Questions tagged [terminology]

For questions regarding how something is referred to.

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Name of proton directly bonded to a functional group e.g. carbonyl

For example, a carbon bonded to a carbonyl group is the alpha carbon, and has alpha protons. Following that there are beta and gamma carbons and protons. Is there a specific name for the proton in an ...
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119 views

Why are alkenes considered nonpolar?

Alkenes have C–C sigma bonds, C=C pi bonds, and also C–H sigma bonds. I know that C–C and C=C bonds will not give any polarity, but what about the C–H bond? I think it should give some polarity ...
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450 views

Can precipitation occur in states of matter other than liquids?

This answer to Are precipitation and crystallization both analogous between chemistry and meteorology? discusses the history and use of the term "precipitation" in chemistry. From what I ...
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Are precipitation and crystallization both analogous between Chemistry and Meteorology?

A comment under the Space SE question Is there really precipitation on Mars? Does frost count? brings up the use of the term "precipitation" in chemistry and we wonder if precipitation in ...
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What is the intuition behind 'mol' as a unit 'symbol'

Why are moles written with 'mol' as opposed to something which is easier to write with one character, or even two?
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1answer
328 views

What do “USP 26” and “USP 42” mean?

I am being asked by a colleague if the Polyvinylpyrrolidone (PVP) we buy in our lab is "USP 26" or "USP 42". I've never heard those terms before. I searched up online but found ...
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1answer
167 views

How many covalent bonds are there in carbon suboxide?

Calculate the number of covalent bonds in $\ce{C3O2}$. Structure: I am confused. I can count covalent bonds as 8 by counting single-single bonds, but also I can say that there are 4 "double ...
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1answer
34 views

What are coexistent metals?

In ACS Sustainable Chem. Eng. 2018, 6 (10), 12542–12561, I saw the term "coexistent metals", but I could not find a definition for that on the Internet. So what does it mean? Karapinar et ...
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75 views

Terminologies used in isomerism [closed]

What is the difference between the terms constitutional isomers, stereoisomers, geometric isomers? I know cis and trans-1,2-dichloroethane shows cis trans isomerism and 1,1 dichloroethene, 1,1,2 ...
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134 views

What exactly are electron states?

From Tro's Chemistry: Structure and Properties [1, p. 93]: 2.5 Quantum Mechanics and the Atom As we have seen, the position and velocity of the electron are complementary properties—if we know one ...
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1answer
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What is a Herzberg?

Whatman lists the flow rates for their filters in a unit called a 'Herzberg': What is this? I've been searching around and I did find information about Herzberg flow rate testers, for example this ...
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2answers
89 views

Confusion with definitions of mass [duplicate]

What is the difference between: atomic mass relative atomic weight relative isotopic weight standard atomic weight atomic weight relative atomic mass I am told by Wikipedia that: relative atomic ...
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30 views

What is “protein redox conformation”?

From an article by Frye et al. [1]: Reduced glutathione (GSH) is the major intracellular redox buffer and is essential in free radical scavenging, redox homeostasis, maintenance of protein redox ...
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1answer
92 views

Cis and trans electrodes

I have come across use of the terms cis and trans electrodes in the context of nanopores and driving charged biomolecules through a pore using an electric field [1]: FIG. 1. Drawing of the cis ...
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1answer
538 views

What is the unit of Z effective?

Z effective is the net positive charge experienced by an electron. But what is the unit of this net charge: coulomb (C) or microcoulomb (μC), or something else?
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2answers
253 views

How can magnesium hydroxide be a strong base and be sparingly soluble at the same time?

A strong base means it completely dissociates forming $ OH^- $ ions when added to aqueous solution. Sparingly soluble means it dissolves very little when added to aqueous solution. Yet magnesium ...
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1answer
53 views

Meaning of “MS1 and MS2 resolution” and “MS1 and MS2: Unit” in a tandem mass-spectrometry parameter list

I'm translating a Certificate of Suitability that very briefly describes procedures used to measure several impurities in a drug substance. There is a short description of the parameters of a Gas ...
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1answer
71 views

Where to find a comprehensive list of chemical/biochemical etymologies?

I've found lists like this, which explain what different root words mean. But I'm looking for explanations of why those roots mean those things. For example, why does carbonyl refer to a carbon double ...
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460 views

What is an ambident substrate?

I had to identify whether a few compounds are ambident substrates or not. However, as I did not know the term, I took to googling it, but I could not find any explanation for this group anywhere. I ...
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200 views

SMILES string convertors

I'm new to SMILES strings, and have noticed that they're not standardised. Firstly, what is the reason for different structures of SMILES strings to represent the same compound? Why not have a ...
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2answers
94 views

Definition of “solution” [closed]

In my textbook “solutions” are defined as follows: Homogenous mixtures of two or more substances are known as solutions. Should the two substances always be non-reacting? The definition has no ...
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1answer
300 views

What do 'sigma' and 'pi' in front of ligands in the formula of a coordination compound mean?

The following coordination compound was given in the book Concise Inorganic Chemistry by J.D. Lee (Adapted by Sudarsan Guha) under the topic 'Effective Atomic Number (EAN)': $\ce{[Ti(\sigma -C5H5)2 (\...
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1answer
220 views

Verb for Sorption

Slightly silly question! Intuitively I want the present-simple verb for sorption to be "sorps", but saying it out loud, "sorbs" sounds much more natural. However, Google doesn't turn anything up for ...
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Naming of [Pt(py)4][PtCl4]

Why is $\ce{[Pt(py)4][PtCl4]}$ called tetrakis(pyridine)platinum(II) tetrachloridoplatinate(II) and not tetrapyridineplatinum(II) tetrachloridoplatinate(II)? I thought you use tetrakis for ligands ...
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1answer
67 views

What is the naming convention for Sn and Pb in inter-metallic compounds?

How would one go about naming inter-metallic (specifically, transition post-transition) compounds containing tin and lead? It is usually easy figuring out the naming of such compounds as they follow ...
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2answers
303 views

Why can't ligands with “locked structures” undergo chelation?

The following quote is from the book Concise Inorganic Chemistry by J.D. Lee (Adapted by Sudarsan Guha), from the chapter "Coordination Compounds", page 177: ...it must be noted that $\ce{NH2NH2}$ ...
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Can a solvent be a solid?

Can a solvent be a solid? I do not think so. But is it possible for a solvent to be a solid?
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Determining solvent and solute [closed]

On which conditions does determining solvent depend on? 1. the higher boiling indicates the solvent the material with the higher concentration is the solvent the solvent is kept first in a pot. ...
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5answers
813 views

Can a solvent be a gas?

A solvent is an element which dissolves something, basically the solute. Normally, all the solvents we encounter are in liquid phase. So, I was wondering if there could be any solvent in a gaseous ...
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Wouldn't a better term for smoking Crystal meth be condensing or vaporizing?

There isn't actually any chemical reaction taking place. The meth is heated, first it melts, then it vaporizes, but in the process it doesn't mix with other chemicals. It just merely changes state. ...
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Difference between calcination, roasting and pyrolysis

Hie everyone. I have been going through pyrometallurgical processes for recycling lithium-ion batteries and l have been coming across these terms; calcination, pyrolysis and roasting which l need ...
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64 views

What is heterogeneous catalysis in gas phase?

Give examples of heterogeneous catalysis (i) in gas phase and (ii) in liquid phase. Now, I came to know that heterogeneous catalysis involves different phases between the catalyst used and the ...
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1answer
42 views

Is it appropriate to call this material a hybrid composite? [closed]

The material I've synthesised is made up of two primary parts at a 1:1 ratio: Part 1: agar, glycerol, water. Part 2: polyurethane resin. The agar mixture on its own was too soft, so I added the ...
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1answer
55 views

Hydrogen peroxide / sodium or potassium permanganate: reaction type

I have some people on youtube stating the steam generating reaction of $$\ce{3H2O2 + 2KMnO4 → 3O2 + 2MnO2 + 2KOH + 2H2O}$$ is catalytic, from where I'm sitting it is purely stoichiometric. Can ...
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235 views

Clarification of textbook concepts relating to “perfect”, “ideal”, and “real” gases

My textbook, Atkins' Physical Chemistry, 11th edition, by Atkins, de Paula, and Keeler, says the following: The resulting expression $$pV = nRT \tag{1A.4}$$ is the perfect gas law (or ...
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1answer
287 views

Is terylene a copolymer?

Terylene is a polyester made from terephthallic acid and ethylene glycol. Even though we use two reagents, they undergo esterification to give bis(2-hydroxyethyl) terephthalate (monomer) which then ...
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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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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&...
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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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1answer
154 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
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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
272 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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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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117 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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224 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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2k 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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42 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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1answer
157 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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44 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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