1. Evidence of Chemical Change
10/20/11

2. I: Starter 10-21-11 In your “Starter” section:
Make a list of the “signs” that a chemical reaction has occurred.
Gas Formation
Solid formation (precipitate)
Temperature Change
Color Change
Light is given off
Change in smell (or taste)

3. II: Practice
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.
A copper wire is cut into five smaller pieces.
Physical
An ice cube melts.
Gasoline burns in a car engine.

4. Leaves of a maple tree turn bright red as winter approaches.
A spoonful of sugar is dissolved in a cup of coffee
Physical
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.
Water is heated and changed to steam.
Food is digested in your stomach.

5. 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

6. Evidence of Change Color Change Temperature Change Before After Before
Illustration
Illustration
Illustration
Illustration
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
Explanation …..
Explanation …..
Solid Precipitate
Gas Bubbles
Before
After
Before
After
Illustration
Illustration
Illustration
Illustration
Explanation …..
Explanation …..

7. IV: Connections Make the following T-Chart Physical Change
Chemical Change

8. V: Exit
Write a paragraph summarizing today’s activity. Please make it at least 3-4 well written sentences!