Chapter 8 Chemical Reactions

Which of these is NOT a sign that a chemical change has occurred? 

• A loss of transparency 
• An unexpected color change
• A temperature change
• The formation of a precipitate

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NGSS.MS-PS1-2

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

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NGSS.MS-PS1-2

An gel ice pack getting cold after you put it in the freezer for an hour.

• Chemical Change
• Physical Change

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers
• Bonds
• Reactants
• Products

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NGSS.MS-PS1-2

A candle wick burning is an example of a _________________________

• physical reaction
• condensation
• neutrons
• chemical reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.

• reactants
• products
• neutrals
• energizers

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NGSS.MS-PS1-5

To stop a fire we must cut off or stop the ...

• carbon dioxide

• nitrogen

• oxygen

• air

A solid that is deposited from a solution

• Solid

• Liquid

• Product

• Precipitate

A substance produced during a chemical reaction

• Product

• Reactant

• Properties

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NGSS.MS-PS1-2

NGSS.MS-PS1-5