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 includes processes like burning, rusting, and digestion.

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What are signs that a chemical reaction has occurred?

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

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What is the difference between physical properties and chemical properties?

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Physical properties can be observed without changing the substance's identity (e.g., color, boiling point), while chemical properties describe a substance's ability to undergo a chemical change (e.g., reactivity with acid).

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What is an example of a physical change?

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

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What is an example of a chemical change?

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An example of a chemical change is iron rusting when exposed to oxygen and moisture.

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How can temperature change indicate a chemical reaction?

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A temperature change can indicate a chemical reaction if the reaction releases or absorbs heat, resulting in a noticeable temperature increase or decrease.

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What is the role of gas formation in identifying a chemical change?

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The formation of gas during a reaction is a strong indicator of a chemical change, as it often signifies that new substances are being produced.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, forming a solution. It is a physical property.

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What is conductivity?

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Conductivity is the ability of a substance to conduct electricity. It is a physical property that can help identify materials.