Thermochemistry

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What is thermochemistry?

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Thermochemistry is the study of the heat energy associated with chemical reactions and changes of state.

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases heat to its surroundings.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

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What happens during evaporation?

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During evaporation, a liquid absorbs heat and changes into a gas.

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What is a catalyst?

Back

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

Front

What does a catalyst do to activation energy?

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A catalyst decreases the activation energy needed for a reaction to occur.

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What is the activated complex?

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The activated complex, also known as the transition state, is a temporary state during a chemical reaction where reactants are in the process of forming products.

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What is ΔH vaporization?

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ΔH vaporization is the amount of heat required to convert a unit mass of a liquid into vapor without a change in temperature.

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What is the difference between freezing and evaporation?

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Freezing is an exothermic process where a liquid turns into a solid, while evaporation is an endothermic process where a liquid turns into a gas.

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What is the transition state in a chemical reaction?

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The transition state is the highest energy state during a reaction, where old bonds are breaking and new bonds are forming.