What’s the MATTER: Classify Changes of Matter - PowerPoint PPT Presentation

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What’s the MATTER: Classify Changes of Matter

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  1. What’s the MATTER:Classify Changes of Matter

  2. Matter, Classify Changes of Matter At the conclusion of our time together, you should be able to: Characterize various changes of matter Recognize that a change of state in matter is a physical change

  3. Interesting Signs:

  4. Physical Change Physical • A change in matter from one form to another without changing its chemical properties • (most can be reversed) • No change in atoms/molecules

  5. Physical Change • Examples = • Change in state or phase change • Dissolving • Compressing • Light emission/absorption • Electrons passing through metals

  6. Physical Change More Examples = • boiling of a liquid • melting of a solid • dissolving a solid in a liquid to give a homogeneous mixture • making a solution

  7. 2 1 Chemical Change Chemical • Bonds are made / broken • Change in oxidation states Li +1 Cl-1 Cl-1

  8. Examples of Chemical Change • Chemical change or chemical reaction — transformation of one or more atoms or molecules into one or more different molecules. • Burning hydrogen (H2) in oxygen (O2) gives H2O.

  9. Sure Signs of a Chemical Change“Chemists Get Practice Trying Labs” • Color Change • Gas Produced (not from boiling!) • Precipitate – a solid formed by mixing two liquids together • Temperature Change • Light

  10. Will This be on the Test????

  11. Remember the Law of Conservation of Mass • In a physical change or a chemical reaction, mass is neither created or destroyed (Antoine Lavoisier)

  12. Matter, Classify Changes of Matter Let’s see if you can: Characterize various changes of matter Recognize that a change of state in matter is a physical change

  13. Physical vs. Chemical Change • physical • chemical • physical • physical • chemical • Examples: • melting • flame produced • paper cut • dissolving salt in water • tarnishes in air

  14. Physical vs. Chemical Change • chemical • physical • chemical • physical • physical • Examples: • rusting iron • mixing mud and water • burning a log • freezing water • grinding spices

  15. A difference between physical change and chemical change is that • chemical change involves energy while physical change does not. • physical change involves energy while chemical change does not. • different kinds of molecules are present after a physical change but not after a chemical change. • different kinds of molecules are present after a chemical change but not after a physical change

  16. In making a pizza, which process involves a chemical change? Mixing spices for the sauce Slicing pepperoni for the topping Spreading cheese on the pizza Baking the dough to form the crust

  17. All You Really Need To Know You Can Learn From Noah's Ark • Remember that the ark was built by amateurs; the Titanic was built by professionals. • Remember that woodpeckers inside are a larger threat than the storm outside.

  18. What’s the MATTER, Properties of Matter

  19. Matter, Properties of MatterAt the conclusion of our time together, you should be able to: Explain the difference between the extensive and intensive properties and other types of properties Distinguish between a physical property and chemical property

  20. Too late to learn this stuff???

  21. The Nature of Matter Chemists are interested in the nature of matter and how this is related to its atoms and molecules. Gold Mercury

  22. Chemistry & Matter • We can explore the MACROSCOPIC world — what we can see — • to understand the PARTICULATE worlds we cannot see. • We write SYMBOLS to describe these worlds.

  23. A Chemist’s View Macroscopic 2 H2(g) + O2 (g) --> 2 H2O(g) Symbolic Particulate

  24. Septic Tank Humor

  25. Properties of Matter • 2 Types: • Extensive – depend on the amount of the sample • Always involves a number with unit • Examples = volume mass length

  26. Properties of Matter (cont.) • Intensive – does not depend on the amount of the sample • Usually does not involve a number • Examples = density melting, boiling point malleability ductility color odor

  27. Properties • Every substance has a unique set of properties (characteristics that identify that substance) • Physical Properties- • Properties that can be measured without changing the identity and composition of the substance

  28. Physical Property Examples- • Color • Odor • Density • Melting Point • Boiling Point • Hardness • Solubility

  29. What Do You Call a Boomerang That Doesn't Work? A Stick

  30. List Some Physical Properties of: Graphite — this layer structure of carbon atoms reflects its physical properties.

  31. Chemical Properties • Properties that describe the way a substance may change to form other substances • Only observed when a chemical reaction takes place

  32. Chemical Property Examples • Combustible • Reactive with water or acid • Flammable • Corrosive • Decomposes in air

  33. Do I Have to Learn this Stuff???

  34. Physical vs. Chemical Properties • Physical Properties- • Properties that can be measured without changing the identity and composition of the substance • Chemical Properties- • Properties that can be measured by changing the identity and composition of the substance

  35. Matter, Properties of MatterLet’s see if you can: Explain the difference between the extensive and intensive properties and other types of properties Distinguish between a physical property and chemical property

  36. Design a Hypothesis

  37. Properties of Matter • 2 Types: • Extensive – • depends on the amount of the sample • Intensive – • does not depend on the amount of the sample

  38. Physical vs. Chemical Properties • Physical Properties- • Properties that can be measured without changing the identity and composition of the substance • Chemical Properties- • Properties that can be measured by changing the identity and composition of the substance

  39. Physical vs. Chemical Property • physical • chemical • physical • physical • chemical • Examples: • melts at 55oF • flammable • will tear easily • will dissolve in water • will tarnish

  40. Physical vs. Chemical Properties • chemical • physical • chemical • physical • physical • Examples: • will rust • mixture can be separated by boiling • burns • freezes at -20oC • can be crushed

  41. Familiar Saying A rotating lithoidal fragment never accrues lichen. A rolling stone gathers no moss!!

  42. The End!!!