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Molecular Compounds: Formulas and Nomenclature03:10

Molecular Compounds: Formulas and Nomenclature

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Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
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Classification of Elements and Compounds02:54

Classification of Elements and Compounds

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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
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Chemical Formulas02:52

Chemical Formulas

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A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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Molecules and Compounds02:38

Molecules and Compounds

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Atoms and Molecules
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Synthesis and Decomposition Reactions02:17

Synthesis and Decomposition Reactions

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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

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The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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Related Experiment Video

Updated: Jul 12, 2025

Standardized Identification of Compound Structure in Tibetan Medicine Using Ion Trap Mass Spectrometry and Multiple-Stage Fragmentation Analysis
09:24

Standardized Identification of Compound Structure in Tibetan Medicine Using Ion Trap Mass Spectrometry and Multiple-Stage Fragmentation Analysis

Published on: March 17, 2023

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Mythical compounds.

Phillip E Fanwick1

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.

Acta Crystallographica. Section C, Structural Chemistry
|October 24, 2023
PubMed
Summary

Chemists should verify crystal structure data consistency. A recent study highlights the need to ensure reported crystallographic data aligns with established chemical principles for reliable scientific reporting.

Area of Science:

  • Crystallography
  • Chemistry
  • Data Science

Background:

  • Ensuring the quality and consistency of reported scientific data is crucial for reliable research.
  • Current validation methods may not always sufficiently scrutinize crystallographic data.
  • The chemical context of crystal structures is often overlooked in validation.

Purpose of the Study:

  • To alert the scientific community, including chemists, crystallographers, referees, and editors, about potential issues with crystal structure data.
  • To emphasize the importance of validating not only the structural integrity but also the chemical plausibility of reported crystal structures.
  • To advocate for a more thorough approach to data validation in crystallography.

Main Methods:

  • Review and analysis of existing practices in crystallographic data reporting and validation.
Keywords:
atom misassignmentscheckCIFcrystallographic errorsdisordered guest moleculesincorrect cell sizeincorrect modelingincorrect space group

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Multi-step Preparation Technique to Recover Multiple Metabolite Compound Classes for In-depth and Informative Metabolomic Analysis
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  • Highlighting specific concerns raised by Raymond and Girolami regarding trust in crystal structure data.
  • Discussion of the necessity for cross-verification between crystallographic findings and chemical knowledge.

    • Main Results:

    • Crystal structure data should not be accepted at face value without critical assessment.
    • There is a demonstrated need for improved validation protocols in crystallography.
    • Chemical consistency checks are essential for robust data quality assurance.

    Conclusions:

    • Scientists must critically evaluate reported crystal structures.
    • Integrating chemical knowledge into crystallographic data validation is paramount.
    • Adopting a more rigorous approach will enhance the reliability of scientific publications.