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Physical and Chemical

Physical and Chemical. Physical Properties. Properties that are used to observe or describe a specific type of matter. Texture, color, luster, odor, solubility, polarity, boiling point, density, melting point!. Chemical Properties.

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Physical and Chemical

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  1. Physical and Chemical

  2. Physical Properties • Properties that are used to observe or describe a specific type of matter. • Texture, color, luster, odor, solubility, polarity, boiling point, density, melting point!

  3. Chemical Properties • The potential of a specific substance to undergo a chemical reaction (eg…stability and likeliness to change!) • Location on the periodic table can help us predict the chemical properties of an element! • Which elements are very reactive (unstable)? • Which elements are not reactive (stable)?

  4. Is this a physical or chemical property? • Oil floats on top of vinegar in a salad dressing mixture. • When the metal on a bike is left outside it rusts easily. • Distillation works because alcohol boils at a lower temperature than water. • Cleaning products with ammonia have a distinct smell.

  5. Changes in matter • The appearance of matter can change. • Physical changes: change the appearance of matter without altering its chemical composition. • Chemical changes: change in the appearance of matter that leads to a change in chemical composition.

  6. Examples Physical Change Chemical Change Sublimation of dry ice • Oxidation of copper on the Statue of Liberty

  7. The cycling of materials through our environment involves both physical and chemical changes. • What type of changes occur in the water cycle? • What type of changes occur in the carbon cycle? • How are humans disrupting these cycles?

  8. Water Cycle

  9. Carbon Cycle

  10. Themes: • Which chemical theme connects best to what we learned today? Why? • What other theme(s) might apply? How might they relate?

  11. Bunsen Burner Safety • Always make sure gas jets are off until you are ready. • Keep hair pulled back. • Check tube for leaks and secure to burner. Do not touch burner once its hot! • If burn gets out of control, turn the gas jet off and it will go out!!!

  12. Physical Chemical Changes Lab Goals: 1) Practice using a Bunsen burner. 2) Identify reactions as either physical or chemical changes. 3) Develop a list of “clues” about whether something is a chemical change!

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