1. Classifying Matter: Elements, Compounds, and Mixtures

3. Pure Substances A sample of matter that has definite chemical and physical properties.

4. The building blocks of Matter Consists of Protons (+), Electrons (-), and Neutrons (N).

5. Consists of only one kind of atom, Cannot be broken down into a simpler type of matter by either physical or chemical means Can exist as either atoms or molecules.

6. A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. In the animation above, two nitrogen atoms (N + N = N2) make one Nitrogen molecule.

7. Compounds Pure substance composed of two or more different elements joined by chemical bonds. Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically

8. Chemical Formulas ElementsCompounds O 2 Co Na N 2 **One capital letter! CO 2 NaCl C 6 H 12 O 6 CO **More than 1 capital letter!

9. Mixtures A combination of two or more pure substances that are not chemically combined. substances held together by physical forces, not chemical No chemical change takes place Each item keeps its properties in the mixture They can be separated physically Can be homogeneous (same throughout) or heterogeneous (different throughout) Chem4kids.com

10. Mixtures vs. Compounds http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

11. Solutions are groups of molecules that are mixed up in a completely even distribution. Uniform Distribution. Example: Sugar and Water Images are from http://www.chem4kids.com

12. The substance to be dissolved. The one doing the dissolving. Images are from http://www.chem4kids.com

14. They are substances held together by physical forces, not chemical. Can be separated physically. Solutions are also mixtures. The substances are not uniformly mixed. Example: Sand in a glass of water. Images are from http://www.chem4kids.com

15. Are heterogeneous mixtures consisting of parts that are visible to the naked eye. Example: the ingredients in salad dressing Substances will settle over time.

16. Particle sizes are in between the size of particles found in solutions and suspensions. Can be mixed and remain evenly distributed without settling out.

17. Can you identify the following? You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.

18. Element, Compound, or Mixture? Rocks

19. Element, Compound, or Mixture? Rocks

20. Element, Compound, or Mixture? Copper

21. Element, Compound, or Mixture? Copper

22. Element, Compound, or Mixture? Jelly Beans

23. Element, Compound, or Mixture? Jelly Beans

24. Element, Compound, or Mixture? Table Sugar

25. Element, Compound, or Mixture? Table Sugar

26. Element, Compound, or Mixture? Diamond

27. Element, Compound, or Mixture? Diamond

28. Element, Compound, or Mixture? Tea

29. Element, Compound, or Mixture? Tea

30. Element, Compound, or Mixture? Salt

31. Element, Compound, or Mixture? Salt

32. Element, Compound, or Mixture? Neon Gas

33. Element, Compound, or Mixture? Neon Gas

34. Element, Compound, or Mixture? Salad

35. Element, Compound, or Mixture? Salad

36. Element, Compound, or Mixture? Pure Water

37. Element, Compound, or Mixture? Pure Water

38. Element, Compound, or Mixture? Aluminum

39. Element, Compound, or Mixture? Aluminum

40. Element, Compound, or Mixture? Lemonade

41. Element, Compound, or Mixture? Lemonade

42. Element, Compound, or Mixture? Silver

43. Element, Compound, or Mixture? Silver

44. Element, Compound, or Mixture? Sand

45. Element, Compound, or Mixture? Sand

46. Notes Detailed notes are located at: http://www.middleschoolscience.com/elements-compounds- mixtures-notes-isn.pdf Flow Chart: http://www.middleschoolscience.com/matter-flow-chart- isn.pdf