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2
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1answer
26 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
votes
0answers
19 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 ...
0
votes
1answer
57 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
votes
1answer
32 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
vote
1answer
21 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 $\ce{H2SO4}$. ...
0
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0answers
22 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
136 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
votes
1answer
52 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 ...
1
vote
1answer
30 views

Is there a term that denotes 'molecules and molecular constituents'?

In my notes, I've used phrases such as 'atom, particle, or molecule' more often than I'd like. For example, Wikipedia defines atomic mass as the mass of an atomic particle, sub-atomic particle, ...
1
vote
1answer
173 views

What exactly does gram atoms means?

Wikipedia says :  The term gram-atom (abbreviated gat.) has been used for a related but distinct concept, namely a quantity of a substance that contains Avogadro's number of atoms, whether ...
3
votes
1answer
42 views

Is it correct to say that dehydration isn't a subset of condensation?

To my understanding, dehydration is defined as a subset of a condensation reaction. A condensation defined as being two molecules joining together (in the case of loss of water, this is referred to as ...
1
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0answers
72 views

Chemical writing: the term “synthesis route” [closed]

Can someone tell me, which of the following terms should be used or avoided? (Google shows the presence of all the candidate terms.) synthesis route synthetic route route of synthesis synthesis ...
3
votes
1answer
53 views

Name for carbon and boron groups?

So group 17, 16, and 15, are called the halogens, chalcogens, and pnictogens respectively. Is there a name for the groups 14 and 13? (I really don't know if this is on topic here if it isn't tell me ...
2
votes
1answer
20 views

What is the significance of an organic compound's M peak?

Background On the topic of identifying an organic compounds using peaks generated in Mass Spectrometry, a rule of thumb expressed in the UK educational textbook, CGP, is that that "the M peak is the ...
0
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0answers
10 views

SDS-PAGE container terminology

Is there a specific name for the overall container that the gels, glass plates, sample buffer, all go in, the whole contraption?
4
votes
1answer
38 views

Dilution terminology

For thing like 8× dilution, that would be like 1 ml of a solution and then 7 ml of something like water to dilute right? Would 50 ml solution and 50 ml water be a 2× dilution? I’m a bit unsure about ...
3
votes
2answers
59 views

How to report pH values?

I have measured the pH in the water-soluble fraction of a powder. I weighed in a certain amount of powder and a certain amount of water, and extracted the water-soluble fraction. I then measured the ...
5
votes
1answer
27 views

Is the term carboreduction interchangeable with carbothermic reduction

I am currently studying reactions involving the reduction of metal oxides by carbon at high temperature to produce refractory carbides (such as $\ce{ZrC}$) following equations such as: $$\ce{ZrO_2 + ...
5
votes
2answers
233 views

What is actually a redox reaction?

I need to know what a redox reaction is. How could a redox reaction possibly be identified? Also, I have a confusion whether, $$\ce{H -> H+ + e-}$$ $$\ce{e- + Cl -> Cl-}$$ $$\ce{H + Cl -> ...
4
votes
1answer
118 views

What does it mean if a functional group has “higher priority” in terms of IUPAC naming of organic compounds?

What does "higher priority" mean exactly in the following statement from this wikipedia article (article name: "E-Z notation") on naming organic compounds in IUPAC nomenclature of organic compounds? ...
5
votes
1answer
197 views

Is there a name for the opposite reaction to the dissolution?

When atmospheric $\ce{CO2}$ reacts with water to form $\ce{H2CO3}$, this is called dissolution, isn't it? What term would you use for the opposite reaction when it occurs at atmospheric pressure (e.g. ...
0
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1answer
35 views

Significant Figures: To expand or not to expand? [closed]

4 * (2 + 2) = ? 4 * 4 = 20 (rounded to 1 significant figure) OR 4 * 2 + 4 * 2 = 16 2.0 * (0.5 + 0.5) = ? 2.0 * 1.0 = 2.0 OR 2.0 * 0.5 + 2.0 * 0.5 = 2
2
votes
3answers
162 views

When the terms diphosphate and pyrophosphate are used?

I read on Wikipedia article about pyrophosphate and it stated that pyrophosphate is also called diphosphate.But for example, why ADP is apparently called Adenosine Diphosphate but not Adenosine ...
3
votes
1answer
2k views

Definition of major, minor, and trace elements in analytical chemistry

What is the definition of major, minor, and trace elements in a sample? I am unable to find this anywhere on the internet. Is it something like: Major elements are those > 0.1 % Minor elements are ...
3
votes
2answers
765 views

What does oxidizing strength mean?

What does oxidizing strength mean? Does it mean the strength of a oxidation agent that is needed to oxidize the reduction agent, or does it just mean the tendency of a substance to lose electrons ...
5
votes
2answers
260 views

What is the word for how polyprotic an acid is?

What is the word to describe the number of acidic hydrogens an acid has? I am currently thinking something like "proticity", but I am not sure The use case world be for a table of things like this: ...
2
votes
2answers
304 views

Why is mercury used in thermometers?

I know it expands when hot and grows compact when cool (that's about all I know), but I suppose many other substances do, too. Also, and excuses for my ignorance, what the term used to describe the ...
2
votes
1answer
56 views

What is molecular system in general terms? What is a supramolecular system?

What is a molecular system in general terms? Could the solution of sugar in water be called a molecular system, if we were not interested in sugar-water interaction? Today Jean Marie Lehn told me ...
0
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2answers
92 views

Why is it written as “joule” and “J”?

Why is the unit joule is written as "joule" and "J", I mean what does "J" mean and what does "joule" mean.
6
votes
3answers
518 views

Why is introductory chemistry so non-rigorous?

In introductory chemistry books, courses, ... Many "definitions" contain words like: typically, most, often, likely, generally. I read since questions on this site mentioning different definitions ...
4
votes
1answer
30 views

What is the term for the amount of volume change at a phase boundary?

Apologies for the extremely basic question, but I would like to look up the amount by which the volume (or equivalently, density) of various substances changes when they freeze. However, I don't know ...
4
votes
2answers
4k views

What's Standardization, and why do it?

Surprisingly, there are very few resources online (outside of obscure lab pages) that explain exactly what standardization is (not even Wikipedia!). The context is the phrase standardize the titrant ...
0
votes
1answer
35 views

The proteins “eluted” or “were eluted”?

In describing proteins, I've written "the proteins detached from the [Ni-IDA] matrix and were eluted from the column" Should I use "were" or can something simply "elute" ?
2
votes
1answer
12k views

What's the difference between enthalpy of combustion and heat of combustion?

Wikipedia has two different pages for enthalpy of combustion and heat of combustion. Their definition is the same and they use the same symbol $\Delta H_c^\circ $ It says that enthalpies of ...
-2
votes
1answer
56 views

Thermodynamics terminology

For the reaction $\ce{2C(s) + 3H2(g) -> C2H6(g)}$ , $\Delta H=-82 \text{ kJ/mol}$ , the amount of heat, which will be given out in the formation of 30 g of ethane will be a) −82 kJ b) ...
1
vote
0answers
246 views

Difference between inorganic and organic semiconductors: electronic structure or configuration, or?

Organic semiconductors differ from inorganic semiconductors. In organic semiconductors the molecules are held together by weak van der Waals interactions and in inorganic semiconductors by covalent ...
2
votes
2answers
65 views

What does the commercial chemical composition notation “Percent dry, wet with water”mean?

I am not a chemist, I develop software. I'm hoping for a general explanation I can understand in order to assist me with a project I'm working on. Customers viewing a product online such as peroxide ...
1
vote
2answers
62 views

Redox reaction terminology

In the case of this redox reaction: $ \ce{ Cu SO_4 + Zn → Zn SO_4 + Cu} $ Is it correct to say that the sulfate reduces to the zinc? Or is it the whole molecule that is reducing? Or just the copper? ...
1
vote
1answer
100 views

Significant Figures in almost-scientific notation

For a homework assignment on significant digits, I have to find the number of significant digits in the number $0.40 \times 10^3$. I know that in scientific notation, the number of significant digits ...
2
votes
1answer
793 views

Difference between the terms “autocatalysis” and “(branching) chain reaction”

Is there a technical difference between the terms "autocatalysis" and "branching chain reaction"? They both seem to refer to something very similar, namely sequences of reactions in which one of the ...
7
votes
2answers
6k views

What is the difference between graphite oxide and graphene oxide?

I am considering making a sheet of graphene using the LightScribe technique and I have read that I need graphite oxide. However when I look up graphite oxide for sale, graphene oxide pops up. Are ...
3
votes
1answer
85 views

Is there a specific term for reactions of the form A + B → C + D?

I'm working with an abstract model of chemical reaction networks. In this model, some of the reactions have the form $\ce{A + B <=> C}$ and others have the form $\ce{A + B<=>C + D}$. I'm ...
0
votes
1answer
31 views

What is the difference between a chemical state and just a combination?

I don't think a combination also can be called a "state" i.e. that the chemical state of vapour or solid would be just a combination. When I read Wikipedia about "chemical state" it refers to just a ...
8
votes
2answers
165 views

Significant Figures Interpretation

Please correct me if I’m wrong, but I’ve read that the reason why we use significant figures is to avoid making the result of a calculation more accurate than the starting values prior to the ...
5
votes
2answers
1k views

Basic Understanding of Relative Atomic Mass

I’m currently trying to learn some chemistry and have run into some trouble understanding some of the basics. The confusion stems from a passage in my textbook, so I will list the brief passage and ...
4
votes
1answer
225 views

What is a “lagged bath”?

First question, and this is one I've searched for in vain. In the context of setting up cooling baths, I've come across the term "lagged" bath. I cannot extract what this means from any available ...
2
votes
1answer
63 views

What is a 'Trace Crossing'?

I'm reading about electrodeposition of conductive polymers in a chemistry textbook, and the author mentions 'trace-crossing' in the 'potentiodynamic response'. From the context I can figure out that ...
13
votes
4answers
28k views

What is the definition of of 'compound', 'mixture', 'element' and 'molecule'?

I am looking for the precise definitions, as I am very confused as to what they are exactly, because although I mostly understand what they mean, I have encountered some conflicting definitions that ...
4
votes
2answers
94 views

Correct nomenclature for reaction types

What is the correct name for a reaction like this? $$ \ce{ 4MnO2 ->[500\ ^\circ \text{C}] 2Mn2O3 + O2 ^}$$ Is it a synthesis, or a Decomposition? I tried to find it out with ...
2
votes
1answer
44 views

Is (S)-3-hydroxypalmitoyl-CoA a hydroxy fatty acyl-CoA?

Is there anything special about (S)-3-hydroxypalmitoyl-CoA comparing to those with different number of carbons, e.g. (S)-3-hydroxyoctanoyl-CoA, (S)-3-hydroxydecanoyl-CoA, (S)-3-hydroxylauroyl-CoA? I ...