Question

Make a presentation that compares and contrasts physical and chemical changes. Your presentation must include the following information:

Definitions for physical and chemical change:

-At least six examples for each type of change
-At least three pictures for each type of change
-Lists of observable changes that suggest a chemical or physical change has occurred
-Methods scientists use to determine if a change was physical or chemical

Answer 1

what part is giving you trouble?

Answer 2

Physical-a reversible change that does not produce a new substance
Mixing sand and water
Melting ice
Boiling water
Ripping paper
Breaking glass
Crushing a can

Chemical-an irreversible change that can produce a new substance
Burning paper
Metal rusting
Baking a cake
Rotting bananas
Souring milk
Mixing vinegar and baking soda to produce carbon dioxide

Observations
When you put an ice cube in the sun, it begins to shrink as it melts -physical.
When you hear up water it begins to bubble which shows it is boiling-physical.
When iron is exposed to the elements, it's texture and color changes as rust forms-chemical.
When you light paper on fire, ash is created as it burns away-chemical.

Methods
If a change is physical it can be reversed but if it is chemical it cannot be reversed.

You can find pictures by looking up some of the examples