Chemical and Physical Changes (3.2)

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What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

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Give an example of a physical change.

Back

Melting ice into water.

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NGSS.MS-PS1-4

Front

Give an example of a chemical change.

Back

Burning of wood.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What evidence indicates a chemical change has occurred?

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Evidence includes color change, gas production, temperature change, and formation of a precipitate.

Tags

NGSS.MS-PS1-2

Front

What is the law of conservation of mass?

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The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

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Is boiling water a chemical change? Why or why not?

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No, boiling water is a physical change because the vapor is still water.

Tags

NGSS.MS-PS1-4

Front

What happens to the mass of reactants and products in a chemical reaction?

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The mass of the reactants equals the mass of the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

Tags

NGSS.MS-PS1-5