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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.

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For questions relating to the energy required for or produced by reactions, including questions of endothermicity/exothermicity, bond enthalpy, etc.
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subatomic particles with the symbol e−. They have a negative electric charge (-1 elementary charge. )
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For questions about metals in general and their physical or chemical properties. For characteristic properties and reactions of d and f block metals specifically, use the [transition-metals] and [rare…
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a one-electron wavefunction, usually derived by solving the Schrodinger equation. This tag applies to questions about all forms of orbitals; additionally, questions about the constructio…
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Questions regarding chemical and lab safety. This includes questions about proper lab procedure, safe chemical handling, and such.
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In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
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should be applied to questions that deal with the particular arrangement of atoms in a molecule, the so-called molecular structure or geometry.
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For questions seeking answers deduced from or composed of theories regarding the chemical substances and about models and methods of theoretical chemistry.
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Chemical compounds that contain halogens (group 17 in the Periodic Table) as part of their chemical structure. This tag should only be applied where the halide group is one of the main focuses of the …
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Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be…
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In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid.
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For questions about synthetic or natural polymers, their chemical or physical properties, and their synthesis, etc.
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For questions about the characteristic physical properties, chemical reactions, etc. of d-block elements, group 3-12, or their compounds. Do not use this tag if your questions is about general propert…
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A laboratory method to determine the concentration of an analyte in solution. The solution volume plays a key role in the analysis.
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For questions about saturated and unsaturated alcohols, their physical properties, their reactions, etc. For questions about phenol, use the [phenols] tag instead.
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A thermodynamic state function describing the total energy content of a system.
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For questions related to the chemistry of food.
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Compounds in which at least some of bonds have ionic character stronger than covalent or metallic. Many compounds called salts are ionic compounds but not all of them.
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For questions about heat - a form of transfer of energy from one body to another or from one body to its surroundings. Also see these tags: [thermodynamics], [enthalpy], [energy], [temperature].
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uniform in chemical composition and physical state. This tag should be applied to question regarding chemical and physical properties of phases, systems of phas…
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Applied to a chemical species, the term expresses a thermodynamic property in reference to a standard, stating that one state is lower in energy than another. The tag should be applied to questions se…
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For questions about the chemical concepts of electrolysis.
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For questions about the combustion of an organic molecule or inorganic substance. Do not use this tag if your question is about the [stoichiometry] of a combustion reaction, or for the calculations …
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An electrically neutral entity consisting of more than one atom (n > 1). Rigorously, a molecule, in which n > 1 must correspond to a depression on the potential energy surface that is deep enough to c…
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should be applied to all questions about nuclear magnetic resonance, including the underpinning theory and the measurement or interpretation of spectra.
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Resonance refers to the representation of the electronic structure of a molecular entity in terms of contributing structures. The tag should be applied to any question that concern resonance structure…
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a general term for a chemical substance or a mixture of substances with certain, well defined physical properties.
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the concept of mixing atomic orbitals to form new hybrid orbitals suitable for the qualitative description of atomic bonding properties.
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a concept, which assigns hypothetical charges to atoms in compounds. This tag should be applied to questions which relate to that concept or to oxidation states in atoms of compound…
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A measure of the average kinetic energy of the particles in a sample of matter; may be expressed either in kelvin (symbol K) or in degree Celsius (symbol °C).
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For questions pertaining to software used by chemists for professional or academic purposes.
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The forces, either attractive or repulsive, that exist between molecules due to electric charges or varying electron cloud distribution.
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Questions where color (wavelengths associated with the visible region of the electromagnetic spectrum of about 400-800nm), or a color change is discussed.
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Applied to a chemical species, the term expresses a kinetic property in reference to another species. The tag should be applied to questions seeking answers with respect to the reactivity (or unreacti…
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for questions looking for a single specific, or a small number of (citable) references.