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Topic 2

Topic 2. Changes in Matter. Properties of Matter. Physical Properties Are used to describe a substance Chemical Properties Describe how a substance interacts with other substances. Chemical properties are only observable when a chemical change occurs. Properties of Matter.

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Topic 2

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  1. Topic 2 Changes in Matter

  2. Properties of Matter • Physical Properties • Are used to describe a substance • Chemical Properties • Describe how a substance interacts with other substances. Chemical properties are only observable when a chemical change occurs.

  3. Properties of Matter • Physical Properties

  4. Physical Properties • Qualitative Property • A characteristic of a substance that can be described but might not be measured (a quality) • Quantitative Property • A characteristic of a substance that can be measured numerically (a quantity)

  5. Changes in Matter • Physical Changes • A substance changes form but not chemical composition • Chemical Changes • Causes one or more new substances to be formed. It may be impossible to reverse.

  6. Properties of Matter • Physical Changes

  7. Properties of Matter • Chemical Changes • Reacts with water • Reacts with air • Reacts with pure oxygen • Reacts with acids • Reacts with other pure substances • Toxicity • Stability • Combustibility

  8. Identifying Physical and Chemical Changes • Look at the following pictures and document whether you think each is an example of a physical or chemical change.

  9. Physical or Chemical Change? • It is difficult to determine whether changes are physical or chemical. • The following chart will help you decide whether a chemical change has occurred. • In order to be completely sure, chemical analysis in a lab must take place.

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