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?

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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 breaking and forming of bonds. Examples include burning, rusting, and baking.

Front

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 changing 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 during a chemical change?

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During a chemical change, the atoms in the reactants rearrange to form new products, resulting in a change in chemical properties.

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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 bread, where yeast ferments and produces carbon dioxide, causing the dough to rise.

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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 in the air, forming iron oxide (rust).

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

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Is dissolving sugar in water a physical or chemical change?

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Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

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.