Physical and Chemical Changes

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing the substance's identity, such as color, shape, density, and magnetism.

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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, such as melting, freezing, or 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, often indicated by color change, gas production, or heat release.

Front

What happens to molecules when a liquid is heated?

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When a liquid is heated, the energy increases, causing the molecules to move faster.

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What is magnetism?

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Magnetism is a physical property that describes the ability of a material to attract or repel other materials, typically metals.

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What is density?

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Density is a physical property defined as mass per unit volume of a substance, often used to determine if an object will float or sink.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, such as sugar dissolving in water.

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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 wood burning to produce ash and smoke.

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What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes color change, gas production, temperature change, and the formation of a precipitate.