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Thursday September 20, 2012

Thursday September 20, 2012. ( Categories and Properties of Matter).

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Thursday September 20, 2012

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  1. ThursdaySeptember 20, 2012 • (Categories and Properties of Matter)

  2. A _________ property of matter is one that does not change the identity of the material if it is observed or measured. Melting, freezing, evaporation, condensation, cutting, tearing and breaking are examples.By contrast, a _________ property of matter is one that changes the identity of the material if it is manipulated. Rusting, digesting, and burning are examples. Bell RingerThursday, 9-20-12 physical chemical

  3. An _________ property is a physical property of matter that does not depend on the amount of matter in a sample. For example, density is an intensive property of a substance because it does not depend on the amount of that substance that you have. Whether you have a small piece of copper or a very large chunk, copper always has a density of 8.63 g/cm3.By contrast, an _________ property is a physical property of matter that does depend on the amount of matter in a sample. It is directly proportional to the amount of material in the sample.For example, both mass and volume are extensive properties. Obviously, the larger the sample of iron you have, the greater its mass and its volume. Bell RingerThursday, 9-20-12 intensive extensive

  4. Announcements • None today

  5. Categories of Matter

  6. Determining Categories of Matter Can it be separated physically? No Yes Can it be separated chemically? No Is it evenly mixed? Yes Yes No

  7. The Least You Need to Know Physical properties of matter are those that, when manipulated, observed, or measured, do not change the chemical identity of the matter sample.

  8. Physical Property - Melting

  9. Physical Properties – Evaporation and Boiling

  10. Physical Property - Freezing

  11. Physical Property - Condensation

  12. The Least You Need to Know Chemical properties of matter are those that, when manipulated, change the chemical identity of the matter sample into new substances.

  13. Chemical Property - Rusting The element iron "rusts" when it reacts with oxygen of the air, usually in the presence of water, to form a brown substance known as iron oxide. It is a slow chemical reaction which takes place over a period of time. Rust is the common name for iron oxide.

  14. Chemical Property - Tarnishing The presence of the compound hydrogen s sulfide (H2S) in any material that silver comes into contact with is one of the prime reasons for silver tarnish. Materials like wool, rubber bands, fuels derived from fossils, a few types of paints and rubber (latex) gloves are some of the common materials that cause tarnishing of silver.. Certain foods like eggs and onions also hasten the silver tarnish process. You can therefore realize that touching silver jewelry with oily hands or after a meal could also stain your silver jewelry with tarnish. The extent and speed with which your silver jewelry tarnishes is also related to the climate and in general, high humidity would result in silver tarnishing much faster. 

  15. Chemical Property - Oxidization

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