Collision Theory. Factors that Affect Reaction Rates

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What is Collision Theory?

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Collision Theory explains how chemical reactions occur and why reaction rates differ for different reactions. It states that for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation.

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What factors affect the rate of a chemical reaction?

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The main factors affecting reaction rates include temperature, concentration of reactants, surface area, and the presence of catalysts or inhibitors.

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How does increasing temperature affect reaction rates?

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Increasing temperature generally increases reaction rates because it provides reactant particles with more energy, leading to more frequent and energetic collisions.

Front

What is surface area in the context of reaction rates?

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Surface area refers to the exposed area of a solid reactant. Increasing surface area (e.g., by crushing a solid) allows more particles to collide with reactants, increasing the reaction rate.

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What is concentration in a chemical reaction?

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Concentration refers to the amount of a substance in a given volume. Higher concentration means more particles are present, leading to more collisions and a higher reaction rate.

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What is the effect of a catalyst on reaction rates?

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A catalyst increases the rate of a reaction by providing an alternative pathway with a lower activation energy, allowing more collisions to result in a reaction.

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What happens to reaction rates when an inhibitor is present?

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An inhibitor decreases the rate of a reaction by interfering with the reactants or the catalyst, reducing the number of effective collisions.

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What is the relationship between particle collisions and successful reactions?

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Not all particle collisions result in a chemical reaction. Most collisions are unsuccessful and do not lead to a reaction.

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What is activation energy?

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Activation energy is the minimum energy required for a chemical reaction to occur. It is the energy needed to break bonds in the reactants.

Front

How does increasing surface area affect reaction rates?

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Increasing surface area allows more particles to be exposed and available for collisions, which increases the frequency of successful collisions and thus the reaction rate.