Chemical Reactions

Which one shows that a chemical reaction has occurred?

• dissolving

• melting

• formation of a gas

• bending

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change

• nuclear change

• physical change

• mutation

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

a copper penny turning greenish after a few years.

• Chemical Change

• Physical Change

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NGSS.MS-PS1-2

In a ___________change, a substance changes into a different substance.

• Physical

• Chemical

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the BEST definition of a chemical reaction?

• A change in matter that produces one or more NEW substances

• When two things combine and EXPLODE.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a chemical change?

• water freezes to form ice

• sugar dissolves in water

• gasoline burns in a car engine

• a piece of metal expands when it is heated

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens in ALL chemical changes?

• Change in state of matter

• A new substance is formed

• Bubbles are produced

• An explosion

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

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NGSS.MS-PS1-5

Which of the following is an example of a chemical change?

• rusting of a bicycle

• painting a house

• washing a dog

• tearing up a newspaper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the law of conservation of mass...

• sometimes atoms are lost

• sometimes atoms are gained

• atoms are never lost nor gained

• atoms are lost and gained

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NGSS.MS-PS1-5