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Chapter 1, Lesson 2 Multimedia

Heating and Cooling a Liquid

This animation demonstrates how he molecules in water respond to changing temperature. The molecules move more rapidly as heat is added, and the distance between them is increased.

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  • The molecules in cold water move slowly and are close together.
  • As the water is heated, the molecules move faster and a little further apart.

Water Molecules at Different Temperatures

A composite drawing showing how the arangement and behavior of water molecules change as heat is added. In cold water, water molecules move slowly and are close together.  In room temperature water, w
  • The circles represent water molecules.
  • The molecules are randomly arranged.
  • They interact with each other because of their attractions.
  • The motion lines show that they are moving.