Physical and Chemical Changes

Which is the Law of Conservation of Matter?

• matter cannot be created or destroyed, it only changes form

• matter can be created but it cannot be destroyed, it never changes form

• matter can be destroyed but it cannot be created, it usually just changes form

• matter is an unproven theory created by Hans Geiger

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NGSS.MS-PS1-5

What is the product in the following chemical equation? 
H₂ + O₂   -->  

• H₂

• O₂

• H₂ + O₂

• H₂O

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A change in the size, shape, or state of matter.

• chemical change

• physical change

• chemical reaction

• electron change

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NGSS.MS-PS1-4

What happens in ALL chemical changes?

• Change in state of matter

• A new substance is formed

• Bubbles are produced

• An explosion

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Gallium has a melting point of 84 degrees. When a spoon of gallium is placed in room temperature water (~70 degees), it melts. This is an example of a ​ (a)   change.

• chemical

• physical

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

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

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

b

a

Dissolving

Photosynthesis

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Label the two images as examples of physical or chemical changes.

a

b

chemical change

physical change

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Process in which atoms of one or more substances rearrange to form one or more new substances

• chemical reaction

• chemical equations

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ice melting

• Chemical Change

• Physical Change

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NGSS.MS-PS1-4

NGSS.MS-PS3-4