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Chemical Properties & Physical and Chemical Changes

Warm-Up Sit down and complete the Phase Change Graph worksheet . Once you and your table-partner are finished, quietly share your answers with each other and be prepared to discuss with the class. Chemical Properties & Physical and Chemical Changes. Standard –

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Chemical Properties & Physical and Chemical Changes

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  1. Warm-UpSit down and complete the Phase Change Graph worksheet. Once you and your table-partner are finished, quietly share your answers with each other and be prepared to discuss with the class.

  2. Chemical Properties & Physical and Chemical Changes

  3. Standard – • S8P1. Students will examine the scientific view of the nature of matter. • d. Distinguish between physical and chemical properties of matter as physical (i.e., density, melting point, boiling point) or chemical (i.e., reactivity, combustibility).

  4. Essential Question: How can the physical and chemical properties of a substance be used to determine its identity?

  5. Physical changes are those changes that do not result in the production of a new substance.  If you melt a block of ice, you still have H2O at the end of the change.   

  6. If you break a bottle, you still have glass.  Painting your nails will not stop them from being fingernails.  Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.

  7. Some, but not all physical changes can be reversed. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!

  8. CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.

  9. Chemical changes, or chemical reactions, are changes that result in the production of another substance. 

  10. FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN

  11. REACTIVITY:How readily (easily) a substance combines chemically with other substances.

  12. Which has higher reactivity? A 14 karat gold ring or a cheap metal ring from the vending machine at the grocery store? What is your evidence?

  13. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon.  When light and carbon dioxide are used in photosynthesis, you are carrying out a chemical reaction that produces water and oxygen. 

  14. Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition. 

  15. Physical or Chemical Change? • Painting Wood • PHYSICAL

  16. Physical or Chemical Change? • Burning Paper • CHEMICAL

  17. Physical or Chemical Change? • Digestion of food • CHEMICAL

  18. Physical or Chemical Change? • Sugar dissolving in water • PHYSICAL

  19. Physical or Chemical Change? • Evaporation • PHYSICAL

  20. Physical or Chemical Change? • A pond freezing in winter • PHYSICAL

  21. Physical or Chemical Change? • Melting ice • PHYSICAL

  22. Physical or Chemical Change? • Fireworks exploding • CHEMICAL

  23. Physical or Chemical Change? • Cutting wire • PHYSICAL

  24. Physical or Chemical Change? • Painting fingernails • PHYSICAL

  25. Physical or Chemical Change? • Metal corroding • CHEMICAL

  26. Physical or Chemical Change? • Cutting fabric • PHYSICAL

  27. Physical or Chemical Change? • Baking muffins • CHEMICAL

  28. Physical or Chemical Change? • Shattering glass • PHYSICAL

  29. Physical or Chemical Change? • Decomposition of old leaves • CHEMICAL

  30. Physical or Chemical Change? • Wrinkling a shirt • PHYSICAL

  31. Physical or Chemical Change? • An old nail rusting • CHEMICAL

  32. Physical or Chemical Change? • Meat spoiling • CHEMICAL

  33. Physical or Chemical Change? • Melting rock into lava • PHYSICAL

  34. Physical or Chemical Change? • Hardening/cooling lava into rock • PHYSICAL

  35. Physical or Chemical Change? • Melting plastic • PHYSICAL

  36. Physical or Chemical Change? • Burning plastic • CHEMICAL

  37. Physical or Chemical Change? • Making plastic • CHEMICAL

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