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Questions tagged [terminology]

For questions regarding how something is referred to.

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2
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1answer
62 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 ...
7
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0answers
97 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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25 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 ...
11
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2answers
176 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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1answer
96 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 metal as: "an element whose atom has a partially filled d sub-...
0
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1answer
50 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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56 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 ...
3
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1answer
67 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?: ...
0
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1answer
30 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 ...
11
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3answers
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 ...
4
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1answer
83 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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0answers
41 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 ...
0
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1answer
127 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 ...
1
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1answer
35 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 ...
1
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3answers
263 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 ...
2
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1answer
88 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 ...
2
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1answer
44 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 ...
4
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1answer
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 ...
6
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1answer
855 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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1answer
42 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 ...
4
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0answers
74 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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0answers
52 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 ...
2
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1answer
99 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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1answer
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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1answer
83 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) ...
4
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1answer
69 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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0answers
50 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-...
2
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1answer
298 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 ...
11
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1answer
601 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 ...
13
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2answers
1k views

Is there a difference between equilibrium and steady state?

The term equilibrium is used in the context of reversible reactions that reach a point where concentrations no longer change. The term steady-state is used in enzyme kinetics when the concentration of ...
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2answers
56 views

I am not able to get the exact definition of a solution [duplicate]

A substance which is in larger proportion by mass is called solvent and which is in lesser proportion is called solute. What if the volume of the substance with lesser mass is more. Will it still ...
5
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0answers
50 views

Is there a particular name for a Hill formula or sum formula omitting hydrogen?

Often, single-crystal X-ray diffraction analysis determines the non-H atoms first, and eventually puts hydrogen atoms "as riding" on idealized positions in respect to heavier atoms (e.g., C, O, N), ...
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1answer
192 views

Meaning of red heat

I have two reactions below. What is the difference between red heat and normal heat? Is it related to iron as a catalyst when it is red hot?
1
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1answer
45 views

Apparent contradiction in the name of group 2 elements

From my understanding (I might be very wrong), the "earth" in alkaline earth metals means non-metallic, insolube in water and resistant to heating, therefore the oxides and hydroxides of group 2 ...
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2answers
82 views

What is meant by forward reaction?

While reading my chemistry textbook I came across the phrase: forward reaction is favoured by decrease in temperature in exothermic reactions. I was tripped off by the term 'forward reaction', can ...
2
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1answer
530 views

What exactly is a reducing equivalent and what does it do?

I've encountered this term in the context of cellular metabolism, but I can't seem to find an explanation of what a reducing equivalent is or why it is named this way. Wikipedia was not really helpful,...
5
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1answer
126 views

What is chemical decomposition in the context of a crystal or amorphous solid?

The IUPAC Gold Book definition of chemical decomposition is: The breakdown of a single entity (normal molecule, reaction intermediate, etc.) into two or more fragments. That is a very general ...
6
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1answer
158 views

What's the difference between “extent of reaction” and “position of equilibrium”?

My chemistry textbook defines the terms in question as follows: Extent of reaction: the relative amounts of products compared with reactants. The extent of reaction is indicated by the value of the ...
0
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1answer
74 views

Is the water in an aqueous solution undergoing a reaction considered part of the system or surroundings?

System: In chemistry, a system is a chemical reaction. A system operates within its surroundings. Energy can move between the two. Surroundings: The environment around a particular chemical reaction....
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2answers
101 views

Sugar: A molecule or crystal [closed]

Is sugar a molecule or a large crystalline structure composed of many molecules? What do we mean when we say sugar?
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6answers
11k views

Why do we call O2 oxygen? [closed]

I have been taught that oxygen is a chemical element, in other words a certain type of atom that has 8 protons in its nucleus. So why is O2 called oxygen? It is not a type of atom but rather a ...
19
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4answers
3k views

Is an isobar the same as an isotope?

I am a little bit confused about what an isobar is. Its online definition is that it's an element with the same number of neutrons but a different number of protons from an element $\ce{X}$. To me, ...
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0answers
455 views

How do you call the opposite of an ion?

According to IUPAC, an ion is defined as: An atomic or molecular particle having a net electric charge. (source) But how do you call an atomic or molecular particle that does not have a net ...
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0answers
55 views

Is there a single word antonym for dissociate? [closed]

Teaching ionic and covalent compounds, and one of the differences is that some ionic compounds will dissociate when dissolved but covalent compounds usually do not (salt water vs. sugar water, just ...
0
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1answer
33 views

How to quantify the adsorption affinity of gases?

Is there a term/quantity which shows how 'sticky/adsorptive' a molecule is? I am interested in gas adsorption on steel surfaces in our mass spectrometer and would like to estimate which gases have a ...
2
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1answer
21 views

Can two atoms with the same amount of electrons but differing electronic configurations be considered isoelectronic?

Can two atoms with the same amount of electrons but differing electronic configurations be considered isoelectronic? For example, would we consider yttrium(I) $(\ce{Y+})$ with configuration: $\ce{[Kr]...
4
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1answer
509 views

What is “mechanistic duality”?

I am doing a general overview of different kinds of dualities present in science. I am quite well versed with the dualities in physics and mathematics. I was searching for dualities in chemistry, ...
0
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3answers
128 views

What makes Citrate or Citric Acid an acid?

As far as I know, an acid is something that gives off a proton or hydrogen ion $H^{+}$. But when I look at Citric Acid, There are three $COO^{-}$, which I think is a carboxyl group, that lacks $H^{+...