1 / 38

Concept Attainment Exercise

Concept Attainment Exercise. Diagrams that are examples and non-examples of a specific concept will be shown Make your own observations and try to notice what concept surrounds the examples Keep your observations to yourself, we will share them with each other later

vanna-clayton
Download Presentation

Concept Attainment Exercise

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Concept Attainment Exercise • Diagrams that are examples and non-examples of a specific concept will be shown • Make your own observations and try to notice what concept surrounds the examples • Keep your observations to yourself, we will share them with each other later • Test diagrams will follow to see if you have made the right observations

  2. Example

  3. Non-example

  4. Example

  5. Non-example

  6. Example

  7. Non-example

  8. Example

  9. Non-example

  10. Example

  11. Non-example

  12. Recap Examples • Sand in water • Quartz crystal • Cigarette smoke • Brass trumpet • Pepper Non-examples • Distilled water • Diamond crystal • Neon gas in tube • Silver trumpet • Salt

  13. What do you think? • What do all the examples have in common? • What do all the non-examples have in common?

  14. Tester #1

  15. Tester #2

  16. Tester #3

  17. Tester #4

  18. Tester #5

  19. Guess the concept! (?) • All the examples showed pictures of mixtures • sand in water, quartz crystal, cigarette smoke, brass trumpet, pepper, milk, oil in water, salt water, honey • All the non-examples were pictures of puresubstances • distilled water, diamond, neon gas, silver trumpet, salt, pencil lead

  20. MIXTURE PURE SUBSTANCE yes no yes no Is the composition uniform? Can it be chemically decomposed? Colloids Suspensions Matter Flowchart MATTER yes no Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element

  21. Pure Substance • A pure substance contains only one kind of molecule. • That molecule can be either an element or a compound. • Ex. Water is a compound of H-O-H. • Ex. A diamond is an element molecule of C-C-C (n) • It can’t be separated by physical means Element Compound

  22. Pure Substance: Elements • Elements are composed of identical atoms • EX: copper wire, aluminum foil

  23. Pure Substance: Compounds • Compounds are made of two or more different elements in a fixed proportion • EX: Salt (NaCl)

  24. Element or Compound? • A clear, colourless liquid that can be chemically split into two gases – each with different properties • A yellow solid that always has the same properties and cannot be broken down chemically • A colourless gas that burns in oxygen to produce carbon dioxide and water

  25. Mixtures • Variable combination of 2 or more pure substances (or other mixtures). Heterogeneous Homogeneous

  26. Mixtures: Homogenous • A homogeneous mixture is a mixture with only one visible phase (dissolved substance in solvent)

  27. Mixtures: Heterogeneous • Solutions • homogeneous • small-sized particles • No Tyndall effect (do not scatter light) • particles don’t settle • EX: tea

  28. Mixtures: Homogeneous • Some metals that we use every day exist because they are mixtures. • Bronze = tin + copper • Brass = copper + zinc • These metal mixtures are called ALLOYS

  29. Mixtures: Heterogeneous • Colloids • homogeneous • medium-sized particles • Tyndall effect (do scatter light) • particles don’t settle • EX: milk

  30. Mixtures: Heterogenous • A heterogeneous mixture is a mixture with two or morevisible phases

  31. Mixtures: Heterogeneous • Suspension • heterogeneous • large particles • Tyndall effect (do scatter light) • particles settle • EX: fresh-squeezed lemonade

  32. Mixtures & the Tyndall Effect • scattering of light by particles • a way to tell the difference between solutions and colloids and suspensions

  33. Mixtures & the Tyndall Effect

  34. Mixtures & the Tyndall Effect Laser light passes through Laser light passes through Laser light does NOT pass No scattering with scattering through – most/all light is scattered

  35. More Terms…

  36. Atoms • Each Element is made of one kind of atom. • An atom is the smallest indivisible particle of matter

  37. Molecule • A molecule is a combination of two or moreatoms Oxygen Hydrogen Water

More Related