NGSS.MS-PS1-2

Is making orange juice a physical or chemical change?

• Physical 
• Chemical

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NGSS.MS-PS1-2

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

• His chemical reaction defied the law of conservation of mass

• The product destroyed mass during the reaction

• The reactants created matter during the reaction

• The gas that was produced was not able to be weighed since the container was open.

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NGSS.MS-PS1-2

A type of chemical weathering in which a substance combines with oxygen, as when iron oxidizes, forming rust.

• Acid rain

• Oxidation

• Reaction to water

• Exfoliation

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NGSS.MS-PS1-2

Paula works at a paint company and is developing new ingredients to make paint safer to use. She mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Paula found two yellow substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

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NGSS.MS-PS1-2

Carbonic acid is formed in nature when -

• Water dissolves particles of soil to form mud

• The oxygen molecules in water bond with minerals in rocks

• Water bonds with carbon dioxide in the air and/or soil

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NGSS.MS-PS1-2

What is a product (in chemical reactions)?

• Something a company will try to sell to you

• Also a potato

• When the mitosis space-time folds into a tetrahedron flux-capacitor

• The substance(s) that are created after a chemical reaction

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NGSS.MS-PS1-2

Is this an example of a physical or chemical change?

• physical

• chemical

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NGSS.MS-PS1-2

Is this an example of a physical or chemical change?

• physical

• chemical

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NGSS.MS-PS1-2

Choose every image that represents a chemical change.

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NGSS.MS-PS1-2

A process that creates new substances from existing substances and can absorb or release thermal energy

• chemical reaction

• thermal energy

• temperature

• kinetic energy

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NGSS.MS-PS1-2