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Understanding Chemical and Physical Changes: Key Differences and Examples

This guide explains the distinctions between chemical and physical changes in matter. Physical changes involve alterations in size, shape, or state, such as crumpling paper, melting ice, or cutting. In contrast, chemical changes result in new substances, such as ash from burning wood. Indicators of chemical changes include gas production, precipitate formation, and color changes. Energy is involved in chemical changes, with some being irreversible. Learn to identify and differentiate these fundamental concepts of chemistry.

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Understanding Chemical and Physical Changes: Key Differences and Examples

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  1. Chemical and Physical Changes

  2. Physical Changes • A change in the size, shape, state, or form of matter. No new substance is made. • Ex • Crumpling paper • Dissolving • Ice melting • Cutting something in half • Blowing up a balloon

  3. Chemical Changes • A change in matter where one or more substances change into new substances with different chemical and physical properties. • Ex: • Fire • After a log is set on fire, it is not a log anymore, it is ash and gas.

  4. How to Spot a Chemical Change • A NEW gas is made • When a new gas is formed, it is a new substance that has been made. If a substance changes into its gas form, that is a physical change. • A precipitate forms • When two or more substances are combined and a new solid forms. • Color change • Color changes indicate chemical change.

  5. Energy and Chemical Change • Chemical changes require energy changes. • Energy is taken in • Baking food • Baking soda and vinegar • Energy is released • Fireworks • bombs

  6. Reversing a Change • Most chemical changes cannot be reversed • Fireworks cannot change back • You can’t remake an Alka-Seltzer tablet • Some physical changes can be reversed • You can flatten out a piece of paper • You cannot un-grate a carrot • You can separate salt from water it was dissolved in.

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