Chemical and Physical Changes

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What is a chemical change?

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A process where substances combine or break apart to form new substances, often accompanied by energy changes.

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition.

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What are reactants in a chemical equation?

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The starting substances that undergo a chemical change, found on the left side of the equation.

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What are products in a chemical equation?

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

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What does the subscript in a chemical formula indicate?

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The number of atoms of an element in a molecule.

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What is an example of a physical change?

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Melting ice, as it changes from solid to liquid but remains water.

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What is an example of a chemical change?

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Rusting of iron, as it forms a new substance (iron oxide).

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; it remains constant.

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What is an indicator of a chemical reaction?

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Formation of a gas, change in color, temperature change, or formation of a precipitate.

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What is a precipitate?

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A solid that forms and settles out of a liquid mixture during a chemical reaction.