Objective: Children will perform an experiment with different liquids to determine what freezes.‹ Return to Theme
Note: Have the children work in small groups. This activity will require two days, freezing the liquids overnight to observe the next day.
In many areas the winter temperatures are so cold that many liquids freeze. Lakes, ponds, and puddles freeze, but the ocean does not freeze. The reason for this is that ocean water contains quite a bit of salt. Salt water freezes at a much lower temperature than plain water. The ocean can freeze, but usually only in very cold places near land, such as close to the North and South Poles.
Things can be done to liquids to change them, but not all liquids will respond the same way. Freezing liquids is one way to change them from a liquid to a solid. When liquids begin to freeze, a tiny ice crystal forms first. This ice crystal then grows as other particles in the liquid attach themselves to the ice crystal. Different liquids freeze at different temperatures. Water will freeze faster than liquids with salt or sugar in them. Some liquids freeze faster than others because of viscosity, or thickness of the liquid. Viscosity is the resistance of a liquid to flow. For instance, a cup of honey will take longer to pour than a cup of water because the honey has higher viscosity. Thicker liquids will freeze more slowly and some will not freeze at all.
These lessons are aligned with the Common Core State Standards ("CCSS"). The CCSS provide a consistent, clear understanding of the concepts and skills children are expected to learn and guide teachers to provide their students with opportunities to gain these important skills and foundational knowledge.
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There are currently no Common Core Standards for pre-k, but these lessons are aligned as closely as possible to capture the requirements and meet the goals of Common Core Standards. However, these lessons were neither reviewed or approved by the National Governors Association Center for Best Practices or the Council of Chief State School Officers, which together are the owners and developers of the Common Core State Standards.