The following questions may use concepts from this and...

The following questions may use concepts from this and previous chapters. Without doing calculations, decide whether each of the following is exo-or endothermic. (a) the combustion of natural gas (b) the decomposition of glucose, $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6},$ to carbon and water

The following questions may use concepts from this and previous chapters.
Without doing calculations, decide whether each of the following is exo-or endothermic.
(a) the combustion of natural gas
(b) the decomposition of glucose, $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6},$ to carbon and water

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Key Concepts

Thermochemistry

Thermochemistry is the branch of chemistry that studies the energy changes, particularly heat, associated with chemical reactions and physical transformations. It provides the framework and tools, such as calorimetry, to measure and understand whether reactions are exothermic or endothermic, which is fundamental in predicting reaction behavior and energy requirements.

Endothermic Reaction

An endothermic reaction is one that absorbs energy from its surroundings, resulting in an increase in the system’s internal energy. Such reactions exhibit a positive enthalpy change (?H > 0) and typically require continuous energy input to maintain the process, as seen in many decomposition reactions.

Exothermic Reaction

An exothermic reaction is a chemical process that releases energy in the form of heat to its surroundings, leading to a net decrease in the system’s internal energy. This is generally indicated by a negative enthalpy change (?H < 0) and is characteristic of reactions like combustion, where energy is rapidly released.

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