Topic 2: Chemical Bonding and Structure

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

1. What is a dative covalent bond?

  • A bond formed from the overlap of an empty orbital and a lone pair
  • A bond where one atom donates 3 electrons
  • A bond with a large difference in electronegativity between the two atoms
  • A bond vunerable to nucelophilic attack
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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
  • 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
  • Molecules vibrate more when cold and thus move apart, making the solid less dense

3. Which of these is not a property of ionic compounds?

  • High melting points
  • Often soluble in water
  • Conduct when solid
  • Brittle

4. What is a pi-bond?

  • The sideways overlap of two p-orbitals
  • The stronger bond in a double bond, with electron density trapped between nuclei
  • The end on overlap of two p-orbitals
  • The end on overlap of two s-orbitals

5. Which of these molecules doesn't have H bonds?

  • NH4
  • H2O
  • CH4
  • C2H2OH


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