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Changes in Matter

Learn about the differences between physical and chemical changes in matter, including their characteristics and examples. Understand the signs of chemical reactions and how various substances transform. Discover key properties of common gases like oxygen and carbon dioxide.

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Changes in Matter

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  1. Changes in Matter Physical Change • Can be reversed • No new material created • Phase change

  2. Chemical Change • Cannot be reversed • New substance made • One or more of the following occur: * color change * temperature change (hotter or colder) * flashes of light or sound * gas produced ~ bubbles * new odor

  3. Signs of Chemical Reactions There are five main signs that indicate a chemical reaction has taken place: release input change in color change in odor production of new gases or vapor input or release of energy difficult to reverse

  4. Physical or Chemical Change

  5. Frying an Egg

  6. Chemical Color change Odor change Cant turn it back into raw egg

  7. Boiling Water

  8. Physical • Change in state of matter only • Can turn steam back into liquid • Molecules are still H2O

  9. Burning gasoline • www.wusa9.com/news

  10. Chemical • New material made • Odor change • Cant turn back to gasoline

  11. Sour Milk

  12. Chemical • Odor change • Taste change • New chunky substance made • Cant turn back to milk

  13. Compression of a spring

  14. Physical • Still a spring • Returns to normal shape after it is released

  15. Rusting bicycle timberspringsphotography.com

  16. Chemical • Color change • Texture change • Cant turn back to metal • New material

  17. Gases No definite shape Lots of energy Volume can change Often created in a chemical reaction

  18. Oxygen O Colorless Odorless Tasteless Flammable Fuels a fire

  19. Hydrogen H Colorless Odorless Tasteless Explosive in fire Makes a “popping” noise In fire

  20. Carbon Dioxide CO2 • Colorless • Odorless • Tasteless • Dense • Puts out a fire

  21. Test for Type of Gas Glowing wood splint

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