Sept. 24 - Physical and Chemical Changes

Congratulations on completing the quiz today on density!  Here is the new material for today:

Chapters 5.2 and 5.3, Physical and Chemical Changes

Learning Goals: Understand the difference between physical and chemical changes.

Success Criteria: Be able to distinguish between physical and chemical changes.

We completed this handout today:

• Physical and Chemical Changes

We tried to distinguish whether or not the following are physical or chemical changes.

Here are 5 clues that will help you.

• Colour changes.
• Bubbles form in a liquid.
• A solid forms when two liquids are mixed, called a precipitate.
• Heat or light is released.
• Difficult to reverse.

Remember, these are just clues.  The only way to really determine if a chemical change has occured is to find out if the particles have changed forming a new substance.

Cutting a carrot.

A carrot going bad.

Boiling an egg.

Here's the egg after it's boiled.

Making Jello.

Yummy Jello!

Boiling water.

Firewood burning.

Dynamite exploding.

Baking a cake.

Ice freezing on a pond.

Bending a paperclip.

Homework: 

• Read this handout and prepare for tomorrow's lab.
• Physical and Chemical Changes LAB