Questions tagged [terminology]

For questions regarding how something is referred to.

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Definition of a Homologous Series

My textbook states that members of a homologous series have the same general formula (ex. $\ce{C_{n}H_{2n}}$ for alkenes) as they only differ from one to another by additional $\ce{CH_2}$ (methylene) ...
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34 views

What is the significance of the downward arrows in energy level diagrams in organic chemistry?

The following text is from Solomons, Fryhle and Snyder Organic Chemistry Third Edition, chapter 1 "The Basics: Bonding and Molecular Structure", page 13, topic 1.5 "Resonance Theory", sub topic 1.5B "...
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87 views

What is “salpotricon”? [closed]

I read in my old Polish history handbook about the black powder recipe that was taken from some medieval manuscript, if I remember correctly. One of the ingredients was called “salpotricon”, but years ...
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137 views

As adjectives, not in a math context: 'different' vs 'differential' [closed]

I looked up differential, but still don't savvy why the books below use 'differential' rather than 'different' and vice versa. Advanced Organic Chemistry: Part A: Structure and Mechanisms by Francis ...
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1answer
29 views

Is there any difference between medical and cleaning ozone?

What are the main differences between medical ozone (auto-hemotherapy, …) and cleaning ozone (for example, the kitchen cleaning devices for vegetables and food). I noticed that they can produce a ...
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1answer
140 views

Origin of the term “millamolecule”

I came across a term "millamolecule" to represent macrocycles with a molecular weight between 500 and 1,000 daltons. Google Scholar show several resources which use this term e.g., Google Scholar ...
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What does environmental factor include?

Does E-factor include all of the reagents including catalysts, solvents, and reactants that go into making the product? Further, in the E-factor calculation should all the solvents used in work-up (...
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4answers
3k views

What is a word for “atom or molecule”?

What is a word for "atom or molecule"? As in: "The entry of an atom or molecule across a cell membrane into a cell is dependent on its size and solubility." This keeps coming up, and it's really ...
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1answer
50 views

Difference between neutral and amphoteric oxides

What is actual difference between neutral oxides (e.g. $\ce{NO},$ $\ce{N2O},$ $\ce{CO})$ and amphoteric oxides (e.g. $\ce{Al2O3})?$ I got a hint of it from the comment of Ivan Neretin.
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2answers
157 views

Use of Concentration for pH

When we find the pH of a solution, do we use normality or molarity? My teacher said that if the compound is present by itself, we can use normality but in all other cases we should use molarity. Can ...
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381 views

What is considered room temperature in Celsius?

Recently, I have seen room temperature listed at 20 °C and 25 °C. Which one is more accurate for use in chemistry problems?
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38 views

How are atomic masses determined? [closed]

The atomic mass (ma) is the mass of 1 atom of an element. Elements have isotopes. Therefore, there must be an atomic mass (ma) associated with each isotope of an element. How do we know the atomic ...
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66 views

Difference between the terms “analyte” and “analyate” and their applicability

“Analyte” is the term that is usually universally understood and is listed in IUPAC Gold Book: analyte The component of a system to be analysed. However, recently I stumbled upon the word “...
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40 views

Can a compound with indirectly bonded carbon and silicon atoms within the same aromatic system be called organosilicon compound?

Wikipedia says that organosilicon compounds are organic compounds with carbon-silicon bonds. Does the class of organosilicon compounds include compounds in which the carbon and silicon are only ...
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1answer
182 views

Meaning of the term “vertex” in the topic of skeletal formulae

From the Wikipedia article on skeletal formula: Hydrogen atoms attached to carbon are implied. An unlabeled vertex is understood to represent a carbon attached to the number of hydrogens required ...
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1answer
189 views

What does “parallel in-register” mean for a protein structure in a fibril?

I read a paper by Ross and Poirier [1, p. S12] which has the following lines (see section Commonalities of amyloid structure) that describe the structure of protein in a fibril: The most ...
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2k views

What is the scientific term to describe the operation of a bong?

What is the scientific term for the separation of dust particles from air by suction through a specialized flask in a way similar to the operation of a bong? The thing that led me to this was a ...
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2answers
55 views

What does bulk mean when talking about polymers? [closed]

I recently read a paper by Lyulin et al. [1] where they talk about thin films and bulk polymers, I just don't quite understand what they mean by "bulk". Can someone please explain? References ...
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241 views

How is the distance between m/z axis values in mass spectrums called?

The output data of mass spectrometers is relative intensity (y axis) over m/z (x axis). How is the distance between m/z values on the x-axis called (in case of centroided data and profile/raw data ...
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1answer
63 views

Grammar of elimination reactions

I would like to double check the English grammar of a sentence of an elimination reaction, but I cannot find an answer. I'd normally say "the elimination of A with X as the leaving group", where A is ...
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108 views

Why are IUPAC's definitions of exo- and endothermic disconnected from the direction of heat flow?

I'm wondering if anyone can provide a rationale for IUPAC's definitions of exothermic and endothermic, since they disconnect these terms from the direction of heat flow. Specifically, here are IUPAC'...
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1answer
52 views

What is the definition of a “Simple enzyme” exactly? Is it an enzyme that does not require a co-factor?

I'm having a hard time making a distinction between simple and complex enzymes. the definitions I've found so far all say this: Simple enzymes are enzymes that are only made out of protein, and ...
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219 views

Terminology of atomic spectroscopy: Difference Among Term, States and Level

In A Primer on Quantum Numbers and Spectroscopic Notation Contents, the concept of a term and level is described as a) The level is the set of 2J+1 states with specific values of L, S, and J. ...
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304 views

Is scandium considered a transition metal?

I have seen so many conflicting answers to this question in various places so I wanted to ask it again. IUPAC defines a transition element as an element whose atom has a partially filled d sub-...
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1answer
52 views

What is a “ynoate” in the context of alkynes?

In the literature, I have read the term, "ynoate" refer to a sort of alkyne. Searching through the IUPAC gold book and Google has failed to return an explicit definition.
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70 views

Crystallographic terminology associated with the honeycomb structure

I'm trying to quickly learn basic crystallographic principles in 2D under pressure (it's me whose under pressure, not the lattice) so I'm checking many sources to find those that "speak to me" the ...
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1answer
80 views

Difference between relaxation and resonance leading to an absorption spectral feature?

I need help understanding the physics behind this insightful comment below the question Does water really have strong EM absorption at 3 kHz in solid and 2 GHz in liquid? Why the huge shift?: ...
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79 views

How to distinguish mass concentration and density?

I am writing a proof where I have to mention both with density and of a material and mass concentration (mass/volume) of a material. I am using the letter $\rho$ to represent density, and I didn't ...
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3k views

Is an acid a salt or not?

In our office, we discussed today what the exact definition of a salt is and whether an acid itself can be classified as a salt. Our first problem was that we couldn't get a definitive definition for ...
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1answer
140 views

Which is the correct definition for metamers (or metamerism)?

I have heard two definitions of metamers. Compounds having the same molecular formula but different number of carbon atoms on either side of the functional group. Compounds having the same molecular ...
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98 views

Difference between base-promoted and base-catalysed

Why is halogenation of ketones in base described as being "base-promoted" and not "base-catalysed"? If the reaction is not "catalyzed" then how is the base used up?
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What is it mean by Grade in thermoplastics?

I have seen some thermoplastics of the same type categorized by its grade .. What does it mean by that? What does it means the word grade in this context? Is it just a name for slightly differences ...
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202 views

Does ethanol “decompose” or “remove” phosgene from chloroform?

A question I was asked was: "Why is ethanol added to chloroform bottles?". I know that chloroform can be slowly converted to poisonous phosgene gas, and that ethanol is added to prevent phosgene ...
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37 views

What is the term for passing an eluate back through an adsorption column?

In my experiment I am passing a solution through an adsorption column, collecting the eluate, then passing the eluate back through the same column. Is there a concise term which describes this ...
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3answers
586 views

Is there a difference between dipole and dipole moment?

I’m confused as to whether both terms “dipole” and “dipole moment” are the same or different, does the moment have something to do with the molecular geometry? I know the vectors of the charges cancel ...
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1answer
126 views

What is a molecule’s smallest set of smallest rings?

It is been a while since I've studied chemistry. Now, I am reading the documentation of RDKit, where they mention the expression "smallest set of smallest rings" (SSSRs). I understand that a ring is a ...
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1answer
45 views

Learning chemistry in a new language [closed]

I'm from Slovakia, 16 and like chemistry a lot. I want to pursue it in the future but there aren't any good universities here where you can get a Ph.D. in chemistry so I want to go abroad, preferably ...
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76 views

Can a protein complex be a machine? [closed]

Discussing an article with friends we began discussing whether a protein complex that punches holes in cells (membrane attack complex) would be considered a machine. Now, my friends are biochemistry ...
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859 views

“Estrontium” on poster

I was looking at a poster for an international chemistry olympiad. Its background contains some random elements as periodic table tiles. One of them said "Estrontium." A google search returned ...
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46 views

Atomic number ranges in “integral units”?

My textbook says the following: For an electrically neutral or complete atom, the atomic number also equals the number of electrons. This atomic number ranges in integral units from 1 for hydrogen ...
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103 views

What, if any, are the differences between radical scavenging and radical quenching?

Hindered amine light stabilizers (HALS), introduced in the 1970s, function mainly as free radical scavengers, although they also may act as quenchers or peroxide decomposers. (Polypropylene: The ...
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78 views

Jacobi coordinates - definition

I became quite confused about Jacobi coordinates. Until now I've been used to them as the coordinate system, where coordinates are vectors pointing to the center of mass of previous "subsystem", as we ...
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1answer
145 views

IUPAC Recommendations for Concentration Units (ppb, ppm)

In a recent interesting post, (Is 1 ppb equal to 1 μg/kg?) it was pointed out that IUPAC advises to abandon parts per million, parts per billion quantities and instead it suggests to employ micromole/ ...
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37 views

What is meant by the term composition in chemistry [closed]

This may seem trivial at first glance, but It is used a lot in introduction to chemistry chapters and so I need to understand what they mean by composition. Yes, I have seen the google definitions, I ...
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156 views

What is the name of “cis/trans” isomerism when all four groups are different?

How would you call a pair of isomers on the picture below? They look a lot like regular cis/trans isomers, except all four groups are different. I can tell they are spacial isomers (stereoisomers) ...
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1answer
75 views

What are “O-hydrocarbons”? A pharma translator's question (Russian to English, “О-углеводороды”)

A translator colleague is translating from Russian a plan for study of a number of leachable and extractable substances (pharmacology). This Russian text mentions one particular class of chemicals ...
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57 views

Standard abbreviations for polycyclic aromatic hydrocarbons, similar to those for nucleic and amino acids?

The Nature paper Characterizing particulate polycyclic aromatic hydrocarbon emissions from diesel vehicles using a portable emissions measurement system addresses polycyclic aromatic hydrocarbons (p-...
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1answer
303 views

Do all polymers contain either carbon or silicon?

Is either carbon or silicon present in every known polymer? If not, is there a small group of elements that, between them, are present in every known polymer, or can polymers be based on a lot of ...
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641 views

Is there a name for this algorithm to calculate the concentration of a mixture of two solutions containing the same solute?

There is an algorithm called "Mischungskreuz" (German for "x of mixing") that is sometimes taught as a shortcut to figure out the following problem: You have two solutions that contain a solute at ...
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1answer
29 views

How do amphoteric compounds act as acids? [closed]

According to my chemistry textbook, an acid is a compound that gives hydronium ion on dissolving in water but amphoteric compounds like ZnO do not yeild hydronium ion on dissolving in water . I ...