Chemical and Physical Reactions

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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. An example is getting a haircut.

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What is a chemical change?

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A chemical change is a change in the state of matter in which the material transforms into an entirely different material with properties that differ from the original material.

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What are the reactants in a chemical equation?

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

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What are the products in a chemical equation?

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

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What is a chemical reaction?

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A chemical reaction is the process by which one or more substances undergo a change to form new substances.

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What are some signs that a chemical reaction has occurred?

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Signs of a chemical reaction include color change, temperature change, gas production, formation of a precipitate, and change in odor.

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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; the total mass of reactants equals the total mass of products.

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What is an example of a physical change?

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An example of a physical change is melting ice 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 rust forming on iron.

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

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A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different properties.