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Preliminary chemistry

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Module 3 | Water

Focus 2: The wide distribution and importance of water on Earth is a consequence of its molecular structure and hydrogen bonding

Lesson 1 | Polarity of molecules

  • Identify the water molecule as a polar molecule.

  • Construct Lewis electron dot structures of water, ammonia and hydrogen sulfide to identify the distribution of electrons.

  • Compare the molecular structure of water, ammonia and hydrogen sulfide, the differences in their molecular shapes and in their melting and boiling points.

Lesson 2 | Intermolecular forces

  • Describe the attractive forces between polar molecules as dipole-dipole forces.

  • Describe hydrogen bonding between molecules.

Lesson 3 | Properties of water

  • Identify data and process information from secondary sources to model the structure of the water molecule and effects of forces between water molecules.

  • Explain the following properties of water in terms of its intermolecular forces:
    – surface tension
    – viscosity
    – boiling and melting points

  • Choose equipment and perform first-hand investigations to demonstrate the following properties of water:
    – surface tension
    – viscosity

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