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What is a physical change?

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A physical change is a change that does not result in the formation of new substances. Examples include freezing, melting, 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 substances. Examples include burning, rusting, and cooking.

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What is a molecule?

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A molecule is made of two or more atoms bonded together. For example, water (H2O) is a molecule made of two hydrogen atoms and one oxygen atom.

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What are the properties of matter?

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Properties of matter include characteristics such as mass, volume, density, color, odor, and magnetism.

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What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products, resulting in the formation of new substances.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

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What is an example of a physical change?

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An example of a physical change is freezing water to make ice.

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What is an example of a chemical change?

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An example of a chemical change is the combustion of wood, which produces ash and gases.

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What is the difference between a physical change and a chemical change?

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A physical change does not create new substances, while a chemical change does.

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.