Evidences of Chemical and Physical Changes

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-PS1-2

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

Tags

NGSS.MS-PS1-4

What is the evidence of the chemical change seen here?

• Color change

• Light produced

• state change

• mixture

Tags

NGSS.MS-PS1-2

Which of the following indicates a chemical change had occurred in reaction 2 ?

• Change in temperature

• Production of fire

• Change in color

Tags

NGSS.MS-PS1-2

Which of the following are evidence of a chemical change? ​ (a)   ​ (b)   ​ (c)   ​ (d)   ​ (e)  

• Release of light

• Temperature change

• Odor change

• sudden color change

• gas given off

• ductility

• malleability

• conductivity

• tensile strength

• density

Tags

NGSS.MS-PS1-2

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

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

• Chemical change

• Physical change