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1answer
26 views

Molar heat capacity and heat capacity

Is molar heat capacity and heat capacity at constant volume both represented by $C_v$? at constant pressure both represented by $C_p$?
-3
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3answers
89 views

Why is Sodium acetate called a salt of weak acid and strong base, when Acetic acid acts as a strong acid in Sodium hydroxide soln.?

Why is Sodium acetate called a salt of weak acid and strong base, when Acetic acid behaves as a strong acid (i.e. it shows almost cent percent dissociation) in Sodium hydroxide solution ?
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1answer
43 views

Why carbon is so special? [duplicate]

One special branch in chemistry is allotted to compounds of only one element (carbon). Is it justified when there are more than 115 elements and their compounds but not with any special branches?
5
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1answer
416 views

Difference between Resonance Effect and Mesomeric Effect

While studying electron displacement effects in organic chemistry, I read that the Resonance Effect and Mesomeric Effect are the same. Every source I checked used the heading or opening "The Resonance ...
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1answer
23 views

Which preposition to use for the reducing agent?

Which expression is correct when we use the prepositions with or by for indicating that the reduction is carried out using $\ce{NaBH4}$ as a reductor: It is reduced to sodium phenylselenolate with ...
5
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1answer
68 views

Why are protons in the same position in 1-chloro-4-nitrobenzene magnetically different?

Protons in ortho positions towards the nitro group are said to be magnetically different, even though they're chemically equivalent. Same goes for protons ortho towards the chlorine. Why is that so?
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1answer
58 views

What kind of reactions are these? Am I wrong?

$\ce{CaO + 2 HF -> CaF2 + H2O}$ $\ce{2NH4(OH) + H2SO4 -> (NH4)2SO4 + 2 H2O}$ $\ce{N2O5 + H2O -> 2HNO3}$ $\ce{Cu + HNO3 -> Cu(NO3) + NO + H2O}$ $\ce{Zn + 2 HCl -> H2 + ...
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0answers
42 views

What is the meaning of ‘oxyphilic’?

I read in the paper that: The reduction of diphenyl diselenide using lithium aluminum hydride generates a selenolate ion having Lewis acid character due to the oxygenophilic nature of the ...
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0answers
91 views

What is the adverb for a “hydrogen bond”?

I am looking for some opinions concerning the terminology around hydrogen bonds. Other types of bonds can be expressed as an adjective: "The atoms are bonded covalently." or (though less common) ...
2
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1answer
209 views

Is this definition of mole correct?

Chemical engineers define one mole as the amount of a substance which possess as many entities as $12\ \mathrm g$ of $\ce{^{12}C}$. The number of atoms in $12\ \mathrm g$ of $\ce{^{12}C}$ is $6.022 ...
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2answers
967 views

Why is vulcanization called “vulcanization”?

I know it might sound a dumb question but whenever I come across a note on importance of vulcanization I get stuck as to the meaning of the term and why it was adopted.
5
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1answer
167 views

Where does the name ‘aliphatic’ come from?

Generally, carbons and the hydrogens bonded to them are classified as one of the following: aromatic olefinic aliphatic (something for triple bonds I don’t know) The meaning of aromatic is rather ...
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0answers
25 views

What's the difference between pharmacotherapy and chemotherapy

Is it fair to say that pharmacotherapy (the use of pharmaceuticals to treat disease) is a subset of chemotherapy (the use of chemicals to treat disease)? If not, why? Aside from the fact the former ...
1
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1answer
28 views

What word, or phrase, do chemists use to describe the color saturation of a solution?

Outside of chemistry, I've used the word saturation to talk about how blue (or how green, red, etc.) something is. In the lab that I'm writing, I have three undesirable options: use saturation and ...
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0answers
48 views

1 degree, 2 degree, 3 degree amines are functional group isomers?

Consider $\ce{C3H7NH2}$. Can one make $3$ different isomers with this molecular formula? My question is that are they functional group isomers or chain isomers? I have been told that they are ...
4
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1answer
40 views

Terminology for “proton stripping”?

This is going to probably be an easy question for an organic chemist, but I am looking for the proper terminology to describe the following reaction mechanism. In particular, what is a more precise ...
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0answers
61 views

What is primary valency in coordination chemistry?

In Werner Theory, is primary valency the oxidation number of central metal ion/atom, or is it the total charge on the coordination sphere of the coordination compound? Different sources mention ...
15
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2answers
628 views

Orthogonal Wavefunctions

My current understanding of orthogonal wavefunctions is: two wavefunctions that are perpendicular to each other and must satisfy the following equation: $$\int\psi_1\, \psi_2\, \mathrm{d}\tau =0$$ ...
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0answers
39 views

What is the term for a compound where one element exists in two oxidation states in the same molecule?

Example nitrogen in $\ce{N2O}$ (−3 and +5). I'm pretty sure there's a term but I've forgotten what it is I thought it was disproportionation but this seems to only refer to a reaction
3
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1answer
133 views

The difference between one pot synthetic method and one step reaction

I often read in the papers of organic synthesis that the reactions can be carried out in one-pot method, and the others can be realized in one-step. I want to know the difference between one pot and ...
4
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3answers
81 views

What is the physical quantity/magnitude of pH?

I have a database to classify variables/parameters in water resources as follows: Variable: Precipitation (P); Quantity: Length; Units of measurement: mm (millimeters). Following the example, what ...
1
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0answers
29 views

Intensive properties clarification - Chemical thermodynamics

I just started learning chemical thermodynamics and have come upon the definitions for extensive and intensive properties. I had a great deal of confusion over the exact meaning of intensive ...
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0answers
227 views

What do positive, negative and zero overlap of atomic orbitals mean?

I am confused about positive, negative and zero overlaps. Do they represent the extent of overlap or are they related to the bonding and anti-bonding orbitals as described in Molecular Orbital ...
0
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1answer
31 views

Hydrates In Aqueous Solutions

Say you had copper(II) sulfate pentahydrate as a solid. In an aqueous solution, is it still referred to by its hydrated form? Is it still called copper(II) sulfate pentahydrate (aqueous) or simply ...
2
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0answers
125 views

What is the difference between reactant and reagent?

What is the difference between reactants and reagents? I've seen both used for very similar situations... The dictionary said that reagents are added to a reaction to identify another substance, but ...
0
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1answer
47 views

Chemical expression and terminology

Is this expression correct "the reaction was not accomplished " when we check the final product finding two or more spots on TLC paper ?
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0answers
45 views

Micelles absorb fat, is there an adjective for this?

"Hygroscopic" means the capacity to absorb water. Is there an adjective to describe the same idea except for the absorption of lipids? Like, when you wash your hands with soap and the soap micelles ...
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0answers
34 views

Does “leg” show B molecules in the pyramid structures?

I would like to know what the general name (in chemistry thesaurus) is for the each B molecule which is connected to A by a ...
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2answers
3k views

What is the difference between “molecular mass”, “average atomic mass” and “molar mass”?

I don't understand the difference between "molecular mass" and "average atomic mass". They seem like the same thing to me. Is it that average atomic mass is just the weighted average of the ...
1
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1answer
46 views

Saturated and unsaturated elements?

I was reading about Group 15 and came upon the following: The penultimate shell in N contains 2 electrons (saturated), in P contains 8 (saturated), in Arsenic 18 (saturated) while antimony and ...
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1answer
43 views

Can you call a table frozen?

Someone has argued that the table sitting in front of us is 'frozen'. I do agree that the table has a freezing point. The table has a melting point, but that is beyond the ignition point and the ...
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0answers
37 views

Does “parts” mean molar or mass?

Researching old (like century-old) papers it is common for chemists to describe preparations in terms of parts – e.g., "1 part water, 2 parts sulfuric acid." Is there a reliable convention on ...
1
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1answer
43 views

Difference between 'homogeneous mixture of several chemical compounds' & 'non-homogeneous system'

I just started reading Thermodynamics by Enrico Fermi; he started defining state of a system for homogeneous mixture of several chemical compounds & then non-homogeneous system as: I thought ...
0
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1answer
55 views

What does my textbook mean by saying this about petroleum?

"Petroleum consists of crude oil and natural gas and contains a mixture of up to 300 hydrocarbons, including sulfur and nitrogen compounds. It is formed over thousands of years from the remains of ...
1
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1answer
52 views

Name for HxOy compounds?

Is there a name for the class of stand alone molecules that contains oxygen, water, hydrogen peroxide, and ozone? ($\ce{O2}$, $\ce{H2O}$, $\ce{H2O2}$, $\ce{O3}$) I would not want to include hydroxyls ...
12
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5answers
1k views

Elements and atoms

First, I would like to quote sentences from a book introducing elements and atoms: An element is a fundamental (pure) form of matter that cannot be broken down to a simpler form. Elements are ...
0
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0answers
15 views

Mixture versus Distinct substance

Mixture and distinct substance, these are the two names that my book gives for the two types of matter. "Distinct substance can be subdivided into the smallest particle that still has the properties ...
0
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1answer
361 views

What is the difference between reacting and dissolving?

When one chemical is added to another how would we come to know whether the compound dissolves in it or reacts with it? For example $\ce{AgNO3}$ dissolves in $\ce{CCl4}$ whereas it could also have ...
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1answer
565 views

Are decomposition and dissociation reactions the same?

I have seen these terms being used almost interchangebly, but are decomposition and dissociation reactions the same ?
5
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1answer
143 views

Do Chemists “discover,” “invent,” or “create” things? [closed]

I am an ESL teacher, and am designing an activity to teach my engineering students the differences between the words "invention," "discovery," "innovation," and "creation," words that are often ...
5
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0answers
44 views

Hydride shift reaction

How is this hydride shift reaction type called? I think it's not one of following types: cycloaddition (Diels Alder) electrocyclic ring opening sigmatropic rearrangement ene reaction cheleotropic ...
3
votes
1answer
180 views

What are the units of 85000 Molecular Weight of a polymer

I have a PVA bottle, which says that the molecular weight (Mw) of PVA is between 85000 - 124000. I know that this means that there are repeated chains of the PVA monomer, but what are the units to ...
4
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0answers
28 views

What is the relationship between the two definitions of the difference between basicity and nucleophilicity?

(Clarification: this is a question about terminology, not so much about when to use different concepts. I think I do understand which characteristics of a species to use when trying to determine ...
1
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1answer
89 views

Ignition of concrete and sand by chlorine trifluoride

Concrete and sand are highly unreactive to most of the chemical attacks. But chlorine triflouride is so dangerous that it will ignite concrete, sand and other fire retarding substances. Which property ...
2
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1answer
205 views

Difference between catenation and allotropy

Can anyone tell me what the difference between catenation and allotropy is? I would like the basic explanation.
1
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1answer
69 views

Preparation of sulfuric acid through Contact process

In the preparation of $\ce{H2SO4}$ through the Contact process, $\ce{H2SO4}$ is added to hot sulfur trioxide to form oleum. This oleum is then diluted by adding water to form $\ce{H2SO4}$. ...
2
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0answers
49 views

Difference of aggregate and cluster?

Can anyone tell me the difference of aggregates and clusters from the molecular point of view? Thank you so much.
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0answers
26 views

meaning of hydrodynamic dimension

Can anyone tell me what the meaning of hydrodynamic dimension is and the relations between hydrodynamic dimension and hydrodynamic radius? Thank you so much.
8
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1answer
158 views

How can rotamers of alpha-keto esters be named to distinguish between different geometries?

When talking about free rotation it is often helpful to determine about which geometric arrangement one is referring to. For example in the case of butane we talk about several eclipsed or staggered ...
4
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1answer
161 views

Quick and simple explanation of molar mass, molecular mass and atomic mass

As a physics student, I hardly deal with such quantities and when I do, I blunder through. I think it’s a good time to be given a good explanation for these since I’m in a class of Nuclear physics. I ...