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 changes in shape, state, or size.

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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 the rearrangement of atoms.

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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, mass, volume, and melting point.

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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 ability to undergo changes that transform it into different substances.

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What evidence indicates a physical change?

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Evidence of a physical change includes changes in shape, size, or state of matter, such as melting, freezing, or dissolving.

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What evidence indicates a chemical change?

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Evidence of a chemical change includes the production of gas, formation of a precipitate, color change, or release of energy (light or heat).

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What is malleability?

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Malleability is a physical property that describes a material's ability to be deformed or shaped under compressive stress, often by hammering or rolling.

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What is flammability?

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Flammability is a chemical property that describes a substance's ability to ignite and burn in the presence of oxygen.

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What happens to water when it is heated to steam?

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When water is heated to steam, it undergoes a physical change from liquid to gas, without changing its chemical composition.

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

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A physical change alters the form or appearance of a substance without changing its chemical identity, while a chemical change results in the formation of new substances.