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Objectives

Objectives . To be able to: Explore different ways that materials can be mixed together to make new materials Test materials to see what kind of mixtures they are. Drill. Classify the mixtures as homogeneous or heterogeneous: Salt water Concrete. Homework. None. The Chapter Challenge.

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Objectives

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  1. Objectives • To be able to: • Explore different ways that materials can be mixed together to make new materials • Test materials to see what kind of mixtures they are

  2. Drill • Classify the mixtures as homogeneous or heterogeneous: • Salt water • Concrete

  3. Homework • None

  4. The Chapter Challenge • Create a story line, produce and demonstrate special effects on the chemistry you have learned in the following unit.

  5. Movie Special Effects Activity 3 Solutions, Suspensions and Colloids

  6. What do you see? Look at the picture on page 120 in your textbook and write down what you see. Be prepared to discuss what you see with the class.

  7. Activity 3What do You Think? • One way to get different types of materials is to just mix them together. Lots of different things can happen when materials are mixed. You can get some good food or you can get dynamite. Each kind of mixture has its own characteristics. Taking mixtures apart is a different story • Is it easier to separate milk from coffee or milk from a bowl of cereal? Why?

  8. Activity 3Investigate • Textbook • pp 120 - 121

  9. Activity 3Chem Talk • Classifying Matter • Pure substance • One kind of particle throughout • Example: gold, water • Two types of pure substances • Element • One atom throughout • Example: copper, lead, chlorine • Compound • Combination of two or more atoms • Example: water, sugar, carbon dioxide

  10. Activity 3Chem Talk • Classifying Matter • Mixtures • More than one kind of particle throughout • Two types of mixtures • Homogeneous mixture • Totally uniform mixture • Example: Milk • Heterogeneous mixture • Not totally uniform • Example: Chocolate chip ice cream

  11. Activity 3Chem Talk • Classifying Matter • Homogeneous Mixtures • Solutions • When a solute is completely dissolved into a solvent • Mixture passes through a filter • Example: Kool-aid, Salt water • Colloids • Dispersion of particles suspended in a mixture • Light is scattered by a colloid (Tyndall Effect) • Mixture passes through a filter

  12. Checking up • In your own words, describe how you would distinguish among a solution, a colloid and a suspension • What is the Tyndall Effect?

  13. Activity 3What Do You Think Now? • At the beginning of the Activity you were asked • Is it easier to separate milk from coffee or from cereal? • Use what you know to develop a procedure to separate a mixture of salt, sand and iron filings. Think about the following: • Which Item is Magnetic and How would you remove it from the mixture? • What will dissolve in water and pass through a filter? • What item is not magnetic and will not dissolve in water?

  14. Activity 3Chem Essential Questions • What does it mean? • Macro • Describe what you observed after preparing a solution, a suspension and a colloid

  15. Activity 3Chem Essential Questions • What does it mean? • Nano • In words, describe what is happening to the particles in a solution, a suspension and a colloid

  16. Activity 3Chem Essential Questions • What does it mean? • Symbolic • Draw a picture to show how and why the Tyndall effect appears in a colloid and not a solution or a suspension

  17. Activity 3Chem Essential Questions • How do you know? • Look back at your data table and determine the visual clue that will help you distinguish solutions, suspensions and colloids

  18. Activity 3Chem Essential Questions • Why do you believe? • On some days, it is possible to see rays of light from the sun distinctly coming through the breaks in the clouds. What atmospheric difference allows you to see the light rays on some days and not on others?

  19. Activity 3Chem Essential Questions • Why should you care? • You will be writing a movie scene for your challenge in this unit. How could you use lasers in the video and make them visible to the camera?

  20. Reflecting on the Activity and the Chapter Challenge Page 124

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