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10-21-11 In your “Starter” section: Make a list of the “signs” that a chemical
reaction has occurred. 1. Gas Formation2. Solid formation (precipitate)3. Temperature Change4. Color Change5. Light is given off6. Change in smell (or taste)
I: Starter
Decide whether the following statements are physical changes or
chemical changes. A bicycle left out in the rain begins to rust.
Chemical A match burns, leaving only a charred stick of wood.
Chemical A copper wire is cut into five smaller pieces.
Physical An ice cube melts.
Physical Gasoline burns in a car engine.
Chemical
II: Practice
A spoonful of sugar is dissolved in a cup of coffeePhysical
A silver knife and fork tarnish when they are exposed to air for several weeks.Chemical
Leaves of a maple tree turn bright red as winter approaches. Chemical
Water is heated and changed to steam. Physical
Food is digested in your stomach.Chemical
III: Application
Make a visual display that divides your poster into 4 categories and includes :•The definition for Chemical Change the middle of the paper•Appropriate labels for each of the 4 categories• Color Change• Temperature Change• Solid Precipitate Forms• Gas Bubbles
•Graphic and written explanation demonstrating before and after for each of the 4 types of Chemical Changes
Color Change Temperature Change
Solid Precipitate
Gas Bubbles
Don’t forget explanation of change being
shown
Evidence of Change
by Insert First & Last Name
Chemical Change – Any change that results in the
formation of new chemical substances
Before After
Illustration
Illustration
Explanation …..
Before After
Illustration
Illustration
Explanation …..
Before After
Illustration
Illustration
Explanation …..
Before After
Illustration
Illustration
Explanation …..