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What does a large bond dissociation energy correspond to?

A large bond dissociation energy corresponds to a strong bond that requires more energy to break. This means that the bond is more stable and less likely to undergo chemical reactions or decomposition.


Why are flight muscle tissue of bats contain very large numbers of mitochondria?

The most prominent roles of mitochondria are to produce ATP from stored energy, through the process of respiration. Since flight requires a large amount of energy, the muscles involved in flight must have a sufficient amount of mitochondria in their cells to produce this energy.


What is the difference between a thermodynamically favorable and a thermodynamically unfavorable reaction?

Enthalpy change is not the only consideration for whether a reaction is favorable. However, if the enthalpy change is large, it is usually the dominant factor in determining favorability. Therefore, reactions that have a large, negative tend to be favorable, because the reaction usually releases energy when it occurs. Reactions that have a large, positive tend to be unfavorable as written, because the reaction usually requires energy to occur.


When does a coaster have a large amount of Kinetic Energy and when does it have a large amount of Potential Energy?

The coaster have a large amount of potential energy when it gain height, kinetic energy when it gain speed instead.


Why don't H2 and O2 react as soon as they mix?

The activation energy barrier. Combining H atoms and O atoms into water releases a large amount of energy, but breaking up H2 molecules and O2 molecules into H and O atoms requires a large (but not as large) amount of energy. You need to supply sufficient energy to get things started, after which it's generally self-sustaining (and very rapidly so; a stoichiometric mixture of H2 and O2 is quite explosive once ignited).

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