Physical & Chemical Properties & 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. 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 includes processes like burning, rusting, and cooking.

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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 the substance's 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 becomes evident during a chemical reaction. It describes the substance's potential to undergo chemical changes, such as reactivity with acids or bases.

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What happens to silver spoons when they tarnish?

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Tarnishing is a chemical change where silver reacts with sulfur compounds in the air, forming silver sulfide, which appears as black spots.

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What is the melting point?

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The melting point is the temperature at which a solid becomes a liquid. It is a physical property of a substance.

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What is an example of a physical change?

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An example of a physical change is water evaporating into steam. The water's chemical composition remains 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 frying an egg, where the proteins in the egg undergo a chemical reaction and change structure.

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What is the difference between physical and chemical changes?

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Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

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What does chewing food represent in terms of changes?

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Chewing food represents a physical change as it breaks down food into smaller particles without changing its chemical composition.