisfy the octet rule; each nitrogen will have one lone pair (2 electrons), completing their octet.