A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

For questions relating to organic compounds which contain a bond between a carbon atom and a metal.
164 questions
For questions about the dipole moment of a bond or a molecule; its calculation, comparison with other bonds or molecules, affect on molecular properties, etc.
Questions on the harmful effects of various substances on the human body, or biological organisms in general.
157 questions
a quantum mechanical model used to estimate the electronic structure of molecules and condensed matter. In broad terms, DFT works by treating all the electrons in th…
157 questions
highly reactive species, that have one or more unpaired electrons. Whether a species has unpaired electron(s) can be experimentally determined through electron pair resonance spectroscopy…
152 questions
For questions about purification - the process of rendering something pure, clean of foreign or undesired elements. Not to be confused with [metallurgy] or [chromatography].
150 questions
For questions about the definition and usage of units of measurement.
149 questions
For questions regarding the separation process consisting in the separation of a substance from a matrix. This tag can be used for generic extraction of elements from ore or more specific types of ext…
148 questions
For questions about the reduction potential (A measure of the tendency of a chemical species to acquire electrons and thereby be reduced) or its applications. Also see the tag [electrochemistry].
148 questions
For questions relating to the structures, properties, production methods and potential hazards of polymer materials commonly known as plastics
145 questions
A material's ability to conduct electric current or thermal energy by any means.
145 questions
For questions related to the chemical reactions and processes that result in a chemical reaching its solid phase.
Questions about how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds when a molecule is formed.
143 questions
A method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution.
141 questions
should be applied to questions about structural diagrams - diagrams used to show the crude location of possible existent bonds and lone pairs of electrons in a chemical species. Do not use th…
140 questions
Questions regarding the development and exploration of chemical ideas, innovations, and discoveries.
138 questions
substances or combinations used to diagnose, cure, treat, or prevent disease.
The ionization energy of an atom or molecule describes the minimum amount of energy required to remove an electron from the atom or molecule in the gaseous state. Do not confuse with [electron-affinit…
127 questions
Cheminformatics involves the production, processing, filtering, and searching of chemical information. This includes chemical databases, computational screening, searching, etc.
Questions related to the chemical and physical influences that influence the rate and probability of chemical reactions. Not to be confused with [catalysis] or [reaction-mechanism].
126 questions
For questions about the valence shell electron pair repulsion (VSEPR) theory, in topics of: estimation of bond length, bond angle, bond energy, etc.; determining hybridization of atoms, or shape and g…
124 questions
Hydrolysis refers to any reaction with water. For example, it may be said that ammonia hydrolyzes in water to produce ammonium ion and hydroxide ion.
124 questions
Questions asking for identification of compounds in photos, by description, or given by a formula.
121 questions
Questions related to color as well as the reflecting and refracting properties of chemicals.
120 questions
for questions regarding the principles and application of infrared spectroscopy.
120 questions
biopolymers consisting primarily of polycondensated amino acids.
119 questions
should be applied to questions about the various allotropes of carbon and their physical or chemical properties. Most important modifications are diamond, graphite, fullerenes, graphene and n…
117 questions
should only be applied where the effects are specifically related to variance in mass number with the same atomic number (existence of isotopes). Examples include: radioactivity and other nuc…
117 questions
For questions concerning crystalline structures and their properties.
For questions involving (theoretical or experimental) comparison of density of elements or substances, calculating density of solutions, effects of temperature on density, and other chemical aspects o…
113 questions
For questions about the synthesis, properties, and reactions of ester compounds, both organic and inorganic.
113 questions
For questions about reduction reactions in organic chemistry, where a molecule of interest is reduced. Do not use for questions on general redox concepts.
111 questions
For questions concerning compounds possessing rings with two or more different types of atoms.
110 questions
Questions regarding fuels and the properties of fuels, like calorific value, octane number, mechanism of combustion, etc., should use this tag.
109 questions
For questions about determining the paramagnetism, diamagnetism, etc. of chemical species and other chemical applications of magnetism. Note that questions oriented towards physical aspects of electro…
109 questions
For questions about cleaning agents and methods used to remove dirt, stains, residues, and bad smells, including proper waste disposal. For particular questions about surfactants, use the [surfactants…
108 questions
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