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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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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into new substances with different properties. Examples include rusting, burning, and fermentation.

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What are some signs that a chemical reaction has occurred?

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Signs of a chemical reaction include the formation of a gas, change in color, formation of a precipitate, and change in temperature.

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Is melting butter for popcorn a chemical or physical change?

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Melting butter for popcorn is a physical change.

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True or False: Change in color is always a sign of a physical change.

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False. Change in color can indicate a chemical change.

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Which of the following is NOT an example of a physical change: crumpled paper, pencil sharpening, shrunken clothing, or rust?

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Rust is NOT an example of a physical change; it is a chemical change.

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What happens during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

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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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What is an example of a chemical change?

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An example of a chemical change is iron rusting.

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

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.