Chemical and Physical Change

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

NGSS.MS-PS1-5

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-PS1-4

NGSS.MS-PS3-4

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.

Tags

NGSS.MS-PS1-4

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

David added a little baking soda to a beaker that contained vinegar.  Bubbles started coming from the mixture and a gas was released.  The gas was evidence that:

• the mixture was starting to boil.

• the air in the flask contracted.

• the vinegar and baking soda expanded.

• a chemical reaction took place.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When water in an open pan is heated for a long time, it becomes...

• a solid

• a vacuum

• a gas

• dew

Tags

NGSS.MS-PS1-4

Which of the following is an example of MELTING?

• stirring some sugar in water until you can't see the sugar

• heating a pan of water until the water is all gone

• heating a block of ice until the ice turns to water

• cooling water in the freezer until the water becomes solid

Tags

NGSS.MS-PS1-4

Vinegar is an acid that bubble when it interacts with calcite.  Which mineral contains calcite? (Use the table below to answer.)

• limestone

• sandstone

• granite

• gneiss

Tags

NGSS.MS-PS1-2