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Topic 2 – Changes in Matter

Topic 2 – Changes in Matter. Types of Changes. Matter can change in one of two ways. Physical change – This is a change in which no new substance is produced. Eg . Melting, freezing, dissolving, breaking things, etc… These changes are “usually” easy to reverse.

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Topic 2 – Changes in Matter

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  1. Topic 2 – Changes in Matter

  2. Types of Changes • Matter can change in one of two ways. • Physical change – This is a change in which no new substance is produced. Eg. Melting, freezing, dissolving, breaking things, etc… These changes are “usually” easy to reverse.

  3. Chemical Changes. This is a change when one or more new substances are produced. Eg cooking, rusting, burning, etc… The new substances have properties that are very different from the original materials. (Compare a pile of ashes with the pile of wood that it came from)

  4. Indicators of a Chemical Change • Heat is produced or absorbed. (it gets hotter or colder) • A new substance is produced. (burning always produces water vapour and carbon dioxide. • There may be an unusual change in color. • A gas is produced. (May be bubbles)

  5. 5. A precipitate may form. (a semi-solid substance in the bottom of a liquid) • The change is difficult to reverse • The starting materials are used up. Not all of these indicators has to be present but usually, several are.

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