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 for SiCl2Br2?

Silicon is the central atom, bonded to two chlorine atoms and two bromine atoms, with two lone pairs on silicon.

Silicon is the central atom, bonded to two chlorine atoms and two bromine atoms, with no lone pairs on silicon.

Silicon is the central atom, bonded to one chlorine atom and three bromine atoms, with one lone pair on silicon.

Silicon is the central atom, bonded to four chlorine atoms, with no bromine atoms present.

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Verified step by step guidance

Step 1: Identify the central atom in the molecule SiCl2Br2. Silicon (Si) is less electronegative than chlorine (Cl) and bromine (Br), so Si will be the central atom.

Step 2: Determine the total number of valence electrons available. Silicon has 4 valence electrons, each chlorine has 7, and each bromine has 7. Calculate the sum: $4 + 2 \times 7 + 2 \times 7$.

Step 3: Arrange the atoms around the central silicon atom. Since the formula is SiCl2Br2, place two chlorine atoms and two bromine atoms bonded to silicon.

Step 4: Draw single bonds between silicon and each of the four halogen atoms. Each bond uses 2 electrons, so subtract $4 \times 2 = 8$ electrons from the total valence electrons.

Step 5: Distribute the remaining electrons as lone pairs to satisfy the octet rule for the chlorine and bromine atoms first. Then check if silicon has any lone pairs left. Silicon typically forms four bonds and has no lone pairs in this structure.