1. Mixtures

2. What Is A Mixture? A mixture is the physical combination of 2 or more substances It is important to understand that a mixture is not chemically combined

3. www.brainybetty.com3 A mixture is a combination of two or more substances where there is no chemical combination or reaction.

4. How Do Mixtures Form? Mixtures form by physically “junking” 2 or more substances together Remember no chemical change is occurring The formation of a mixture is not a result of lowering energy

5. www.brainybetty.com5 Mixtures combine physically in no specific proportions. They just mix.

6. www.brainybetty.com6 Solids, liquids and gases can be combined to create a mixture.

7. www.brainybetty.com7 When you create a mixture, there are no new substances formed. Each part of a mixture keeps its own properties.

8. Mixtures Mixtures can be separated by physical means such as filtration, distillation, sifting, and chromatography

9. www.brainybetty.com9 You can separate a simple mixture by physical means. No chemical reaction is needed.

10. Mixtures can be divided into 2 groups Homogenous mixtures Heterogeneous mixtures

11. www.brainybetty.com11 Mixtures can be heterogeneous or homogeneous.

12. What Is a Homogenous Mixture? A homogeneous mixture is a mixture that is evenly distributed Homogeneous mixtures are commonly called solutions. Solution = Solute + Solvent Solute: “stuff” being dissolved Solvent: “stuff” doing the dissolving The solvent is present in greater quantity The solute is present in the lesser quantity –Ex: Salt water: Salt=solute, Water=solvent

13. www.brainybetty.com13 Homogeneous mixtures are those where the materials are evenly distributed throughout. Homogenized milk is an example.

14. www.brainybetty.com14 You make a mixture by adding at least one material to another. When you add material to a gas or liquid, the material you add is called the solute and the material you are adding to is called the solvent.

15. What Is a Heterogeneous Mixture? A heterogeneous mixture is a mixture that is unevenly distributed. Examples: Iced tea: The ice is floating at the top and therefore is not evenly distributed throughout the tea Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore, the mixture is unevenly distributed

16. www.brainybetty.com16 Heterogeneous mixtures are those where the substances are not distributed evenly. They usually involve a mixture of a solid in a solid. A mixture of stones in soil is an example of a heterogeneous mixture.

17. www.brainybetty.com17 Mixtures can be classified into three types: suspension, colloidal and solution. Some liquid mixtures are solutions.

18. www.brainybetty.com18 Solutions are homogeneous mixtures that consist of microscopic particles and evenly spread out molecules.

19. www.brainybetty.com19 Suspension mixtures have larger particles and are heterogeneous. Most mixtures are suspension mixtures. Italian salad dressing is a good example.

20. www.brainybetty.com20 Colloidal mixtures fall between suspension and solution mixtures. The ingredients in colloidal mixtures are smaller and usually homogeneous.

21. How Are Mixtures Important To My Life? We encounter mixtures everywhere in our lives Where would you be without: –Ice cream –Kool-aid –Shampoo –Soup –Milk –Orange juice

22. Mixtures Lab CClick on the mixture lab link above to explore methods to separate mixtures. Name three ways mixtures can be separated. www.brainybetty.com22

23. Method of SeparationHow it works: Magnet When placing a magnet within a mixture containing iron, the magnet attracts the iron but not the other substances. Filtering (filtration) When a mixture of liquid (and anything dissolved in the liquid) with large solid particles is poured over filter paper, the water (and anything dissolved in the liquid) will pass through. The large solid particles will not and will remain on the sheet of filter paper. Evaporation When a solution is heated, the solvent will evaporate, while the solute will remain in the container. Chromatography This is done by placing paper (marked with specialized ink) within a container of a shallow layer of solvent (for example, water). As the solvent travels up the paper, it meets the color mixture (specialized ink) which also travels up the paper with the solvent. This allows the colors to separate. Sifting To separate particles according to size, or shape, or the property that makes them different. www.brainybetty.com23

24. Mixture Focus Pick up your CPS remote. Type in the term: Element, Compound, or Mixture for the correct answer to the slide that follow. www.brainybetty.com24

25. 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.

26. Element, Compound, or Mixture? Rocks

27. Element, Compound, or Mixture? Rocks

28. Element, Compound, or Mixture? Copper

29. Element, Compound, or Mixture? Copper

30. Element, Compound, or Mixture? Jelly Beans

31. Element, Compound, or Mixture? Jelly Beans

32. Element, Compound, or Mixture? Table Sugar

33. Element, Compound, or Mixture? Table Sugar

34. Element, Compound, or Mixture? Diamond

35. Element, Compound, or Mixture? Diamond

36. Element, Compound, or Mixture? Tea

37. Element, Compound, or Mixture? Tea

38. Element, Compound, or Mixture? Salt

39. Element, Compound, or Mixture? Salt

40. Element, Compound, or Mixture? Neon Gas

41. Element, Compound, or Mixture? Neon Gas

42. Element, Compound, or Mixture? Salad

43. Element, Compound, or Mixture? Salad

44. Element, Compound, or Mixture? Pure Water

45. Element, Compound, or Mixture? Pure Water

46. Element, Compound, or Mixture? Aluminum

47. Element, Compound, or Mixture? Aluminum

48. Element, Compound, or Mixture? Lemonade

49. Element, Compound, or Mixture? Lemonade

50. Element, Compound, or Mixture? Silver

51. Element, Compound, or Mixture? Silver

52. Element, Compound, or Mixture? Sand

53. Element, Compound, or Mixture? Sand

54. www.middleschoolscience.comwww.middleschoolscience.com 2009 Classifying Matter: Elements, Compounds, and Mixtures Review

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

56. Elements pure substance that cannot be separated into simpler substance by physical or chemical means.

57. 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

58. 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 retains its properties in the mixture They can be separated physically Chem4kids.com

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

60. Use your class notes to complete the chart below Classifying Matter Matter Pure SubstancesMixtures ElementsCompounds HomogeneousHeterogeneous Fe, OH 2 O, CO 2 milk, tea Rocky Road ice cream, muddy water

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