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Physical and Chemical Changes

Physical and Chemical Changes. Grade 9 Science. Definition. A physical change does not affect the nature or the characteristic properties of the matter being altered. Types of Physical Changes. Phase change: Liquid to solid. Releases energy. FREEZING.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes Grade 9 Science

  2. Definition A physical change does not affect the nature or the characteristic properties of the matter being altered.

  3. Types of Physical Changes

  4. Phase change: Liquid to solid Releases energy FREEZING

  5. Phase change: Solid to liquid Absorbs energy MELTING (FUSION)

  6. Phase change: Liquid to gas Absorbs energy EVAPORATION

  7. Phase change: Gas to liquid Releases energy CONDENSATION

  8. Phase change: Solid to gas Absorbs energy SUBLIMATION

  9. Phase change: Gas to solid Releases energy DEPOSITION

  10. Creating a solution by dissolving a solute in a solvent OR DISSOLUTION

  11. Tearing

  12. Breaking

  13. Breaking

  14. Bending

  15. Stretching

  16. Heating

  17. Chiseling

  18. Piercing

  19. Crushing

  20. Change in Shape Absorbs energy DEFORMATION

  21. NOTESWorkbook p. 27 Homework: Workbook p. 28

  22. Definition A chemical change changes the nature and the characteristic properties of matter.

  23. Chemical Equations

  24. Chemical Equations

  25. Chemical Equations

  26. Law of conservation of mass

  27. 5 Signs of a Chemical Change

  28. 5 Signs of a chemical change Release of a gas

  29. 5 Signs of a chemical change Colour change

  30. 5 Signs of a chemical change Generation of light and/or heat

  31. 5 Signs of a chemical change Formation of a precipitate

  32. Types of Chemical Change

  33. Synthesis OR A + B  AB Synthesis is the formation of a complexmolecule from atoms or simpler molecules. Example: Photosynthesis 6CO2 + 6H2O + energy  C6H12O6 + 6O2

  34. Decomposition OR AB  A + B Decomposition is the transformation of a complexmolecule into simpler molecules or into atoms. Example: Respiration C6H12O6 + 6O26CO2+ 6H2O + energy

  35. Oxidation Releases energy

  36. Oxidation involving a great deal of energy = COMBUSTION Releases energy

  37. Precipitation • Two solutions combine to form a solid that is not soluble. Video OR

  38. NOTESWorkbook p. 29-30 Homework: Workbook p. 31-33

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