Chemical Reactions

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What is a chemical reaction?

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A process where substances (reactants) change into new substances (products) with different properties.

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What are indicators of a chemical reaction?

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Signs that a chemical reaction has occurred, such as production of heat or light, color change, formation of gas, and formation of a precipitate.

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Which of the following is NOT an indicator of a chemical reaction: production of heat, color change, production of gas bubbles, or dissolving?

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Dissolving of one substance in another is NOT an indicator of a chemical reaction.

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What does the Law of Conservation of Mass state?

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Matter cannot be created or destroyed in a chemical reaction; the mass of reactants equals the mass of products.

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What is a coefficient in a chemical equation?

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A number placed in front of a chemical formula to indicate how many molecules or moles of that substance are present.

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What does the number 4 represent in 4NH₃?

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It is a coefficient indicating there are 4 molecules of ammonia (NH₃).

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What is a product in a chemical reaction?

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The substances that are formed as a result of a chemical reaction.

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What is a reactant in a chemical reaction?

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The starting substances that undergo change during a chemical reaction.

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What is a color change in a chemical reaction?

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A change in color that indicates a chemical reaction has occurred, such as rust forming on iron.

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What is the formation of gas in a chemical reaction?

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The production of gas bubbles during a reaction, indicating a chemical change, such as fizzing when vinegar reacts with baking soda.