Liquids

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  • Hello class. Last week was all about periodic trends and how we use them. This week we are discussing the kinetic-molecular theory, and specifically how it applies to liquids. 
  • First, the postulate of the kinetic-molecular theory that applies to liquid is that they have enough kinetic energy to easily slide by each other. Therefore when melting, it is best described as molecules gaining enough kinetic energy to get past each other. Say if I were trying to pour a thick liquid into this beaker, to make it work I would have to apply heat to it.
  • Attraction of these molecules are important as well. For example at the top of a pool of water, the mutual attraction between the water molecules produces surface tension. As expected some liquids have fewer molecules than others. The ones that have very few are known as surfactants. As an example take hydraulics. Liquids are well suited for them because the liquids are incompressible. If you are looking at viscosity, the size and attraction varies so say I was looking for the lowest viscosity, then the size would be small and have nonpolar molecules.
  • Its not just the molecules of the liquids that make them different from other substances. There are different properties of these liquid particles like compressibility, and shape. 
  • BING! Thats all I have for today folks. Your homework is to conduct an experiment about any of the topics we talked about today. Have a great day.
  • I know what to do. Ill make a little cardboard boat and drop a bit of dish soap behind it. This will show that the soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
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