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

A student added sugar to a cup of water and stirred with a spoon.  After 10 minutes you could not see the sugar anymore.  What happened to the sugar?

• the sugar evaporated
• the sugar dissolved
• the sugar was magnetic

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NGSS.MS-PS1-2

Is hammering wood together to build a house a chemical or physical change?

• chemical
• physical

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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

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NGSS.MS-PS1-2

a solid that forms from a solution during a chemical reaction

• precipitate
• reactant
• acid
• metal

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NGSS.MS-PS1-2

When reactants combine, the resulting products need to have ________ the reactants

• the same properties as

• many properties in common with

• different properties than

• none of the above

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NGSS.MS-PS1-2

When iron is exposed to air over a long period of time, it forms rust. This is an example of what?

• A new substance forming

• Color change: no new substance

• Shape change: no new substance

• Burning: a new substance

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NGSS.MS-PS1-2

The earth is built up and torn down in many ways. Physical and chemical weathering are processes which are very important in making soil. Which statement accurately describes an example of chemical weathering?

• Tree roots break apart a rock.

• Sinkholes are formed in central Florida as seeping water dissolves underground limestone rocks.

• In Alaska, rocks are broken due to continuous freezing and thawing of water sitting in cracks.

• Blowing sand has created beautiful and strange rock formations in the Western United States.

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NGSS.MS-PS1-2

A chemical change

• changes the physical properties of an object, but does not create a new substance.

• creates a new substance and cannot be undone.

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NGSS.MS-PS1-2

Metals react with acids to produce a gas

• Carbon dioxide

• Nitrogen

• Hydrogen

• Oxygen

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NGSS.MS-PS1-2