Classifying Physical and Chemical Changes Flashcard

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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 change that results in the formation of new chemical substances. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and digestion.

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

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The properties of a substance may change in terms of appearance, state, or size, but its chemical identity remains the same.

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What happens to the properties of a substance during a chemical change?

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The properties of a substance change completely, and new substances with different chemical identities are formed.

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Is carving wood a physical or chemical change?

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Carving wood is a physical change because it alters the shape and size of the wood without changing its chemical composition.

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Is salt dissolving in water a physical or chemical change?

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Salt dissolving in water is a physical change because the salt can be recovered by evaporating the water, and its chemical composition remains unchanged.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity. Examples include color, melting point, and density.

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What is a chemical property?

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A chemical property is a characteristic of a substance that describes its ability to undergo a specific chemical change. Examples include flammability and reactivity with acids.

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Give an example of a physical property.

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An example of a physical property is the color of a substance, such as blue or red.

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Give an example of a chemical property.

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An example of a chemical property is gasoline's ability to burn, which indicates its flammability.