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Chemical properties
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Chemical properties

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Transcript

  • 1. Chemical Properties
  • 2. Goals:
    • To describe chemical properties of matter.
    • To learn the clues that indicate that a chemical change has taken place.
    • To distinguish between chemical and physical changes.
  • 3. Access Prior Knowledge:
    • What caused the car in the first slide to rust?
  • 4. What is a chemical property?
    • The ability to produce a change in the composition of matter.
    • They can be observed only when one substance in a sample of matter is changed into another substance.
    • Ex.-whenever something is burned, that substance becomes something completely different. The ability to burn is a chemical property.
  • 5. Flammability
    • The ability to burn in the presence of oxygen.
  • 6. Reactivity
    • How easily a substance combines chemically with another substance.
    Oxygen easily reacts with many other elements. What other element is oxygen reacting with in this photo?
  • 7. How Can You Recognize Chemical Changes?
    • A change in color – Ex. The green patina on an old copper roof.
    • Production of a Gas – Ex. Using baking powder and water in a cake mix. CO 2 is produced which helps the cake rise.
    • Formation of a Precipitate – (any solid that forms and separates from a liquid). Ex. Adding vinegar to milk causes the proteins to clump together.
  • 8.  
  • 9. Can you think of physical changes that exhibit these clues also?
  • 10. Is a change in color always an indicator of a chemical change?
  • 11. Is the formation of a gas always an indicator of a chemical change?
  • 12. Physical v. Chemical Changes
    • Before you decide whether a chemical change has actually taken place, ask yourself this question: Are different substances present after the change takes place? If not, it is a physical change (the composition of the matter stays the same).

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