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Warm Up # 8

Warm Up # 8. Draw the following, label the number of sigma bonds and pi bonds for each: H 3 0 +1 HCN SCN -1 Look at SCN -1 . There are actually two correct ways you could draw it. Try to figure out both ways. Octet Exceptions and Partial Positive/Negatives.

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Warm Up # 8

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  1. Warm Up # 8 • Draw the following, label the number of sigma bonds and pi bonds for each: • H30+1 • HCN • SCN-1 • Look at SCN-1. There are actually two correct ways you could draw it. Try to figure out both ways.

  2. Octet Exceptions and Partial Positive/Negatives

  3. Octet Exceptions:Phosphorus and Sulfur • Phosphorus = 5 valence • CAN HAVE 5 bonds • Ex. PCl5 or PO4-3 • Sulfur = 6 valence • CAN HAVE 6 bonds • Ex. SF6 or SO4-2 NOT TRUE FOR NITROGEN OR OXYGEN

  4. Resonance Structures • Resonance Structures – same compound, different bond combinations • Ex. SCN-1, CO3-2, etc. • Show the combos. With two-sided arrow

  5. Partial Positives/Negatives • Ex. N2O • To bond: • Nitrogen loses e- (+1) • Oxygen gains e- (-1) • Collectively: NEUTRAL • Ex. NO3-1, SO3-2,

  6. Steps when Bonding • 1. Connect dots with single bonds first • 2. Double/Triple bonds if necessary • 3. Add electrons to outside atoms if necessary (- charge) • 4. Take electrons away from central atom first (+ charge), THEN add e- to outside atoms

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