Physical and Chemical Properties and Changes

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What is a physical property?

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A characteristic of a substance that can be observed or measured without changing the substance's identity, such as color, hardness, and boiling point.

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What is a chemical property?

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A characteristic of a substance that describes its ability to change into different substances, such as reactivity with acid or flammability.

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What is hardness in terms of material properties?

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Hardness is a physical property that describes a material's resistance to being scratched or dented.

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What indicates a chemical change has occurred?

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Unexpected color change, temperature change, gas production, or formation of a precipitate.

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What happens during a chemical change?

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A chemical change creates a new substance and cannot be undone.

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What is an example of a physical change?

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Melting ice or boiling water, where the substance changes state but remains the same substance.

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What is an example of a chemical change?

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Burning wood, where the wood transforms into ash and gases, creating new substances.

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How can you identify a physical change?

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If the change can be reversed and the substance retains its original properties, it is a physical change.

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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 substance's chemical composition, while a chemical change results in the formation of new substances.

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What does it mean for a substance to be flammable?

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Flammability is a chemical property that indicates a substance's ability to catch fire and burn.