Physical and Chemical changes

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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.

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What is a chemical change?

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A chemical change is a process that involves the transformation of one or more substances into different substances, resulting in the formation of new chemical compounds.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are some indicators of a chemical change?

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

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NGSS.MS-PS1-2

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Is melting ice a physical or chemical change?

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Melting ice is a physical change because it changes the state of water from solid to liquid without altering its chemical composition.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What happens to the molecules during a physical change?

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

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What is an example of a chemical change?

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An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Can a chemical change be reversed?

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Most chemical changes are not easily reversible, as they create new substances that cannot be converted back to the original substances.

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NGSS.MS-PS1-2

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

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A physical change alters the form or appearance of a substance without changing its chemical identity, while a chemical change results in the formation of new substances.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Is dissolving sugar in water a physical or chemical change?

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Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

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What is an example of evidence for a physical change?

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An example of evidence for a physical change is a change in shape, such as molding clay.