Physical and Chemical Changes

Physical and Chemical Changes
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  • Barnaby and Barney (Pt 1)
  • It sure was cold out there! Hey, Barnaby.
  • Well, I came to ask you a question. Why is there water on your face?
  • Barnaby and Barney (Pt 2)
  • Oh, that is because the snow and ice on my face melted to water. Do you know what type of change is that?
  • No. And what is the difference between a Physical and Chemical change anyways?
  • Barnaby and Barney (Pt 3)
  • Yes. I know, it might seem weird, but snow is just frozen water. The molecules are still made up of water.
  • Oh, okay. Since you already know the two types of changes, it won't be too hard. A physical change is a change where the chemical makeup of the substance does not change. For example, the snow melting was a physical change.
  • Really?
  • Barnaby and Barney (Pt 4)
  • Barney comes inside after playing in the snow. 
  • A chemical change is where the chemical makeup of the substances does change. For example, when water hits the iron on the oven, the iron rusts. That is a chemical change.
  • Okay, but how do I tell when it is a chemical change?
  • Barnaby and Barney (Pt 5)
  • Yes! But why?
  • Now let me quiz you. Is the souring milk in the refrigerator a physical or chemical change?
  • A chemical change right?
  • Barnaby and Barney (Pt 6)
  • Great job, Barnaby! 
  • There are a few ways to tell a chemical change. A change in color, a change in smell, the formation of a gas, the appearance of a precipitate, or a change in light.
  • Well, the milk smells horrible now, thats a change in smell. Also there are new molecules added with the change, and the process can not be reversed without special chemical methods.
  • Remember, today we learned about changes and the difference between physical and chemical changes. See you next time!
  • To be continued... Maybe.
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