Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

4. Molecular Compounds

Lewis Dot Structures: Neutral Compounds (Simplified)

GOB Chemistry

4. Molecular Compounds

Lewis Dot Structures: Neutral Compounds (Simplified)

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Multiple Choice

Determine the Lewis Dot Structure for the following compound:H₂Se.

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Identify the total number of valence electrons in the compound. Hydrogen (H) has 1 valence electron and Selenium (Se) has 6 valence electrons. Therefore, H2Se has a total of 2(1) + 6 = 8 valence electrons.

Determine the central atom. In H2Se, Selenium (Se) is the central atom because it is less electronegative than Hydrogen (H) and can form more bonds.

Place the central atom (Se) in the center and arrange the Hydrogen atoms around it. Connect each Hydrogen atom to the Selenium atom with a single bond. This uses up 2 electrons per bond, totaling 4 electrons for the two H-Se bonds.

Distribute the remaining valence electrons around the central atom to satisfy the octet rule. After forming the bonds, 4 electrons remain (8 total - 4 used in bonds). Place these 4 electrons as lone pairs on the Selenium atom.

Verify that all atoms have a complete valence shell. Hydrogen atoms are satisfied with 2 electrons each, and Selenium should have 8 electrons around it, including the bonding and lone pairs.