Physical vs. Chemical Change

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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NGSS.MS-PS1-4

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is a sign that a chemical reaction has occurred?

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Formation of a gas, change in color, temperature change, or the production of light are signs of a chemical reaction.

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NGSS.MS-PS1-2

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What does the law of conservation of mass state?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is only transformed from one substance to another.

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NGSS.MS-PS1-5

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Is melting chocolate a physical or chemical change?

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Melting chocolate is a physical change because it changes from solid to liquid but retains its chemical composition.

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NGSS.MS-PS1-4

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What happens to the mass of substances during a chemical change?

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The total mass of substances before and after a chemical change remains the same, according to the law of conservation of mass.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is an example of a chemical change in food?

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Digestion of food is a chemical change because it breaks down food into new substances.

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NGSS.MS-LS1-7

NGSS.MS-PS1-2

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What is an example of a physical change?

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An example of a physical change is ice melting into water.

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NGSS.MS-PS1-4

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What is the difference between a physical property and a chemical property?

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A physical property can be observed without changing the substance's identity (e.g., color, mass), while a chemical property describes a substance's ability to undergo a chemical change (e.g., flammability).

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What happens to the texture of a substance during a physical change?

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The texture may change during a physical change, but the substance itself remains the same chemically.

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NGSS.MS-PS1-4