Topic 2: Chemical Bonding and Structure

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

1. What is the most significant reason why HF has a higher boiling point than HCl?

  • Chlorine's larger number of electrons means more shielding of the nucleus therefore more repulsion between atoms in the H-Cl bond
  • HF is more polar so can create stronger permanent dipole-dipole forces
  • HF can form strong hydrogen bonds between molecules, HCl cannot
  • The H-F bond has a higher bond enthalpy than H-Cl
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2. Which of these has the lowest boiling point?

  • 2-methylhexane
  • 2,2,dimethylpropane
  • But-1-ene
  • ethanol

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

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

4. What is a dative covalent bond?

  • A bond vunerable to nucelophilic attack
  • A bond where one atom donates 3 electrons
  • A bond formed from the overlap of an empty orbital and a lone pair
  • A bond with a large difference in electronegativity between the two atoms

5. Which of these molecules doesn't have a dative bond?

  • NH4+
  • H3O+
  • PCl5
  • Al2Cl6

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