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ZingPath: Phase Changes

LetÂ’s Decrease the Freezing Point of Water

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Phase Changes

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Let’s Decrease the Freezing Point of Water

Physical Science

Learning Made Easy

You will get to learn all about the various phase changes, from liquid to gas, solid to liquid, and many others. Turn up the heat and experiment with melting and boiling points, or keep things cool while learning how to alter the freezing point of liquids.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain the relationship between solubility and freezing point.

Everything You'll Have Covered

What happens to water when it reaches its freezing point?

~ When water reaches it freezing point, its molecules slow down and form a structure with a very clear pattern, called a regular crystalline structure. At this point, the liquid water becomes solid ice.

What happens to water when it reaches its freezing point if you add salt to it?

~ When you add salt to water, the ions that form the salt's structure insert themselves between the water molecules and delay the formation of a regular crystalline structure. As a result, the freezing point of the water is lower.

What are some everyday applications of this method called cryoscopy where salt is used to lower the temperature of water?

~ This form of cryoscopy with salt is used to melt ice on the roads in the winter.

How is alcohol used to decrease the temperature of water?

~ Alcohol is used in the form of antifreeze, which is added to water in car radiators in the winter to prevent it from freezing in cold temperatures.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define the following terms: Antifreeze, decrease in freezing point, and icing.
Course Physical Science
Type of Tutorial Animation
Key Vocabulary Antifreeze, decrease in freezing point, icing