Chemical and Physical Changes

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  • Hello, today we will be looking at a chemical change.
  • Excuse me! What is a chemical change exactly?
  • Let me refresh your mind a bit, a chemical change is when two substances mix together. When they mix together, their atoms rearrange and create a new compound.
  • Oh! I remember now, thanks Mr. Hunt
  • Now, each group has one beaker and one graduated cylinder. I want you with your group to pour the sulfuric acid into the sugar.
  • Woah! this is so cool, this is a chemical change, right?
  • Yes, Tom. Finally you get something right!
  • Well Tom, baking a cake, burning wood, and a the rusting of a nail would all be considered chemical changes.
  • Mr. Hunt, what other things are considered chemical changes
  • No, you dweeb. That would be a physical change.
  • So, would breaking glass, also be a chemical change?
  • A physical change is when the appearance of a substance is changed, rather than the atoms being rearranged.
  • What exactly is a physical change, Mr. Hunt?
  • So, chopping wood, tearing paper, and crushing a can would all be physical changes.
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