Physical Change and Chemical Change

Is melting butter for popcorn a chemical or physical change?

• chemical

• physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Changes in size and shape are examples of ­­­­­_____ changes in matter.

• Physical

• Chemical

Physical changes can be brought about by

• Cutting

• Bending

• Dissolving

• All of the following are correct.

True or false: Physical changes include changes in the state of matter.

• True

• False

Tags

NGSS.MS-PS1-4

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

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

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

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

Chemical Change results in ​ (a)   while a physical reaction results in atoms ​ (b)   in a reaction.

• a new substance

• rearranged

Tags

NGSS.MS-PS1-2

Which is a chemical change and which is a physical change?

b

a

Photosynthesis

Dissolving

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5