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Related Concept Videos

Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Reaction Stoichiometry02:57

Reaction Stoichiometry

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A balanced chemical equation provides a great deal of information in a very succinct format. Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction. Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction. These quantitative relationships are known as the reaction’s...
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Measuring Reaction Rates03:09

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Classification of Titrimetric Analysis Based on Reaction Types01:01

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Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
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Calculating Equilibrium Concentrations02:05

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Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
A more...
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Chemical Equilibria: Systematic Approach to Equilibrium Calculations01:21

Chemical Equilibria: Systematic Approach to Equilibrium Calculations

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Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
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Related Experiment Video

Updated: Jan 10, 2026

In Silico Modeling Method for Computational Aquatic Toxicology of Endocrine Disruptors: A Software-Based Approach Using QSAR Toolbox
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From Reaction Stoichiometry to Life Cycle Assessment: Decision Tree-Based Estimation Tool.

Tim Langhorst1, Benedikt Winter1, Moritz Tuchschmid1

  • 1Energy and Process Systems Engineering, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstr. 3, Zurich 8092, Switzerland.

ACS Environmental Au
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

Early-stage chemical process assessment is enhanced by new regression tree methods. These tools estimate environmental impacts from reaction equations, matching cost projection accuracy for better R&D decisions.

Keywords:
chemical process designdecision treeslife cycle assessment (LCA)life cycle inventory (LCI)prospective LCA tool

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Sustainable Chemistry

Background:

  • Early-stage research and development (R&D) decision-making requires both economic and ecological insights.
  • Life Cycle Assessment (LCA) is crucial for evaluating environmental effects but often lacks prospective application in early R&D.
  • Current methods for early-stage LCA are descriptive and need enhancement to predict future process impacts.

Purpose of the Study:

  • To develop a prospective tool for early-stage Life Cycle Assessment (LCA) of chemical processes.
  • To enable environmental impact assessment using only the chemical reaction equation.
  • To provide decision-makers with ecological data comparable in accuracy to economic cost projections.

Main Methods:

  • Proposed regression trees to estimate key inputs for industry-scale life-cycle inventories.
  • Utilized chemical reaction equations as the primary input data.
  • Estimated raw material impacts, direct greenhouse gas (GHG) emissions (CO2eq), and demands for utilities (electricity, steam, natural gas, water).

Main Results:

  • Regression trees provide accurate estimations for crucial life-cycle inventory inputs.
  • The method successfully distinguishes between different chemical processes, avoiding single-value limitations.
  • Estimated inventory data demonstrates accuracy comparable to traditional cost estimations.

Conclusions:

  • Regression trees offer a robust method for prospective, early-stage LCA of chemical processes.
  • This approach allows for the integration of environmental considerations alongside economic factors in R&D.
  • Enables informed decision-making by providing reliable environmental impact data early in the R&D pipeline.