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3
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0answers
44 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 ...
0
votes
1answer
32 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
135 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
91 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
50 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 ...
1
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0answers
31 views

Is The Synonym for Hypervalence Oxymoronic? [closed]

Is the term "expanded octet" an oxymoron? If something has expanded its octet, then it no longer has an octet. What do you think? To me this falls into the league of "dark light." If I draw an ...
0
votes
2answers
66 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
469 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 ...
0
votes
0answers
23 views

impure substance vs mixture [duplicate]

Based on what I have found on the web they are the same. But chemists seem to use a colloquial terminology, by which if the ratio of two substances in a mixture is below --say-- 1/1000 or above ...
4
votes
1answer
26 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
124 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
31 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
6k 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 ...
0
votes
1answer
45 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 30g of ethane will be a) -82 KJ b) ...
1
vote
0answers
146 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
51 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
54 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
85 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 ...
1
vote
1answer
453 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 ...
6
votes
2answers
5k 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 ...
2
votes
1answer
58 views

Is there a specific term for reactions of the form $\ce{A + B -> C + D}$?

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
23 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 ...
7
votes
2answers
146 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
665 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
134 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
53 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 ...
3
votes
2answers
79 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
42 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 ...
6
votes
1answer
113 views

What does it mean when “a gas is dilute in CO₂”?

I'm reading an article about carbon sequestration, and I came across a strange phrase: "The flue gas is dilute in $\small\ce{CO2}$". I can't quite ascertain its meaning from the context. I think it ...
1
vote
1answer
337 views

Is “ice point” the same as “freezing point”?

I am using an old book and they almost use both terms interchangeably sometimes. Do they mean the same thing? Similiarly for "steam point" and "boiling point"
4
votes
2answers
4k views

Difference between lab-grade and food-grade purity?

What is the difference in purity betwen lab-grade and food-grade when talking about potentially consumable compounds? As an example let's take ascorbic acid powder: if it's marked as lab-grade, does ...
3
votes
1answer
255 views

What is the correct name for this lab technique [crystallization]

Take a glass rod and rub vigorously the wall of the flask, the substance will crystallize out of the solution. Take a fire polished stirring rod and etch (scratch) the glass of your beaker. The small ...
4
votes
3answers
11k views

What is a neutral atom?

Someone gave me definition of atomic number as follows: The number of electron or proton present in a neutral atom is called atomic number. It is represented by ...
3
votes
2answers
245 views

Should one pronounce “periodic” the same in “periodic acid” and “periodic table”?

In “periodic table”, the adjective is related to the noun period, and comes from Ancient Greek περίοδος through French périodique. In “periodic acid”, it is formed from the prefix per- and iodic (like ...