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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 breaking.

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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 the rearrangement of atoms. Examples include rusting, burning, and reacting 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 glass breaking.

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What is an example of a chemical change?

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An example of a chemical change is a rusting bicycle.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, density, and magnetism.

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What is a chemical property?

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A chemical property is a characteristic of a substance that becomes evident during a chemical reaction. It describes the substance's ability to undergo changes that transform it into different substances.

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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 based on their magnetic fields.

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What happens when hydrochloric acid reacts with magnesium?

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When hydrochloric acid reacts with magnesium, it produces hydrogen gas and magnesium chloride, which is a chemical change.

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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 expressed in grams per cubic centimeter (g/cm³).

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What is the freezing point?

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The freezing point is the temperature at which a liquid turns into a solid. For water, it is 0 degrees Celsius (32 degrees Fahrenheit).