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

How many lone pairs of electrons are present in the Lewis dot structure of hydrazine (N2H4)?

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Verified step by step guidance

Step 1: Determine the total number of valence electrons in hydrazine (N2H4). Nitrogen (N) has 5 valence electrons and hydrogen (H) has 1 valence electron. Calculate the total by multiplying the number of each atom by its valence electrons and summing them up: $2 \times 5 + 4 \times 1$.

Step 2: Draw the skeletal structure of hydrazine, connecting the two nitrogen atoms with a single bond and attaching the four hydrogen atoms to the nitrogens (two hydrogens per nitrogen).

Step 3: Distribute electrons to satisfy the octet rule for each nitrogen atom. Each bond (N-H or N-N) represents 2 shared electrons. Subtract the bonding electrons from the total valence electrons to find the remaining electrons to be placed as lone pairs.

Step 4: Assign the remaining electrons as lone pairs on the nitrogen atoms. Since hydrogen atoms only form one bond and do not have lone pairs, all lone pairs will be on the nitrogen atoms.

Step 5: Count the lone pairs on the nitrogen atoms. Each lone pair consists of 2 electrons. The total number of lone pairs on both nitrogen atoms combined is the answer.