Chemical vs 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 state (like melting or freezing) and dissolving.

Front

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 molecular structure of the substance. Examples include burning, rusting, and digestion.

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Is melting ice a physical or chemical change?

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Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition.

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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 the wood into ash, smoke, and gases, creating new substances.

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What happens to the chemical composition during a physical change?

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During a physical change, the chemical composition of the substance remains the same.

Front

What happens to the chemical composition during a chemical change?

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During a chemical change, the chemical composition of the substance changes, resulting in the formation of new substances.

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Is rusting of iron a physical or chemical change?

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Rusting of iron is a chemical change because it involves the reaction of iron with oxygen to form iron oxide (rust), a new substance.

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Is boiling water a physical or chemical change?

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Boiling water is a physical change because it changes from liquid to gas without altering its 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 chopping wood, where the wood's physical form changes but its chemical composition remains the same.

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What is an example of a chemical change?

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An example of a chemical change is baking a cake, where the ingredients undergo a chemical reaction to form a new product.