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 FREEZING Releases energy

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

7. Phase change: Liquid to gas EVAPORATION Absorbs energy

8. Phase change: Gas to liquid CONDENSATION Releases energy

9. Phase change: Solid to gas SUBLIMATION Absorbs energy

10. Phase change: Gas to solid DEPOSITION Releases energy

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

12. Tearing

13. Breaking

15. Bending

16. Stretching

17. Heating

18. Chiseling

19. Piercing

20. Crushing

21. Change in Shape DEFORMATION Absorbs energy

22. NOTES Workbook p. 27 Homework: Workbook p. 28

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

24. Chemical Equations

27. Law of conservation of mass

28. 5 Signs of a Chemical Change

29. 5 Signs of a chemical change Release of a gas

30. 5 Signs of a chemical change Colour change

31. 5 Signs of a chemical change Generation of light and/or heat

32. 5 Signs of a chemical change Formation of a precipitate

33. Types of Chemical Change

34. Synthesis A + B  AB Synthesis is the formation of a complex molecule from atoms or simpler molecules. Example: Photosynthesis 6CO 2 + 6H 2 O + energy  C 6 H 12 O 6 + 6O 2 OR

35. Decomposition AB  A + B Decomposition is the transformation of a complex molecule into simpler molecules or into atoms. Example: Respiration C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + energy OR

36. Oxidation Releases energy

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

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

39. NOTES Workbook p. 29-30 Homework: Workbook p. 31-33