Topic 2: Chemical Bonding and Structure

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  • Created by: LouiseG
  • Created on: 16-04-16 11:42

1. Which of these phrases is correct?

  • A molecule can have polar bonds and not have an overall polarity
  • All molecules with polar bonds have permanent dipoles
  • CO2 is a polar molecule
  • A molecule whose dipoles reinforce each other must be symmetrical.
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2. What causes ice to be less dense than liquid water?

  • There are no intermolecular interactions between molecules as solids so the molecules drift apart
  • Molecules vibrate more when cold and thus move apart, making the solid less dense
  • Hydrogen bonds between molecules in ice create an open and spaced "cage" structure, which breaks down on melting
  • Molecules pack more efficiently in the water liquid due to strong hydrogen bonds pulling molecules together at 180o of each other

3. Which of these molecules does not have 8 electrons around the central atom?

  • N2
  • H2O
  • PCl5
  • HOCl

4. Which of these interactions is weakest?

  • Covalent bond
  • Hydrogen bonds
  • Permanent dipole
  • London Forces/induced dipoles

5. If a molecule has two bonded and two lone pairs; it's ...

  • v-shaped
  • got a bond angle of 109.5
  • trigonal bipyramidal
  • tetrahedral

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