Chemical and Physical 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 boiling.

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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. Examples include rusting of iron and burning wood.

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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. Examples include reactivity with acids and flammability.

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What happens to water when it is heated to form steam?

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When water is heated to form steam, it undergoes a physical change from liquid to gas, but its chemical composition remains H2O.

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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 occurs when iron rusts?

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When iron rusts, it undergoes a chemical change, reacting with oxygen and moisture to form iron oxide.

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Is inflating a tire a chemical or physical change?

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Inflating a tire is a physical change because it involves changing the volume of air inside the tire without altering the air's chemical composition.

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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 the reaction of vinegar and baking soda, which produces carbon dioxide gas.

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