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 SiO_2?

Silicon is bonded to two oxygen atoms, each with a triple bond.

Silicon is bonded to two oxygen atoms, each with a single bond, and all atoms have a complete octet.

Silicon is bonded to two oxygen atoms, each with a double bond, and all atoms have a complete octet.

Silicon is bonded to one oxygen atom with a double bond and one oxygen atom with a single bond.

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Verified step by step guidance

Step 1: Identify the total number of valence electrons available for the molecule SiO_2. Silicon (Si) has 4 valence electrons, and each oxygen (O) atom has 6 valence electrons. Since there are two oxygen atoms, total valence electrons = 4 + 2 × 6 = 16 electrons.

Step 2: Determine the skeletal structure of SiO_2. Silicon is the central atom bonded to two oxygen atoms. Connect Si to each O with a single bond initially, which uses 2 electrons per bond, totaling 4 electrons.

Step 3: Distribute the remaining electrons to satisfy the octet rule. After forming two single bonds, 16 - 4 = 12 electrons remain. Place these electrons as lone pairs on the oxygen atoms to complete their octets first.

Step 4: Check if all atoms have complete octets. Oxygen atoms need 8 electrons each (including bonding electrons), and silicon also needs 8 electrons. If the octet is not complete for silicon, convert lone pairs on oxygen atoms into double bonds with silicon to share more electrons.

Step 5: Confirm the final Lewis structure where silicon is double bonded to each oxygen atom, and all atoms have complete octets. This structure satisfies the octet rule and uses all valence electrons correctly.