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Combined science (Edexcel Higher)
Chemistry of carbon

Starter quiz

  • Select the diagram that shows ionic bonding.
    • sodium chloride (NaCl)
      sodium chloride (NaCl)  ✓
    • methane (CH₄)
      methane (CH₄)
    • lithium (Li)
      lithium (Li)
  • In a dot and cross diagram, what do the dots and crosses represent?
    • different elements
    • protons and neutrons
    • electrons from different atoms  ✓
    • ionic and covalent bonds
    • positive and negative charges
  • Which type of bonding involves the sharing of electron pairs between atoms?
    • ionic bonding
    • covalent bonding  ✓
    • metallic bonding
  • The number of outer shell electrons in a carbon atom is ...
    • 2.
    • 4.  ✓
    • 6.
    • 12.
  • A molecule is ...
    • an atom with a full outer shell.
    • a group of ions bonded together.
    • a group of atoms bonded ionically.
    • a group of atoms bonded covalently.  ✓
    • a single atom.
  • Which of the following substances are classed as covalent molecules?
    • carbon dioxide (CO₂)  ✓
    • water (H₂O)  ✓
    • potassium nitrate (KNO₃)
    • iron (Fe)
    • neon (Ne)
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