1. NEXT

2. Physical Change “The physical properties of a substance change, but the identity of the substance does not change.” NEXT

3. Chemical Properties A chemical property is any characteristic that gives a substance the ability to undergo a change that results in a new substance. 4 Examples of chemical properties: –Reacts to water –Reacts to light –Reacts to oxygen –Flammability

4. Chemical Change “A change in the identity of a substance due to the chemical properties of that substance. A NEW substance or substances are formed as a result of the change.” NEXT

5. Signs of a Chemical Change Bubbles Production of Heat Light Smoke Change in Color Sound NEXT

6. Is a chemical change reversible? A chemical change can only be reversed by a chemical reaction, not by physical means.

7. Are these examples chemical or physical changes? NEXT

8. A Rusting Bicycle ANSWER

9. Chemical Change Oxygen in the air reacts with the metal of the bicycle. This produces a new substance called rust. NEXT

10. Melting Butter for Popcorn ANSWER

11. Physical Change Heating causes the butter to change from a solid to a liquid. The identity of the butter does not change. NEXT

12. Hammering Wood Together to Build a Birdhouse ANSWER

13. Physical Change Hammering the wood together causes the wood to change shape. The identity of the wood does not change. NEXT

14. Spoiling Food ANSWER

15. Chemical Change Spoiling food changes color and has a foul odor. Bacteria, mold, enzyme action, and oxidation cause spoilage. NEXT

16. Mixing Lemonade Powder into Water ANSWER

17. Physical Change After mixing the lemonade powder and water, lemonade powder and water are still present. Evaporating the water separates the ingredients. NEXT

18. Mowing the Lawn ANSWER

19. Physical Change Cutting the grass does not change the identity of the grass. NEXT

20. Fireworks Exploding ANSWER

21. Chemical Change Fireworks are composed of different metals, such as copper. After ignited, the fireworks produce light, heat, and sound. NEXT

22. Water Boiling ANSWER

23. Physical Change When water boils, water changes from a liquid to a gas. The identity of the water does not change. NEXT

24. Photosynthesis ANSWER

25. Chemical Change Plants change carbon dioxide, water, and sunlight into sugar and oxygen. New substances are formed. NEXT

26. Separating a Mixture of Rocks and Sand ANSWER

27. Physical Change Separating the rocks from the sand can be done by physical means. The identities of the rocks and sand do not change. NEXT

28. Adding Food Coloring to Water ANSWER

29. Physical Change The identities of the substances did not change. Water and food coloring are still present. NEXT

30. Adding Vinegar to Baking Soda ANSWER

31. Chemical Change Gas bubbles were produced. The baking soda and vinegar reacted to form bubbles of carbon dioxide. HOME

32. Can HEAT cause a chemical reaction? YES !

33. Can LIGHT cause a chemical reaction ? YES, Photosynthesis

34. What is a sign of a physical change? A change in a physical property : Shape, size, length, change phase (solid, liquid, gas)

35. SIGNS OF A CHEMICAL CHANGE: HEATLIGHT SMOKEBUBBLES COLOR CHANGE SOUND NEW IDENTITY CAN’T BE REVERSED BY PHYSICAL MEANS

36. What is….? A change in the identity of a substance due to the chemical properties of that substance. Chemical change

37. What is….? Any characteristic of a material that can be observed or measured without changing the identity of the material. Physical property

38. Any characteristic that gives a substance the ability to undergo a change that results in a new substance. Chemical Property

39. What is….? Any characteristic of a material that can be observed without changing the identity of the material. Physical Property

40. Examples of Physical Properties : Boiling pointfreezing point Melting point Volumeshape Densitylength ColorMass

41. Examples of Chemical Properties: Flammability Reacts with oxygen Reacts with H20 Ability to change with light

42. A ___________change results in a new substance, with a new…. IDENTITY