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Physical and Chemical Properties of Matter

Physical and Chemical Properties of Matter. Tuesday 1/7/14. Please take out your lab book Pencil Warm up: in your lab book answer the following questions: What is a physical property of matter? Give 4 examples of a physical property What do you think a chemical property of matter would be?.

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Physical and Chemical Properties of Matter

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  1. Physical and Chemical Properties of Matter

  2. Tuesday 1/7/14 • Please take out your lab book • Pencil • Warm up: in your lab book answer the following questions: • What is a physical property of matter? • Give 4 examples of a physical property • What do you think a chemical property of matter would be?

  3. So What is a Chemical Property? • A Chemical property is a characteristic of a substance that can only be observed by changing it into a different substance.

  4. Chemical Properties • Examples of chemical properties include: • The ability to burn • Ability to tarnish • Ability to rust • Ability to decompose • Ability to react with other chemicals • Instability • Ability to do acid/base reactions

  5. Determine if the following is Chemical or a Physical……. • Glass Breaking • Rusting Bicycle • Boiling Water • Spoiling Food • Mixing Lemonade Powder in Water • Corroding Metal • Bleaching Your Hair • Fireworks Exploding • Squeezing Oranges of Make OJ • Frying an Egg • Melting Wax

  6. Physical and Chemical Changes

  7. Physical Change • A Physical change is a change in a substance that does not change what the substance is.

  8. Physical Change - examples • Examples of Physical Change include: • Change in shape • Change in size • Change in phase • Melting (solid to liquid) • Boiling (liquid to gas) • Evaporation (liquid to gas) • Condensation (gas to liquid) • Freezing (liquid to solid) • Sublimation (solid to gas) • Deposition (gas to solid)

  9. Physical Change • Physical changes might be caused by: • Grinding • Cutting • Crushing • Bending • Breaking • Heating/cooling • (change in phase) • Squishing

  10. Physical Change • Evidence that a physical change has occurred might include: • Change in shape • Change in form • Change in size • Change in phase (This is always a physical change!) • Physical changes are usually reversible

  11. Physical Change • What could you do to these items to cause a physical change to occur?

  12. Chemical Change • A chemical change is a change in which a substance is changed into a different substance. (You’ve changed what it is.)

  13. Chemical Change • Examples of chemical changes include: • Burning • Rusting • Tarnishing • Decomposing • Polymerization

  14. Chemical Change • Chemical changes occur when a Chemical Reaction causes bonds between atoms to break or to form.

  15. Chemical Change: Evidence • Evidence that a Chemical Change has occurred might include: • A color change • An odor change • Formation of a precipitate (you mix two liquids and make a solid) • Gas is formed (bubbles) • Changes in physical properties.

  16. Chemical Change • During a chemical change energy can be released in the form of: • Heat • Light

  17. Chemical Change - Heat • A chemical reaction that releases energy in the form of heat is called exothermic. • Heat comes OUT • Exo = out • Thermic = heat • It will feel HOT!!!

  18. Chemical Change - Heat • A chemical reaction that absorbs energy in the form of heat is called endothermic. • Heat goes IN • Endo = in • Thermic = heat • It will feel COLD!!

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