Physical and Chemical Changes Lesson

Is melting butter for popcorn a chemical or physical change?

• chemical

• physical

Tags

NGSS.MS-PS1-2

The melting of wax is an example of a

• chemical change

• physical change

Tags

NGSS.MS-PS1-2

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

Match the following descriptions of changes with their correct type.

• A description of a physical change

• A change that does not involve a change in a substance's chemical makeup and is usually reversible

• A description of a chemical change

• A change that only occurs in the physical state of a substance without temperature change

• A description of a change that leads to new substance formation

• A change that results in the formation of a new substance

• A description of a change that is not related to temperature

• A change that involves a change in a substance's chemical makeup and is usually irreversible

Tags

NGSS.MS-PS1-2

Match the following:

• Examples of Chemical Changes

• Combustion, Rusting, Burning, Corroding

• Examples of Physical Changes

• Physical Changes

• changes that cause a substance to change into a new substance

• Chemical Changes

• Changes that change the appearances of the substance, not is identify.

• Freezing, Grinding, Chopping, Tearing, Evaporating

Tags

NGSS.MS-PS1-2

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-PS1-2

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-PS1-4

NGSS.MS-PS1-5

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

• new substance

• NO new substance

• a new shape

• a new texture

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

a transition of matter from one state (solid, liquid or gas) to another.

• Physical Change

• Chemical Change

• Phase Change

Tags

NGSS.MS-PS1-4

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

b

a

Dissolving

Photosynthesis

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5