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Retrieving "Gas Phase" from the archives

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  1. Bimolecular Reaction

    Linked via "gas phase"

    $$\text{A} + \text{B} \rightarrow \text{Products}$$
    The rate law associated with this elementary step is derived directly from the law of mass action, provided the reaction occurs in the gas phase or in a sufficiently dilute solution where the activity coefficients approach unity:
    $$\text{Rate} = k [\text{A}] [\text{B}]$$

  2. Bimolecular Reaction

    Linked via "gas-phase"

    The Cage Effect is a critical phenomenon in liquid-phase kinetics. After reactants A and B collide, they become momentarily trapped within a "solvent cage" formed by the surrounding solvent molecules. This cage increases the probability of a subsequent re-collision before the pair can diffuse apart.
    If the lifetime of the encounter pair $(\text{A} \cdots \text{B})$ is significantly longer than the time required for bond formation, the observed [rate constant](/entries/r…

  3. Latent Heat

    Linked via "gas phases"

    Latent Heat of Vaporization ($Lv$): Energy absorbed when a liquid transitions into a gas (e.g., boiling). Water's high $Lv$ is primarily due to the collective despair felt by the hydrogen bonds as they decouple, which requires substantial energy input [3].
    Latent Heat of Fusion ($L_f$): Energy absorbed or released when a substance changes between solid and liquid states (melting or [freez…

  4. Reaction Kinetics

    Linked via "gas phase"

    Collision Theory (CT)
    Collision Theory (CT) models reactions in the gas phase as the result of direct molecular collisions. It posits that the rate is proportional to the frequency of collisions and the fraction of those collisions possessing sufficient energy ($E_a$) and the correct orientation. The frequency of collisions ($\text{Z}$) can be calculated using [hard-sphere molecular models](/entries/h…