Chemical and Physical Changes

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing its identity, such as color, shape, or brittleness.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to undergo a chemical change, such as reactivity with air or water.

Front

What happens during a chemical change?

Back

A new substance is formed, which has different properties from the original substance.

Front

What is reactivity?

Back

The ability of a substance to undergo a chemical reaction, either by itself or with other materials.

Front

What is an example of a physical change?

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Melting ice into water; the substance remains H2O.

Front

What is an example of a chemical change?

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Burning wood; it transforms into ash and gases, creating new substances.

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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 identity, while a chemical change results in the formation of new substances.

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What is brittleness?

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A physical property that describes a material's tendency to break or shatter easily.

Front

What does it mean to say a substance reacts with air?

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It indicates a chemical property, showing that the substance can undergo a chemical reaction when exposed to oxygen.

Front

What is digestion in terms of chemical and physical changes?

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Digestion is a chemical change where food is broken down into simpler substances.