Evidence of Chemical Reactions

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

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

Is melting butter for popcorn a chemical or physical change?

• chemical
• physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A solid piece of chocolate is melted and changed to liquid form. Which property of the piece of chocolate will remain the same?

• Texture
• Temperature
  
• Shape
•  Mass

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

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

• crumpled paper
• pencil sharpening
• shrunken clothing
• rust

Tags

NGSS.MS-PS1-2

Freezing Juice?

• Physical Change
• Chemical Change

A change where one or more new substances are created.

• Physical Change 
• Chemical Change 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An unexpected change in color is a physical change.

• True

• False

Fizzing, foaming, and burning are all examples of

• Chemical change
• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Rust on an iron bar is an example of chemical change.

• True 
• False

Tags

NGSS.MS-PS1-2

What kind of properties can only be observed when a substance changes into a different substance?

• physical properties
• chemical properties

Tags

NGSS.MS-PS1-2