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Understanding Lewis Structures: Analysis of PCl3, SCl2, CS2, CH4, and Water

Explore the fundamental concepts of Lewis structures through the analysis of various molecules, including phosphorus trichloride (PCl3), sulfur dichloride (SCl2), carbon disulfide (CS2), and methane (CH4). This study guide also delves into the Lewis structure of water (H2O) and examines electron sharing and repulsion in molecular geometry. Utilizing VSEPR theory, we discuss molecular shapes and exceptions to the octet rule, enhancing your understanding of chemical bonding and molecular interactions.

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Understanding Lewis Structures: Analysis of PCl3, SCl2, CS2, CH4, and Water

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  1. 7th inning stretch Draw the Lewis structure for each: • PCl3 2. SCl2 3. CS2 4. CH4

  2. 7th inning stretch Draw the Lewis structure for each: • PCl3 2. SCl2 3. CS2 4. CH4

  3. The lewis structure of water: unshared e- .. : H 2 X 1e- =2e- __ O H H O 1 X 6e- =6e- Shared e- Total 8e- - 4e- bonded 4 e- Water has 2 shared & 2 unshared pairs of e-

  4. - + What did you observe?

  5. e- move towards the protons

  6. What holds electrons in an atom?

  7. e- like protons

  8. Do electrons like each other electrons?

  9. NO

  10. - - What did you observe between the electrons?

  11. e- Repel e- move as far away from each other…..

  12. However, they do exist in pairs (remember two per e- cloud shape)

  13. V S E P R THEORY Draw the following table:

  14. V S E P R THEORY linear CO2 Cl2 2 2 0 Trigonal Planar BCl3 CH2O 3 3 0 NH3 PCl3 4 3 1 Pyramidal CH4 CBr4 Tetrahedral 4 4 0 SCl2 H2O 4 2 2 Bent

  15. Pyramidal

  16. Bent

  17. Molecule Phet

  18. Which is a molecule? • CO2 • CaCl2 • NH4Cl • Li2SO4

  19. 2. Which would have a linear shape? • HBr • CO2 • Both are linear

  20. 3. Which has only single bonds? • HBr • CO2 • Both have all single bonds

  21. 4. What shape is water? • Tetrahedral • Bent • Trigonal planar • Linear

  22. 5. Which is an example of an exception to the octet rule? • O2 • N2 • BF3 • I2 • More than one of these

  23. 5ans. Which is an example of an exception to the octet rule? • O2 • N2 • BF3 • I2 • More than one of these

  24. 6. Which molecule could be represented with this diagram? • BH3 • CH4 • NH3

  25. 7. Which molecule could be represented with this diagram? • HCl • CH4 • NH3 • F2

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