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Exploring Physical and Chemical Properties

Learn about physical and chemical properties of substances. Discover how to determine them without altering identity. Explore reversible and irreversible changes, and signs of chemical reactions.

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Exploring Physical and Chemical Properties

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  1. “What’s the Matter?” Chem 332 – O’Dette

  2. Properties • Physical Property – determined without changing the identity of a substance • EX: color, freezing/melting point, shape, density, hardness • With a partner, describe the physical properties of the object below?

  3. properties • Chemical Property – can only be tested by doing a chemical reaction • EX: flammability, acidity/basicity, reactivity

  4. Changes • Physical Change – original substance still exists, just changes form; can be reversible or irreversible • EX: Ice Melting • EX: Hair Cut Reversible Irreversible

  5. changes • Chemical Change – when a new substance is produced • Signs of a Chemical Change – DEMOS!!! • Change in color • Formation of a solid from two liquids (precipitate) • Heat produced or heat absorbed • Formation of a gas or bubbles

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