Physical and Chemical 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?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves the rearrangement of atoms and molecules. Examples include burning, rusting, and cooking.

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What are signs of a chemical change?

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Common signs of a chemical change include a change in color, the production of gas (bubbles), a change in temperature, and the formation of a precipitate.

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What happens to molecules during a chemical change?

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During a chemical change, the molecules of one substance are rearranged to form different substances.

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Is cooking an egg a physical or chemical change?

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Cooking an egg is a chemical change because it transforms the raw egg into a new substance with different properties.

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What is an example of a physical change?

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An example of a physical change is melting ice into water.

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What is burning?

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Burning is a chemical change that occurs when a substance reacts with oxygen to produce heat and light, resulting in new substances like ash and smoke.

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

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

Front

What is an example of a sign that a chemical change has occurred?

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A chemical has turned a different color, bubbled, and/or changed temperature.