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Properties and Changes in Matter

Properties and Changes in Matter. Chapter 20 Glencoe Science. Physical Property. A characteristic that you can observe without changing or trying to change the composition of the substance. Physical Property.

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Properties and Changes in Matter

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  1. Properties and Changes in Matter Chapter 20 Glencoe Science

  2. Physical Property • A characteristic that you can observe without changing or trying to change the composition of the substance.

  3. Physical Property • How something looks, smells, sounds, or tastes are all examples of physical properties.

  4. Physical Properties • You can detect many physical properties with your senses.

  5. Mass • Mass is a measurement of how much matter an object contains.

  6. Weight • Weight is a measurement of force. • Weight depends on the mass of the object and on gravity. • No matter where you are in the universe your mass never changes, but your weight can.

  7. Density • Density measures the amount of mass in a given volume. • Density = mass/volume • D=m/v

  8. Solubility • Solubility is the ability of one substance to dissolve into another substance.

  9. Melting Point • The temperature at which a solid changes into a liquid is called its melting point.

  10. Boiling Point • The temperature at which a liquid changes into a gas is called its boiling point.

  11. Magnetism • Magnetism is a physical property.

  12. Chemical Property • A chemical property is a characteristic that cannot be observed without altering the substance.

  13. Chemical Properties • Examples of chemical properties: Flammability, rusting, reacting with substances like acids

  14. Physical Changes • A physical change is one in which the form or appearance of matter changes, but not its composition.

  15. Changing State • Vaporization is the process by which matter changes from a liquid state to a gas.

  16. Changing State • Condensation is the process where a gas changes into a liquid.

  17. Changing State • Sublimation is the process in which a solid changes directly into a gas. • Ex: dry ice

  18. Changing State • Deposition is the process in which a gas changes into a solid.

  19. Chemical Changes • Chemical changes occur when substances are changed into different substances.

  20. Clues to Chemical Changes • Color change is an example of a chemical change.

  21. Clues to Chemical Changes • Another sign of a chemical change is the release or gain of energy by an object.

  22. Clues to Chemical Changes • The change in odor is a clue to a chemical change.

  23. Signs of Chemical Changes • The production of bubbles is a sign that a chemical change has taken place.

  24. Clues to Chemical Changes • Another clue to a chemical change is the formation of a solid.

  25. Chemical Changes • The substances produced during a chemical change cannot be changed back into the original substances by physical means.

  26. Chemical vs. Physical • During a physical change the composition of the substance does not change, but during a chemical change the composition of the substance does change. Chemical change Physical change

  27. Conservation of Mass • Law of conservation of mass states that mass is neither created nor destroyed. As a result the mass of the substances before a physical or chemical change is equal to the mass of the substances present after the change.

  28. Chemical vs. Physical • Chemical and Physical Changes Game

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