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Physical and Chemical Changes

Physical and Chemical Changes
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Middle School Math and Science

25 Facts about Chemical and Physical Changes

  • Physical changes are changes in appearance.
  • Examples would include cutting paper, folding clothes, or denting a car.
  • Physical changes do not create a new substance. 
  • For example, take a piece of paper and fold it into smaller pieces. 
  • This would be a physical change.
  • The paper still has the same properties as the original paper it just looks different.
  • Phase changes are physical changes.
  • When ice goes from a solid, to a liquid, and then a gas and back, it is a physical change.
  • Many mixtures are a physical change.
  • Mixing salt and water is a physical change because you can separate it later.
  • Chemical changes create a new substance.
  • It involves the breaking or making new chemical bonds between atoms.
  • Chemical changes leave behind clues or indicators that a chemical change has occurred.
  • 5 indicators of a chemical change.
  • Burning or fire indicates a chemical change.
  • A temperature change without heating or cooling is a chemical change.
  • An explosion is a chemical change. 
  • A change in color is a chemical change. This is usually a dramatic color change.
  • Think of burning paper, it changes from white to black.
  • A change in odor is an indicator of a chemical change. 
  • Bubbles or fizzing is also an indicator.
  • If you see any of these indicators then you know you have witnessed a chemical change.
  • In summary, a physical change is a change in appearance only, a chemical change creates a whole new substance.