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

After drawing the Lewis structure of PF3, what are its electron domain geometry and molecular geometry?

Electron domain geometry: trigonal bipyramidal; Molecular geometry: T-shaped

Electron domain geometry: trigonal planar; Molecular geometry: trigonal planar

Electron domain geometry: tetrahedral; Molecular geometry: trigonal pyramidal

Electron domain geometry: tetrahedral; Molecular geometry: tetrahedral

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Verified step by step guidance

Step 1: Draw the Lewis structure of PF3 by first counting the total valence electrons. Phosphorus (P) has 5 valence electrons, and each fluorine (F) has 7 valence electrons. Since there are 3 fluorines, total valence electrons = 5 + (3 × 7) = 26 electrons.

Step 2: Connect the phosphorus atom to each fluorine atom with a single bond. Each bond uses 2 electrons, so 3 bonds use 6 electrons. Distribute the remaining electrons to complete the octets of the fluorine atoms first.

Step 3: After placing lone pairs on fluorines, assign any leftover electrons to the phosphorus atom. Check if phosphorus has a complete octet or if it has lone pairs. In PF3, phosphorus has one lone pair and three bonding pairs.

Step 4: Determine the electron domain geometry by counting all electron domains (bonding pairs + lone pairs) around phosphorus. Here, there are 4 electron domains (3 bonding pairs + 1 lone pair), which corresponds to a tetrahedral electron domain geometry.

Step 5: Determine the molecular geometry by considering only the positions of atoms (ignoring lone pairs). With one lone pair and three bonded atoms, the molecular geometry is trigonal pyramidal.