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Physical and Chemical Changes
Physical and Chemical Changes
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.