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Physical and Chemical Properties and Changes

Physical and Chemical Properties and Changes. Physical Properties. Characteristics of a material that you can observe without changing the substances that make up the material A PHYSICAL DESCRIPTION. Example. What are the physical properties of a pumpkin? (Physically Describe the Pumpkin)

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Physical and Chemical Properties and Changes

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  1. Physical and Chemical Properties and Changes

  2. Physical Properties • Characteristics of a material that you can observe without changing the substances that make up the material • A PHYSICAL DESCRIPTION

  3. Example • What are the physical properties of a pumpkin? (Physically Describe the Pumpkin) • Color – Orange • Shape – Round • Odor – Smell it • Taste – Yum • Texture - Touch • Mass – Weigh it • Dimensions – Measure it • Density – Mass/Volume

  4. Let’s Ponder!!!! • If a physical property is a physical description of an object, what is a physical change

  5. Physical Change • A change in the: 1. SIZE 2. SHAPE 3. STATE OF MATTER • Although the physical characteristics of the substance have changed, chemically it is still the same substance

  6. Example • H2O Solid Gas Liquid It is all still H2O

  7. Example: • Paper Demonstration • Salt Water Demonstration

  8. Chemical Properties • A characteristic of a substance that indicates whether it can undergo a specific chemical change

  9. In English Please!!!! • Properties that can alter or change matter into something different • Examples: 1. Flammability 2. Explosive 3. Light Sensitive

  10. Chemical Change • A change of one substance in a material to a different substance or the creation of an additional substance

  11. Example: • Nail + Water • Nail is made of iron (physical property) • Iron when exposed to water and oxygen oxidizes (chemical property) • This means it rusts!!!! • Your nail is now iron oxide

  12. Demonstration • Vinegar and Baking Soda • Exploding Balloon

  13. Evidence of Chemical Changes • Fire/Burning • Bubbling/Gas production • Temperature Change without heating/cooling • Change in Color • Change in Odor • Forms a precipitate

  14. Conclusion • Matter can undergo physical and/or chemical changes • Physical Changes alter the physical make up of the matter • Chemical Change changes or creates a new substance • Physical Property – Physical description • Chemical Property – Properties that determine how a substance behaves

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