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.

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 the rearrangement of atoms. Examples include rusting, burning, and cooking.

Front

Is dissolving salt in water a physical or chemical change?

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

Front

What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products through the breaking and forming of chemical bonds, resulting in new substances.

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What is an example of a chemical change?

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An example of a chemical change is the reaction between vinegar and baking soda, which produces carbon dioxide gas.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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How can you tell if a chemical change has occurred?

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Signs of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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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 a new substance, while a chemical change results in the formation of one or more new substances.

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Is the spoiling of food a physical or chemical change?

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The spoiling of food is a chemical change because it involves the breakdown of food substances and the formation of new compounds.

Front

What is an example of a physical change?

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