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http://www.youtube.com/watch?feature=player_embedded&v=xIkTOm-LttM

JRL #9/18 How would you describe a piece of wood before and after it is burned?. http://www.youtube.com/watch?feature=player_embedded&v=xIkTOm-LttM. Open INB to p.___ ___

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  1. JRL #9/18 How would you describe a piece of wood before and after it is burned? • http://www.youtube.com/watch?feature=player_embedded&v=xIkTOm-LttM

  2. Open INB to p.______ • Open textbook to Sec. 2-3 “Chemical Properties” on p. 50

  3. A. Chemical Properties • Chemical properties describe matter based on its ability to change into new matter that has different properties.

  4. For example, when wood is burned, the ash and smoke created have very different properties than the original piece of wood had.

  5. 2) Chemical properties are not easy to observe. a) For ex, you can see that wood is flammable only while it is burning.

  6. 3). But, a substance ALWAYS has chemical properties. • For example, a piece of wood is flammable even when it is not burning.

  7. EXAMPLES OF CHEMICAL PROPERTIES • FLAMMABILITY is the ability of a substance to burn • examples: wood, paper,… 2) NONFLAMMABILITY is the inability of a substance to burn b). Examples: ash, smoke, water

  8. 3) REACTIVITY: is the ability of two or more substances to combine and form one or more new substances.

  9. C. TYPES of REACTIVITY • Reactivity with Oxygen: • Rusting: iron reacts with oxygen to form iron oxide (rust)

  10. Corrosiveness:the ability of a metal to react with oxygen, causing it to wear away at the surface * For example, silver tarnishesand copper turns green.

  11. (c) COMBUSTIBILITY: the ability of a fuel to react with oxygen to produce light and heat. • For example, gasoline and natural gas are combustible.

  12. (2) ACIDITY: reactivity with acids, resulting in a bitter taste and corrosionof a substance

  13. (3) Reactivity With Water : the ability to react with water • For ex, lithium reacts explosively with water so it is stored in oil to keep it separate from water and air in the atmosphere • http://www.youtube.com/watch?v=w7FCR9Ja6yM

  14. D. EXAMPLES of NONREACTIVITY • Chromium does not react with oxygen to form rust.

  15. (b). Pure gold is noncorrosive; it does not react with water, air, or acids which keeps it bright yellow

  16. E. Characteristic Properties • are the most useful properties in identifying and classifying a substance. • are always the same no matter what the size of the sample. • Can be physicalproperties (ie, density and solubility) • Can be chemicalproperties (ie, flammability and reactivity).

  17. (c) Stainless steel does not react with acids in foods like copper and aluminum.

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