1. CHEMISTRY Unit 3 & Unit 4 Review

2. Element An element is a pure substance made of only one kind of matter. The Periodic Table lists all the known elements

3. Element Cube Each element on the Periodic Table gives information about the element

5. Know how to find: Protons (5) Electrons (5) Atomic Mass (11) Neutrons (Atomic Mass-Protons = 6)

6. Show me… Groups stay together Period!

7. Rare Earth 1 2 3 4 5 5 6 789 10 111 Rare Earth 1 2 3 456 10 1112 13 141516 17 18 Group 1 2 3 4 5 6 7 6 7 Period 789

8. Mixture A substance of two or more elements mixed together. Substances are held together by physical forces, NOT chemical. Can be easily separated.

9. MIXTURE OF CANDY TRAIL MIX

10. SALAD SALT WATER SOLUTION

11. Compound A substance made by chemically combining two or more elements. Can only be separated by chemical means NOT physical. Chemical and physical properties are different than the elements they are made from.

12. Table Salt (NaCl) Water (H2O)

13. Alkaseltzer (Sodium Bicarbonate – NaHCO3) Table Sugar (C12H22O11)

14. Physical Properties A property that can be observed, measured or changed without changing the substance itself

15. Examples of Physical Properties Odor Density Mass Volume State Color

16. Chemical Properties A property of matter that describes a substance based on its ability to change into a new substance with different properties. Poisonous Gas Explosive Powder Table Salt =+

17. Examples of ChemicalProperties Flammability Reactivity

18. Physical Change A change that affects one or more physical properties of a substance

19. Chemical Change A change that happens when two or more substances are changed into one or more new substances with different properties.

20. Evidence of Chemical Reactions Temperature Change Heat is absorbed by the substances causing the temperature to decrease Heat is released by the substances causing the temperature to increase SMOKE

21. Evidence of Chemical Reactions Fizzing When a gas is formed it may try to escape causing bubbles

22. Evidence of Chemical Reactions Color Change This is evidence of a chemical reaction only when the other properties have also changed. Chemical Change Not a Chemical Change

23. Evidence of Chemical Reactions Precipitate Formed Precipitate is a solid substance formed when liquids are combined

24. Evidence of Chemical Reactions Light When a new substance is formed light energy can be produced.

25. Know Chemistry Vocabulary #5 1.Oxidation - The combination of a substance with oxygen and will form rust or tarnish. 2.Substance - that of which a thing consists; physical matter or material 3. Chemistry – The scientific study of the structure, properties, and reactions of the chemical elements and the compounds they form. 4. Chemist - A scientist specializing in chemistry. 5. Energy – The ability to do work.

26. Frying an egg

27. Chemical Change

28. Red paint + Yellow paint = Orange

29. Physical change

30. Effervescent tablets bubbling

31. Chemical Change

32. Melting butter

33. Physical Change

34. Bending a paper clip

35. Physical Change

36. Sanding wood

37. Physical Change

38. Copper tarnishing (notice green on 2 nd coin)

39. Chemical Change

40. Baking a Cake

41. Chemical Change

42. Explosion!

44. Mixture of apples & watermelon

45. Physical Change

46. Eating & Digesting Food

47. Chemical Change

48. Can being Crushed

49. Physical Change