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Tonight’s Homework:

Tonight’s Homework:. Read section 9.1 and do problem 12 on page 247. Covalent Bonds. Covalent Bonds. The positive nucleus of one atom attracts the negative electrons of the other atom. Covalent Bonds. The atoms move closer. Covalent Bonds.

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Tonight’s Homework:

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  1. Tonight’s Homework: • Read section 9.1 and do problem 12 on page 247.

  2. Covalent Bonds

  3. Covalent Bonds • The positive nucleus of one atom attracts the negative electrons of the other atom.

  4. Covalent Bonds • The atoms move closer.

  5. Covalent Bonds • If they get too close, the positive nuclei repel each other.

  6. Covalent Bonds • There is a balance point where the attraction and the repulsion cancel out.

  7. Covalent Bonds • Atoms will stay at this balance point. • They have a stable bond. • They are a molecule.

  8. Covalent Bonds • Atoms in a covalent bond don’t give away electrons or take them from other atoms. • In a covalent bond, atoms share electrons.

  9. Covalent Bonds • F F • Both atoms want one more electron.

  10. Covalent Bonds • F F • They can share these two.

  11. Covalent Bonds • F F • Now both atoms are happy.

  12. Covalent Bonds • F F • This atom has eight outer electrons.

  13. Covalent Bonds • F F • So does this one.

  14. Covalent Bonds • F F • A dot diagram for a molecule is called a Lewis structure

  15. Covalent Bonds • F-F • The pair of shared electrons • can be drawn as a line.

  16. Covalent Bonds • O O • Oxygen wants two more electrons.

  17. Covalent Bonds • O O • They’ll share this pair...

  18. Covalent Bonds • O O • …and this pair.

  19. Covalent Bonds • O O • Oxygen atoms share two pairs • of electrons.

  20. Covalent Bonds • O O • Again, both atoms seem like they have eight outer electrons.

  21. Covalent Bonds • O O • Again, both atoms seem like they have eight outer electrons.

  22. Covalent Bonds • O=O • They have a double bond, which can be drawn as two lines.

  23. Covalent Bonds • N N • Nitrogen wants three more electrons.

  24. Covalent Bonds • N N • Nitrogen wants three more electrons.

  25. Covalent Bonds • N N • A nitrogen molecule has a • triple bond.

  26. Covalent Bonds • N≡N • A nitrogen molecule has a • triple bond.

  27. Covalent Bonds • H • Hydrogen often forms covalent bonds with other elements.

  28. Covalent Bonds • H O H • Hydrogen often forms covalent bonds with other elements.

  29. Covalent Bonds • H O H • Hydrogen often forms covalent bonds with other elements.

  30. Covalent Bonds • H-O-H • Hydrogen often forms covalent bonds with other elements.

  31. You try some! • Draw the Lewis structure for the molecule • PH3

  32. You try some! • Draw the Lewis structure for the molecule • H-P-H • H

  33. You try some! • Draw the Lewis structure for the molecule • H2S

  34. You try some! • Draw the Lewis structure for the molecule • H-S-H

  35. You try some! • Draw the Lewis structure for the molecule • HCl

  36. You try some! • Draw the Lewis structure for the molecule • H-Cl

  37. You try some! • Draw the Lewis structure for the molecule • CCl4

  38. You try some! • Draw the Lewis structure for the molecule • Cl • Cl-C-Cl • Cl

  39. You try some! • Draw the Lewis structure for the molecule • SiH4

  40. You try some! • Draw the Lewis structure for the molecule • H • H-Si-H • H

  41. Tonight’s Homework: • Read section 9.1 and do problem 12 on page 247.

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