Physical and Chemical Changes

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What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties, often involving the breaking and forming of chemical bonds.

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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 one or more physical properties of a substance without changing its chemical composition, such as changes in state, shape, or size.

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Give an example of a chemical change.

Back

An example of a chemical change is the explosion of fireworks, where new substances are formed.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Give an example of a physical change.

Back

An example of a physical change is slicing bread, where the bread's physical form is altered but its chemical composition remains the same.

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What happens to the molecules during a chemical change?

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During a chemical change, the molecules of the reactants are rearranged to form new molecules of the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

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Is boiling water a physical or chemical change?

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Boiling water is a physical change because it involves a change in state from liquid to gas without altering the chemical composition of water.

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NGSS.MS-PS1-4

Front

What is an indicator of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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NGSS.MS-PS1-2

Front

Are hard boiled eggs a physical or chemical change?

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Hard boiled eggs represent a chemical change because the proteins in the egg undergo a chemical transformation when heated.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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

Back

The main difference is that a physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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NGSS.MS-PS1-2