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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a branch of chemistry that deals with organic molecules. Organic molecules generally have C-H or C-C bonds.
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part of your high school or college/university homework, please use this tag. It signifies that instead of a direct answer, care should be taken to explaining the steps to the solu…
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Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.
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The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.
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should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair …
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Questions relating to heat and its relation to other forms of energy in chemistry.
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The detailed and complete as possible description of plausible or observable pathways leading from reactants to products of a chemical process. This tag should be applied to questions, which seek info…
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Applications of chemistry to reagents and reactions of everyday life. This tag should not be applied to questions which are just about simple chemistry but it is specific to questions about chemistry …
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This general tag should be used if the question is about a specific (set of) reaction(s). It should be specified with other tags like stoichiometry, inorganic-chemistry, organic-chemistry, acid-base, …
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an interaction between atoms which results in release of energy. It is one of the most fundamental concepts of chemistry. Existing bonds are broken and new bonds are formed in chemi…
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The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using ele…
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should be applied to questions relating to the theory, design, techniques or performance of chemical experiments. This includes but is not limited to theoretical structures, expected products…
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the portmanteau of reduction and oxidation and therefore refers to reactions in which electrons are transferred and in consequence the oxidation state of the involved elements changes.
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The state in which both reactants and products are present at concentrations which have no further tendency to change with time.
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For questions relating to water (H2O), specifically its structure, properties, and uses in chemistry.
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The scientific study of chemical processes in living organisms, including, but not limited to, living matter.
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a subfield of quantum mechanics. Like the parent it focuses on physical phenomena that occur at an atomic scale, usually specifically aiming at chemical reactions.
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For questions relating to compounds dissolved in water and resulting reactions.
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The naming of molecules and elements, usually according to IUPAC standards, but also the accepted uses of traditional ones.
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The study of rates and steps (mechanisms) of chemical processes.
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For questions related to the solubility of compounds in various solvents, especially in water.
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should be applied to questions dealing with solutions of any kind. A solution is liquid or solid phase containing more than one substance, when for convenience one (or more) substance(s), whi…
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The branch of chemistry concerned with identifying and quantifying the chemical constituents of matter.
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Applies to long and complex natural product syntheses as much as to short one or two-step syntheses. This also covers synthetic problem sets and retrosynthetic analyses. Should not be applied to simpl…
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a measure of how acidic or basic an aqueous solution is.
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An atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. An ion consisting of a single atom is an…
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Physical and chemical laws describing the properties and behavior of gases.
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A field which implements computers to model and study chemical systems and chemical behavior, usually by approximating the Schrodinger equation for a given chemical system.
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the study of the interactions between matter and radiated energy. Experimentally, the results are returned as a function of wavelength versus amplitude (intensity), where the spectral …
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A small-scale experiment which can be undertaken with reagents readily available around the house, while observing standard laboratory safety principles and practices
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For questions relating to energy required for or produced by reactions, including questions of endothermicity/exothermicity, bond enthalpy, etc.
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Smallest particle still characterizing a chemical element. It consists of a nucleus of a positive charge, carrying almost all its mass and electrons determining its size. This tag should be applied to…
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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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Stoichiometry refers to the relationship between the amounts of substances of the reactants and the amount of substances of the formed products. This tag should be used for specific questions about ch…
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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 …
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a subatomic particle with a negative elementary electric charge.