Physical & 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 includes processes like rusting, burning, and souring of milk.

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What is a sign that a chemical reaction has occurred?

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

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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 and gases, creating new substances.

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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.

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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 the rusting of iron, where iron reacts with oxygen to form iron oxide (rust).

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How can you tell if a chemical change has occurred?

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You can tell if a chemical change has occurred by observing changes such as gas formation, color change, temperature change, or 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 affects the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.