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Physical and Chemical Changes

Physical and Chemical Changes. Matter. Anything that has mass and takes up space (has volume ). Matter. Can be described as Physical property – description of substance. Ie. Colour, smell, taste, density.

shelley-greer
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Physical and Chemical Changes

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  1. Physical and Chemical Changes

  2. Matter • Anything that has mass and takes up space (has volume).

  3. Matter • Can be described as • Physical property – description of substance. Ie. Colour, smell, taste, density. • Chemical property – Describes how a substance reacts when mixed with other substances. ie. Gas burns in heat and oxygen.

  4. Physical Change • A change that does not produce a new substance. • Usually reversible • e.g. melting ice, dissolving salt

  5. Chemical Change • A reaction takes place creating a new substance. • Usually hard or impossible to reverse. • Ex. Cooking an egg

  6. e.g. Gummy Bear Inferno Demo Sugar + O2 Carbon Dioxide + H2O In a chemical change, there are clues that a change occurred. Can you name them?

  7. There are 5 clues that a chemical change may have occurred… 1. A new colour appears.

  8. 2. Heat or Light is given off.

  9. 3. Bubbles of Gas are formed.

  10. 4. A new solid material forms (precipitate).

  11. 5. A new odour is made.

  12. What do you think? 1. Sugar dissolving in tea? 2. Breaking water up into hydrogen and oxygen gas? 3. Burning a log in a campfire? 4. Crushing an Aspirin? 5. Metal Rusting? 6. Lighter fluid burning? 7. An egg rotting? 8. Boiling water? 9. Test tubes in picture  ?

  13. Prepping your labs Write in BLUE or BLACK pen only Mistakes Observations usually in a table (ruler) All titles and subtitles underlined (ruler) Date and name in the upper right corner with lab partners name Analysis must be in full sentences. That means include the question in the answer

  14. Name: LP: Physical and Chemical Changes Lab Mar. 21, 2011 Purpose: To collect and use evidence to identify physical and chemical changes. Materials: See Ms. Jamieson’s ppt Procedure: See Ms. Jamieson’s ppt Observations:

  15. Procedure: Exp. 1 1. Add 2 cm of HCl to test tube 2. Add 2cm strip of Mg. 3. Dispose & Rinse test tube. Exp. 2 1. Add 3 cm of distilled water to test tube 2. Add ½ pea size scoop of CuSO4 3. Shake gently (do not put thumb on top) Exp. 3 1. Add pea size ball of steel wool to test tube used in #2 2. Shake gently (do not put thumb on top). 3. Dispose & Rinse test tube. Exp. 4 1. Add 1cm of HCl to the test tube 2. Add 2 drops of phenolthalein. 3. Slowly add drops of NaOH while shaking gently until you observe a change 4. Dispose & Rinse test tube.

  16. Analysis: 1. Classify each of the experiments as chemical or physical changes. Write a sentence to justify your decision using specific evidence you’ve observed. 2. Give one example from everyday life of a physical change. Explain how to reverse it. 3. In your own words, how would you explain the difference between a physical and chemical change to a friend?

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