Evidence of Chemical Change

10/20/11

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 …..

IV: Connections

Make the following T-Chart

Physical Change Chemical Change

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

V: Exit