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.
After completing this tutorial, you will be able to complete the following:
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.
|Approximate Time||2 Minutes|
|Pre-requisite Concepts||Students should be able to define the following terms: Antifreeze, decrease in freezing point, and icing.|
|Type of Tutorial||Animation|
|Key Vocabulary||Antifreeze, decrease in freezing point, icing|