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 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. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning and digestion.

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Is chewing food a Physical or Chemical Change?

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Chewing food is a Physical Change because it breaks the food into smaller pieces without changing its chemical structure.

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Is digesting food a Physical or Chemical Change?

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Digesting food is a Chemical Change because it involves breaking down food into new substances through chemical reactions.

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What happens during boiling water?

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Boiling water is a Physical Change where water changes from liquid to gas (steam) without changing its chemical composition.

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What happens when ice melts?

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When ice melts, it undergoes a Physical Change from solid to liquid, but the chemical structure of water remains the same.

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Is burning wood a Physical or Chemical Change?

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Burning wood is a Chemical Change because it transforms wood into ash, smoke, and gases, creating new substances.

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What is an example of a Physical Change in the kitchen?

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An example of a Physical Change in the kitchen is chopping vegetables, which changes their shape but not their chemical composition.

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What is an example of a Chemical Change in cooking?

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An example of a Chemical Change in cooking is baking a cake, where ingredients react to form new substances.

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What are indicators of a Chemical Change?

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Indicators of a Chemical Change include color change, temperature change, gas production, and the formation of a precipitate.