Chemical Physical Changes

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

NGSS.MS-PS1-5

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

A chemical change

• changes matter from one form to another.

•  destroys matter.

• creates matter

• does not change matter in any way.

Tags

NGSS.MS-PS1-5

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

If you burn paper, the ​ (a)   in the paper change to molecules of ash and smoke. This is a ​ (b)   change.

• chemical

• molecules

• physical

• liquid

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select all of the following examples that are chemical changes​ ​ (a)   ​ (b)   ​ (c)  

• Breaking a piggy bank

• fireworks exploding

• getting a haircut

• melting icicle

• hammering metal

• mixing baking soda and vinegar

• a rusty nail

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Tearing paper and chopping wood are examples of ​ (a)   change, while burning paper or wood is an example of ​ (b)   change.

• physical

• chemical

• state

• molecular

Tags

NGSS.MS-PS1-4

Baking a cake is a (a)   ​ change.

• chemical

• physical

• emotional

Tags

NGSS.MS-PS1-4

A chemical change is when a ​ (a)   is formed. A physical change is when ​ (b)   is formed.

• new substance

• NO new substance

Answer explanation

A chemical change occurs when a new substance is formed as a result of a chemical reaction, while a physical change occurs when there is a change in the state or appearance of a substance without altering its chemical composition. In this question, the correct choices are 'new substance' for a chemical change and 'NO new substance' for a physical change.

Tags

NGSS.MS-PS1-2

An evidence of a chemical reaction can be​ (a)   while a physical reaction results in ​ (b)   .

• gas,light or odor production

• absorption or being dissolved

Tags

NGSS.MS-PS1-2