Questions tagged [oxidation-state]
Oxidation state is a concept, which assigns hypothetical charges to atoms in compounds. This tag should be applied to questions which relate to that concept or to oxidation states in atoms of compounds.
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In the complete combustion of methane, is it methane or carbon that is oxidised?
I realise this is a rather pedantic question, but I'm wondering which application of terminology is more correct here.
I know that, in the complete combustion of methane, methane is the reducing agent....
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3answers
149 views
Do molecules containing enough oxygen to burn themselves exist?
Is there a molecule with enough oxygen in it (for example, something like $\ce{HCOOOH}$) such that it can undergo complete combustion without requiring any additional oxygen? For example the above ...
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2answers
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Will strong base corrode aluminium in absence of oxygen? [closed]
From what i understand, putting iron in a vacuum chamber (airtight container) will stops further oxidation take place.
However in aluminium, with only oxygen, aluminium will form thin oxide film that ...
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2answers
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Why are group 13 compounds in the +1 oxidation state more ionic than those in the +3 oxidation state?
I know that for group 13 metals in the p block, the stability of +1 OS is generally more than the stability of +3 OS as it is energetically not favourable to attain the higher OS of +3 and such ions ...
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2answers
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Oxidation of sulfuric acid to Marshall's acid and its half cell reaction
$\ce{H2O2}$ can be prepared by successive reactions:
$\ce{2NH4HSO4 -> H2 + (NH4)2S2O8}$
$\ce{(NH4)2S2O8 + 2H2O -> 2NH4HSO4 + H2O2}$
The first reaction is an electrolytic reaction and second is ...
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1answer
39 views
How can one change the color of Iron Oxide by changing the composition or hydration?
How does the color of rust change depending on its makeup and state, or more to the point, how would one put the rust into that state?
For example, Wikipedia shows Iron(III) Oxide as being red in the ...
2
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1answer
298 views
What are the safest non-toxic elements I can own? [closed]
As in a recent question, I mentioned I collect elements. My collection already has quite a few elements and a rare alloy
(I have silicon, molybdenum, tungsten, gold, platinum, silver, copper, ...
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4answers
2k views
Can osmium react with oxygen at room temperature?
I’m an avid collector of elements (I love shiny rocks - don’t judge).
I’m looking to buy some osmium, as it’s one of the heaviest and hardest metals out there.
However, people online told me to avoid ...
5
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1answer
249 views
Oxidation number of methylene blue
I came across methylene blue's structure when it reacts with oxygen.
The left is the reduced state, and the right is the oxidized state.
However, when I looked at them carefully, the oxidation number ...
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2answers
93 views
The oxidation number of N and Cl in NOClO4
My doubt is not about the solution itself, actually I was able to find the solution myself.
We could split NOClO4 as (NO+) + (ClO4-) and then proceed, but here I "knew" this split. Is there ...
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2answers
98 views
Is Co(2+) easily oxidised to Co(3+)? [closed]
I think this question lacks some required informations but that's exactly what was given on my question paper. I thought of explaining this in descriptions of crystal field theory but I couldn't solve ...
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1answer
53 views
What exactly is oxidation number with regards to [Fe(CN)6]-4 [closed]
I read that $\ce{Fe}$ has an oxidation state of $+2$ in $\ce{[Fe(CN)6]^{4-}}$. Does that mean $\ce{Fe}$ gives away $2$ electrons? Doesn't $\ce{(CN)6}$ form coordination bonds with $\ce{Fe}$ meaning $\...
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1answer
105 views
What are compounds where oxygen has oxidation state -1/3 called?
I have heard of oxides, peroxides and superoxides where oxygen oxidation number is $-2, -1, -\frac{1}{2}$ respectively.
But I came across a molecule with the formula $\ce{KO_3}$, oxygen has $-\frac{1}{...
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1answer
81 views
How do I balance a hydrogen peroxide redox equation? [closed]
I have this equation:
$$\ce{H2O2 + MnO4- + H+ -> O2 + Mn^2+ + H2O}.$$
How do I balance it, since O has two different oxidation states on one side?
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1answer
178 views
Why does mercury(II) nitrate form only when using concentrated nitric acid?
In the reaction between mercury and nitric acid, mercury(II) nitrate only forms when concentrated nitric acid is heated up and added to it, if the acid is dilute, mercury(I) nitrate forms.
I ...
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2answers
158 views
Does boron exhibit +1 oxidation state?
My teacher told that boron exhibits only a $+3$ oxidation state, but he also wrote the unbalanced reaction
$$\ce{B + C -> B4C}.$$
Carbon has greater electronegativity than boron leaving us with $\...
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2answers
83 views
Apparent inversion of oxidation state of sulfate ion using minimal basis set
It is well known that the sulfate ion has essentially no 3d-2p bonding; hence I used the minimal basis set(STO-3G) for the NBO calculation I did via Gaussian, just to check it.
However, I got a ...
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1answer
93 views
Balancing disproportionation reaction of hypoiodous acid
In aqueous solution, the acid $\ce{HIO}$ disproportionates according to the following equation where m, n, p and q are simple whole numbers in their lowest ratios.
$$\ce{mHIO → nI2 + pHIO3 + qH2O}$$
...
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1answer
45 views
How To Know Which Oxidation Number To Use For Nitrogen [duplicate]
When given a compound like (NH4)2MoO4 and asked to find the oxidation number of Mo, how do I know which oxidation number to sub in for Nitrogen? On the periodic table, Nitrogen has oxidation numbers ...
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0answers
60 views
Why does CO2 have a greater affinity for hemoglobin than oxygen?
I know about CO but I am wondering if CO2 has similar mechanism? do you guys have any scientific reference
These species help form interactions between amino-acid residues at the interfaces of the ...
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2answers
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what happens if iron clamp is attached to a copper pipe to a wall? [closed]
I'm guessing its not a good idea, since iron will then corrode easily (also depending on the location and environment), Although copper do not rust it will increase the rate of it from oxidizing. plus ...
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1answer
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What is/was "uraneous oxide"? Was it an accepted name for a compound or mixed oxides of uranium?
In This National Technical Reports Library page for a 1965 report Method for Coating Actinide Particles in the list of keywords both Uranium compounds and Uraneous oxide are listed.
But I don't find ...
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2answers
394 views
Can ozone oxidise iodine to periodic acid?
I noticed that the reaction of ozone with $\ce{I_2}$ gives iodic acid and not periodic acid. Upon searching, I found this question:
Why does iodine get oxidized to iodic acid and not periodic acid by ...
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0answers
47 views
Why does one drain strainer rust while the other does not?
About a month back, I acquired drain strainers for my shower and kitchen sink. The package I got included one of each, which I installed immediately.
Within two weeks, the shower strainer was showing ...
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1answer
341 views
How can I prove ascorbic acid degradation with Uv-vis spectroscopy?
I have to prove scientifically why a sodium ascorbate solution in water turns yellowish - reddish over time. I know ascorbic acid is supposed to oxidize into dehydroascorbic acid, and the latter then ...
4
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2answers
123 views
Does lead carry the negative charge in plumbane?
It says in Wikipedia that lead tetrahydride or hydrogen plumbide or plumbane ($\ce{PbH4}$) is supposed to have lead in its -4 state and the hydrogen is in its +1 state because supposedly lead has a ...
2
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1answer
88 views
Oxidizing properties of sulfuric acid: can it oxidize hydrochloric acid to chlorine?
Can $\ce{H2SO4}$ oxidize $\ce{HCl}$ to $\ce{Cl2}$? I know that $\ce{KMnO4}$ can do it, but my question is considering $\ce{H2SO4}$. In sulfuric acid, sulphur is in +6 oxidation state and in $\ce{KMnO4}...
9
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1answer
634 views
Can fluorine ever have a positive oxidation state?
I know fluorine is the most electronegative element but can we humans ever synthesize fluorine in a positive oxidation state like +1?
2
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0answers
122 views
Is Chromium (VI) fluoride be synthesized properly?
Chromium (VI) fluoride, also known as chromium hexafluoride is a possible chemical compound with a chromium atom attached to 6 fluorine atoms. It has been unsuccessfully synthesized a number of times ...
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0answers
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Should uranium hexoxide exist?
This compound of uranium called uranium hexoxide or uranium (XII) oxide is a theoretical chemical compound. The uranium should have an oxidation state of +12 ,the highest of any known chemical. The ...
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1answer
195 views
Oxidation number of oxygen atoms in oxygen difluoride
My textbook says:
Oxygen is assigned an oxidation number of $+1$ in oxygen difluoride. The number assigned to each Oxygen atom will depend upon the bonding state of oxygen but this number would now ...
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3answers
180 views
Does a change in oxidation number in a redox reaction mean that an actual electron transfer occured?
Oxidation numbers are fictitious charges that pretend the entire molecule is an ion i.e. it artificially localizes electrons onto atoms within a single molecule. In a redox reaction, we find that an ...
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1answer
53 views
variable oxidation states [closed]
which of the statements is true:
looking at the electronic configuration of an element, can the possible oxidation states/oxidation number of an elemnet be predicted.
for example, the valence ...
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2answers
91 views
Is this analogy right? [closed]
Is my logic correct in this case ?
Since the formal charge represents the charge the element possess in a covalent compounds, is it right to say that formal charge is the equivalent term for covalent ...
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1answer
35 views
Forcing a steel pipe to rust completely
I understand rust. Fe + H20 → OH- → Fe(OH)2 or 3 and/or FenOm
I understand rust prevention and steels that are resistant to rusting. Trying to google this question gives thousands of answers on ...
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1answer
125 views
Cinnabar decomposition by heating optional method?
Is it possible to decompose cinnabar into $\ce{Hg}$ and $\ce{S}$ instead of $\ce{Hg + SO2}$ with roasting and heating. What conditions need to be satisfied in the new method?
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2answers
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What is the n factor of h2o2 undergoing disproportionation reaction liberating oxygen [closed]
There is a lot of confusion about the n-factor of hydrogen peroxide in its disproportionation into water and oxygen.
$$\ce{2H2O2 -> 2H2O + O2}$$
Some sources(1,2) say n-factor of $\ce{H2O2}$ is 2
...
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1answer
38 views
Determination of metal state from protein X-ray structure
Many proteins or enzymes contain metal ions within their active sites.
These metals are often directly involved in the reaction catalysed bu the enzyme. In certain cases the function is well known and ...
2
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1answer
2k views
Oxidation State of Nitrogen in N2O
If we try to calculate the oxidation state of nitrogen in $\ce{N2O}$ using the familiar algebraic method, we get oxidation state $+1$ for both nitrogen atoms and that's what I found when I looked it ...
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1answer
46 views
Ascorbic acid and aldehydes: Reaction and Influencing Metals
I've researched online and I've read that ascorbic acid can both promote oxidation and reduction depending on the conditions (I've read about trace metals but I've never found which metals affect its ...
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1answer
135 views
Why is +3 the oxidation state of Indium? [duplicate]
The three more energy electron layers for Indium(49) are, sorted from lower to higher energy:
[Kr] $5\text{s}^24\text{d}^{10}5\text{p}^1$
From this configuration, it could be said that is easy to ...
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0answers
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What is the composition, function, and classification of “6-Thio-2-Deoxyguanosine” and “13-mer thio-phosphoramidate”? How do I learn more about them?
I am assigned the task of explaining a biomedical research paper, it is about telomere and telomerase , and it talks a lot about the molecule Thio-2-Deoxyguanosine , 13-mer thio-phosphoramidate and &...
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1answer
34 views
Oxidation number approximately
I argued with my lecturer when he is saying that during the calculation of oxidation number, and your answer give you like 3.46 you can approximate it to whole number, I know tell him NO that if the ...
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Chemical reaction of bronze tarnishing
Can anyone explain to me the chemical process of bronze tarnishing? According to Wikipedia:
Bronzes are typically ductile alloys, considerably less brittle than
cast iron. Typically bronze oxidizes ...
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1answer
63 views
How do I go about solving this question? [closed]
So I've studied Redox concepts but in the exam we are asked questions like these.
How am I supposed to know what the reaction is going to be?
How do I go ahead and assume what oxidation state it's ...
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1answer
216 views
Why can't iodide be oxidised to iodate in acidic medium?
Even if we use a strong oxidising agent like 'permanganate ion in acidic medium' it doesn't help oxidise iodide to iodate, but a relatively weaker oxidising agent 'permanganate ion in alkaline medium' ...
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0answers
49 views
Write half-cell reaction for a battery
A primary battery has the reaction:
$$\ce{2MnO2 + Zn + 2NH4Cl -> Mn2O3 + Zn(NH3)2Cl2 + H2O}$$
Write the half-cell reactions for the given equation.
I am having trouble understanding how you know ...
2
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1answer
212 views
Ambiguity in definition of primary valency in Werner's theory
In Concise Inorganic Chemistry (5th Edition) on page 196 , the primary valency of $\ce{[Co(NH3)5Cl]Cl2}$ is given to be 2.
In other textbooks and in the question here, we get the idea that:
The ...
0
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1answer
75 views
Counting electrons in Ozonolysis [closed]
I can't understand the electron count made on this page about Ozonolysis. (http://ursula.chem.yale.edu/~chem220/chem220js/STUDYAIDS/ozonolysis/Oz.html)
This is the specific part of the article:
From ...
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3answers
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What does *oxidizing* have to do with *hydrogen*? [closed]
An oxidizing acid is a Brønsted acid that is a strong oxidizing
agent. All Brønsted acids can act as oxidizing agents, because the
acidic proton can be reduced to hydrogen gas.
(source: Wikipedia)
...
