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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.