Reporting Category 1

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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 reactants in a chemical equation?

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Reactants are the starting substances in a chemical reaction, found on the left side of a chemical equation.

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction, found on the right side of a chemical equation.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

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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 a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Examples include salad and air.

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What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

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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 (rust).