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Bellringer 11-7-2013

Bellringer 11-7-2013. What are the 2 most basic categories of matter? If you shine a flashlight through a glass of KoolAid and then a glass of water with a little milk mixed in, which one(s) would you see the light beam going through the glass? a. Kool-Aid b. Milky water c. Both.

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Bellringer 11-7-2013

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  1. Bellringer 11-7-2013 • What are the 2 most basic categories of matter? • If you shine a flashlight through a glass of KoolAid and then a glass of water with a little milk mixed in, which one(s) would you see the light beam going through the glass? a. Kool-Aid b. Milky water c. Both

  2. What is Matter? • It has mass and takes up space • Everything around us is matter

  3. ON A PIECE OF NOTEBOOK PAPER, MAKE THE FOLLOWING GRAPHIC ORGANIZER

  4. Physical Properties • Definition:can be observed without altering the chemical composition of a substance • Examples: color, texture, malleability, solubility, mass, volume, density Malleable: capable of being extended or shaped by beating

  5. Play Dough: Physical Properties • Color? • Texture? • Malleability? • Mass? • Solubility?

  6. Physical Properties Physical properties can be described as being intensive or extensive.

  7. Extensive Properties: • Dependent on size. • volume, mass, and length

  8. Intensive Properties: • do not change with the sample size • can be useful in identifying a substance • color, density, viscosity, temperature, solubility, and states of matter.

  9. Chemical Properties • Definition: the ability of a substance to combine with or change with other substances. • Toxicity, reactivity, flammability, radioactivity

  10. Play Dough: Chemical Properties • Toxicity • Reactivity • Flammability • Radioactivity

  11. #1 • The boiling point of a certain alcohol is 75 degrees Celsius Physical

  12. #2 • Copper forms green copper carbonate when in contact with moist air Chemical

  13. #3 • Table salt dissolves in water Physical

  14. #4 • Copper is a good conductor of heat and electricity Physical

  15. #5 • Magnesium burns brightly when ignited Chemical

  16. #6 • Iron is more dense than aluminum Physical

  17. What’s the Difference? • Matter can change • Examples: Freeze, cut, burn, etc. • 2 types of changes • Physical changes • Chemical changes

  18. Physical Changes • Definition:when the state or form of matter is changed physically or mechanically • Clue: still the same stuff • Examples: breaking, cutting, freezing, melting, etc. Ask yourself…”Can it be turned back into how it started?” Yes

  19. Chemical Change • Definition: takes place on a molecular level (reaction) and produces a new chemical substance. • Clue: new stuff, color etc. • A chemical change always involves a chemical reaction

  20. Where is the Evidence??? • Evidence of chemical change: • color change, gas production, and release of heat, light, odor, or sound. • Examples: Burning (combustion), rusting, tarnishing and fermenting

  21. ice melting P

  22. burning a chemistry book C

  23. melting iron P

  24. frying an egg C

  25. fireworks exploding in the sky C

  26. turning wood into a baseball bat P

  27. baking a cake C

  28. sharpening a pencil P

  29. sulfuric acid added to sugar C http://www.youtube.com/watch?v=nqDHwd9rG0s

  30. carving a watermelon into a creepy looking face P

  31. pouring liquid nitrogen into a bowl and watching it vaporize P

  32. Exit Ticket: • A chemist is looking to describe a chemical with a intensive property. Which of the following is an intensive property? • Mass is 6.7g • Boiling point is 500 C • Volume is 4 cm3 Label as physical or chemical: Ice melting Baking a cake Iron rusting

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