P vs C Changes and Chemical Reactions

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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 burning, rusting, and baking.

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What are some indicators of a chemical reaction?

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

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What is an endothermic process?

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An endothermic process is a reaction that absorbs energy from its surroundings, usually in the form of heat. Examples include baking bread and cooking an egg.

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What is an exothermic process?

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An exothermic process is a reaction that releases energy to its surroundings, usually in the form of heat. Examples include combustion and respiration.

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What happens during a physical change?

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During a physical change, the form of a substance changes, but its chemical identity remains the same.

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What happens during a chemical change?

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During a chemical change, the substances involved undergo a transformation that results in the formation of new substances with different properties.

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting water, but some may not be easily reversible.

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Can a chemical change be reversed?

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Chemical changes are often not easily reversible, as they result in new substances that cannot be converted back to the original substances without additional chemical reactions.

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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.