Chemical + Physical Changes

A chemical change

• changes matter from one form to another.

•  destroys matter.

• creates matter

• does not change matter in any way.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a physical change?

•  Iron is oxidized to iron oxide

• Aluminum metal is pounded into thin sheets

• Copper reacts with a strong acid

• Sodium metal explodes on contact with water

Which of the following is an example of a chemical change?

• melting solid gold

• burning hydrogen gas

• dissolving sugar in water

• breaking a sheet of glass

Tags

NGSS.MS-PS1-2

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

• A chemical has changed size.

• A chemical has changed to a different state (solid, liquid or gas)

• A chemical has become a different shape.

• A chemical has turned a different color.

Tags

NGSS.MS-PS1-2

When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a...

•  change of form

• chemical change

•  change of state

• physical change

Tags

NGSS.MS-PS1-2

Two solutions are added together and the new solution becomes hot. This tells you that

• a gas is being produced.

• the solutions are not soluble. 

• the physical properties are the same.

• a chemical change is taking place.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?

• both chemical and physical

• only physical

•  neither chemical nor physical

• only chemical

Tags

NGSS.MS-PS1-2

Jolene wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically?

• burning the sugar cube with a match

• crushing the sugar cube and dissolving it in water

• dehydrating the sugar cube with sulfuric acid

• chewing the sugar cube and digesting it

Tags

NGSS.MS-PS1-2

A physical change occurs when…

•  both the appearance of a substance and its phase change.

• the appearance of a substance changes but its phase does not.

• the phase of a substance changes but its appearance does not.

•  neither the appearance of a substance nor its phase changes.

Diane draws a picture on a piece of paper and then folds it into a paper airplane. She throws it at her little brother, and it hits him in the head. He responds by ripping up the paper. Which of the following is an example of a physical change?

• ripping up the paper

• folding the paper into an airplane

• drawing on the paper

•  all of these