Chemical Reactions

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What is a chemical reaction?

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A process where substances (reactants) undergo a transformation to form new substances (products).

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What are some signs that a chemical reaction has occurred?

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Color change, odor change, gas production, formation of a precipitate, and temperature change.

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What is a physical change?

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A change that does not result in the formation of new substances, such as melting or boiling.

Front

What is a chemical change?

Back

A change that results in the formation of new substances, such as burning or rusting.

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

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What is a reactant?

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A substance that undergoes a chemical change in a reaction.

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What is a product?

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A substance that is formed as a result of a chemical reaction.

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What is an example of a chemical change?

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Burning wood, rusting iron, or cooking food.

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What is an example of a physical change?

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Melting ice, dissolving sugar in water, or breaking a glass.

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What is a catalyst?

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A substance that speeds up a chemical reaction without being consumed in the process.