Which of the following is a sign that a chemical reaction has occurred?

• Change in shape
• Dissolving in a liquid
• melting
• formation of a gas

Which of the following is NOT an example of a physical change?

• crumpling up paper
• sharpening a pencil
• rust
• Shrunken clothing

A change where one or more new substances are created.

• physical change
• chemical change

Fizzing, foaming, and burning are all evidence of

• physical change
• chemical change

When you break a cracker into pieces it is a...

• physical change
• chemical change

Which of these is a result of a chemical change?

• mixture
• freezing or melting
• solution
• a new substance

What form of energy is being CREATED here? There is more than one answer!

• electrical
• thermal
• mechanical
• radiant (light)

Which of the following is a sign that a physical change has occurred?

• heat being produced
• cut into smaller pieces
• bubbles forming
• light being produced

Chemical changes ____

• can't be eaten
• can be seperated
• can't be undone
• involve only two things

Which law states that matter cannot be created or destroyed during a chemical change/reaction?

• Conservation of Light
• Convervation of Thermodynamics
• Conservation of Energy
• Conservation of Mass