Spontaneity Prediction
Spontaneity Prediction - Related Videos
02:21
Spontaneity
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2020
A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to the earth’s...
08:06
Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster
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Cited by 16 •
2014
Drosophila melanogaster are useful in studying genetic or environmental manipulations that affect behaviors such as spontaneous locomotor activity. Here we describe a protocol that utilizes monitors with infrared beams and data analysis software to quantify spontaneous locomotor...
02:27
Predicting Molecular Geometry
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2020
VSEPR Theory for Determination of Electron Pair Geometries The following procedure uses VSEPR theory to determine the electron pair geometries and the molecular structures: Write the Lewis structure of the molecule or polyatomic ion. Count the number of electron groups (lone pairs and bonds) around the central atom. A single, double, or triple bond counts as one region of electron density. Identify the electron-pair geometry based on the number of electron groups: linear, trigonal planar,...
03:17
Measuring Spontaneous Phage Induction in Lysogenic Bacteria Over Time
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2026
Source: Krishnamurthi, R., et al. Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics. J. Vis. Exp. (2024).This video demonstrates the temporal enumeration of spontaneous phage induction in lysogenic Pseudomonas aeruginosa by quantifying viable bacterial cells (CFUs) and infective phage particles (PFUs) over time. By sampling at defined intervals during growth and analyzing both colony and plaque formation, the method reveals when spontaneous induction...
08:11
An Orthotopic Mouse Model of Spontaneous Breast Cancer Metastasis
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Cited by 83 •
2016
An orthotopic breast cancer primary tumor model and surgical removal of primary tumor to extend mouse life to generate spontaneous metastasis are described. The tumor growth and progression are monitored and quantified by luciferase fluorescence imaging.
FAQs
The sign of Gibbs free energy change provides the central prediction: a negative value favors the process under the specified conditions. Enthalpy captures heat-related change, while entropy captures change in dispersal or disorder, so their combined contribution determines the thermodynamic driving force for the process.
Temperature matters because it changes the relative contribution of enthalpy and entropy to Gibbs free energy. A process may be favored at one temperature yet not favored at another when the thermal balance shifts. Therefore, spontaneity prediction must be tied to stated conditions rather than treated as an unchanging property of the reaction.
A negative Gibbs value predicts thermodynamic favorability, not rapid completion. Reaction rate depends on kinetic barriers, which can delay or prevent observable progress even when thermodynamics favors the process. This distinction matters because a favorable prediction identifies a possible direction, whereas kinetic analysis is still needed to judge how quickly that direction may be realized.
A useful workflow starts by identifying the chemical process and its specified conditions, then considering the relevant enthalpy and entropy changes to determine the Gibbs free energy sign. The resulting prediction can be compared across temperatures or reaction conditions, helping researchers assess feasibility before selecting a process for further study.
Spontaneity prediction helps interpret equilibrium behavior by showing whether the thermodynamic driving force favors a process under chosen conditions. A negative Gibbs free energy change supports the process, whereas the sign can change when temperature or conditions change. This makes the analysis useful for comparing reaction direction and explaining why predictions may differ between settings.
Spontaneity prediction provides a thermodynamic screening tool for applications such as electrochemical cells and industrial synthesis. By indicating whether a process is favored under specified conditions, it helps researchers evaluate reaction choices, interpret chemical behavior, and consider energy-efficient process designs before relying on experimental implementation.