AP24 Q2 Class 24 (Mechanisms; Intermediates; Catalysts

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What is an intermediate in a chemical reaction?

Back

An intermediate is a species that is formed during the reaction and is consumed in subsequent steps, not appearing in the overall reaction.

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What is a catalyst?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Front

How can you experimentally determine intermediates in a reaction?

Back

By using techniques such as spectroscopy or chromatography to detect and analyze species present during the reaction.

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What is the significance of the slowest step in a reaction mechanism?

Back

The slowest step, also known as the rate-determining step, controls the overall rate of the reaction.

Front

What is a catalytic converter?

Back

A catalytic converter is a device in an automobile exhaust system that reduces pollution by converting harmful gases into less harmful emissions.

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What is the role of heat of reaction in determining reaction mechanisms?

Back

The heat of reaction (enthalpy change) can provide insights into the energy changes and stability of intermediates, helping to distinguish between possible mechanisms.

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What does the term 'reactant' refer to in a chemical reaction?

Back

A reactant is a substance that undergoes a change during a chemical reaction, participating in the formation of products.

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What is the difference between a reactant and a product?

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Reactants are the starting materials in a chemical reaction, while products are the substances formed as a result of the reaction.

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What is the importance of reaction mechanisms in chemistry?

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Reaction mechanisms provide a detailed understanding of the steps involved in a reaction, helping to predict the behavior of reactants and products.

Front

What is the purpose of measuring the rate constant at different temperatures?

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Measuring the rate constant at different temperatures helps to understand the effect of temperature on reaction rates and can provide insights into the mechanism.