00. Recap bonding

Lesson Outcomes:- To recap the differences between elements, compounds and mixtures.- To review the differences between ionic, covalent and metallic bonding by looking at specific examples and explaining their properties.

Activity: Use the M&Ms provided to make models that represent the arrangement of atoms in an element, a compound and a mixture. For each one you need to be able to justify and explain your model.

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Activity: In groups of 3 you must revise, research and explain the type of bonding and the general properties of the following three substances:

• • Magnesium, Mg

  • Sodium oxide, Na₂O

  • Carbon dioxide, CO₂

For each summary:

• 1. Name the type of bonding present,

  2. Show the structure (bonding) of the substance,

  3. State the general properties of the substance;

     • Appearance,

     • Melting point,

     • Hardness,

     • Electrical conductivity (when solid),

     • Solubility in water,

     • Electrical conductivity (when dissolved).

  4. Explain how the type of bonding causes the properties.