Chemistry

CH1000 Chemical Principles Info and multiple choice

VSEPR

VSEPR THEORY

- Valence Shell Electron Pair Repulsion Theory (VSEPRT) Suggested by Sidgwick and Powell 1940, extended by Gillespie and Nyholm

- Bonding Pairs and lone pairs of electrons around an atom are positioned as far apart as possible (reduces e-e repulsion)

- Decide on the central atom Consider only the valence electrons of the central atom and those shared with attached atoms Assume that electrons are paired in bonds or lone pairs From the number of pairs of electrons deduce the favoured arrangement of electron pairs and hence the shape of the molecule

Using VSEPR determine the shape of the molecule PCl5.

  • Tetrahedral
  • Trigonal Bipyramid
  • Trigonal Pyramidal
  • Trigonal Planar

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Untitled multiple choice question

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Revision Resources

Match Up

  • How many bonding pairs are there in a T-shaped molecule?
    3 bonding pairs
  • How many electron pairs are in a Square planar structure?
    6 electron pairs
  • If a molecule has 1 lone pair and 5 bonding pairs, what's its shape?
    Square pyramidal
  • What is the structure with 1 lone pair and 4 bonding pairs?
    See-saw

multiple choice question

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