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

Physical or Chemical Change?  Logs burning in a campfire.

• Physical Change
• Chemical Change

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NGSS.MS-PS1-2

Physical or Chemical Change?  Sodium metal burning in water.

• Physical Change
• Chemical Change

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NGSS.MS-PS1-2

Which of the following is an indication of chemical change

• Melting

• Freezing

• Burning

• Evaporating

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NGSS.MS-PS1-2

An egg spoils.

• physical change

• chemical change

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NGSS.MS-PS1-2

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

• Some of the atoms during the reaction escaped into the air.

• Some of the atoms during the reaction were destroyed.

• Some of the atoms during the reaction became heavier.

• Some of the atoms during the reaction changed to a different kind of atom.

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NGSS.MS-PS1-2

Magnesium reacts with oxygen to make

• magnesium oxide / basic in nature

• magnesium oxide / acidic in nature

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NGSS.MS-PS1-2

Why does the image best represent an example of a physical change?

• The pencil can no longer be used.

• The pencil is a different size.

• The materials making up the pencil did not change.

• The materials making up the pencil are different.

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NGSS.MS-PS1-2

Is it a physical or chemical change?

• physical

• chemical

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NGSS.MS-PS1-2

Can one substance change into another substance? (read carefully)

• No, because things can mix, but they can't change into new things

• Yes, because new atoms can be created

• No, because atoms can not be destroyed

• Yes, because atoms can be rearranged.

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NGSS.MS-PS1-2