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Shapes of molecules

Shapes of molecules. Why ICE floats on WATER ? ?. Why ICE floats on WATER ? ?. Question 2: . Why doesn’t ICE behave as most solid & sink ?. Question 3: . volume of ICE > volume of water ?. Question 4: . How would the shapes/structure of ICE affect its density ?.

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Shapes of molecules

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  1. Shapes of molecules

  2. Why ICE floats on WATER ? ? Why ICE floats on WATER ? ?

  3. Question 2: Why doesn’t ICE behave as most solid & sink ?

  4. Question 3: volumeof ICE > volume of water ?

  5. Question 4: How would the shapes/structure of ICE affect its density ?

  6. Valence Shell Electron Pairs Repulsion [VSEPR] • Electron pairs tend to arrange themselves in such a way to minimise repulsion. 

  7. Valence Shell Electron Pairs Repulsion [VSEPR] • Two types of electron pairs • Lone pairs • Bond pairs

  8. Valence Shell Electron Pairs Repulsion [VSEPR] • Lone pairs electrons (not involved in covalent bonding) are closer to the nucleus • Lone pair electrons would have a greater repulsion force compare with bond pair electrons.

  9. Lone-pair - lone-pair repulsion > lone pair-bond pair repulsion > bond pair-bond pair repulsion

  10. Steps in predicting shapes of molecules 1 Draw the Lewis structure of molecules 2 (a) Count the no. of bond pair electrons (b) Count the no. of lone pair electrons 3(a)Apply the VSEPR theory (b)Determine the shape of molecules

  11. BeCl2 linear http://www.chemguide.co.uk

  12. H2 O V-shape/bent http://www.chemguide.co.uk

  13. BF3 Trigonal planar http://www.chemguide.co.uk

  14. NH3 Trigonal pyramidal http://www.chemguide.co.uk

  15. Predict the shapes of • CO2 • H2S • AlCl3 • NCl3

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