Chemical Energy Quiz Review

___________ occur when substances undergo chemical changes to form new substances.

• Chemicals Reactions

• Physical Changes

• Chemical Traits

• A change in density.

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NGSS.HS-PS1-2

Collision theory states that:

• chemical reactions occur when atoms or molecules of substances collide with sufficient energy to break apart bonds allowing new bonds to form.

• chemical reactions occur when the density of an object collides with its velocity.

• bonds are formed when the products from one reaction collide with the products from another reaction.

• collision occur when chemical reactions produce gases causing matter to run into other particles of matter.

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NGSS.HS-PS1-4

NGSS.HS-PS1-5

Simply stated, (a)   theory says reactions occur when atoms or molecules of a substance collide with sufficient energy to break apart existing bonds.

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NGSS.HS-PS1-5

A (a)   occurs when substances undergo chemical changes to form new substances.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Click all of the forms of energy that can be used to break bonds in a chemical reaction.

• Heat

• Electricity

• Sound

• Light

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NGSS.HS-PS1-4

A (a)   reaction absorbs energy as heat.

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NGSS.HS-PS1-4

A (a)   reaction releases energy as heat.

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NGSS.HS-PS1-4

In an exothermic reaction, heat is:

• Absorbed by the system

• Released by the system

• Transferred to space

• Used to complete a physical change.

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NGSS.HS-PS1-4

In an endothermic reaction, heat is:

• Absorbed by the system

• Released by the system

• Transferred to space

• Used to complete a physical change.

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NGSS.HS-PS1-4

Which of the following would be the system?

• The water

• The stove

• The pan

• The air around the pan of water.

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NGSS.HS-PS3-4