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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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5
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1answer
207 views

Typesetting oxidation state and charge simultaneously

I'm currently trying to typeset the ion $\ce{Cr2O7^{2-}}$ with oxidation numbers on. My first thought was to put the oxidation state above the atom, but according to IUPAC, the oxidation state should ...
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0answers
2k views

Why does ozone reduce to oxygen?

The O's in ozone and in dioxygen all have oxidation states of 0. If this is the case, why is ozone considered to be reduced to form dioxygen (since there's no change in oxidation state)? Would the ...
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2answers
4k views

Propanoic acid reaction with potassium permanganate

I was conducting a lab where we have to identify/justify how functional groups affect the oxidation of a molecule. I used propene, propanone, and propanoic acid for this reaction. From what I have ...
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0answers
1k views

How do we know if a compound can be oxidized?

I'm studying organic chemistry, and I have to identify compounds that can be oxidized in some exercises I am doing. For instance, an $\ce{R-CHO}$ can be oxidized further, but an $\ce{R_{3}-COH}$ ...
3
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1answer
1k views

Oxidation state of ions in a unit cell

Given that $\ce{Al2O3}$ is face-centered cubic (cubic-closest packed) with respect to oxide anions, I am instructed to find the oxidation state of each aluminum ion "fragment" in the unit cell. Let'...
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0answers
1k views

Oxidation state of metals in complexes with bridging ligands [closed]

How do I find the oxidation number of $\ce{Co}$ in a coordination complex like the tetraaminecobalt(2) $\mu$-amido $\mu$-oxo tetraamine cobalt(2) ion? I searched all over the net but can't find it ...
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0answers
84 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
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1answer
3k views

Does a Na2SO3 solution oxidize to Na2SO4 in an oxygen rich atmosphere?

Let's assume I have a pure solution of water and $\ce{NaOH}$. When this solution comes in contact with an atmoshpere containing inert gases and $\ce{SO2}$, then $\ce{NaHSO3}$ and $\ce{Na2SO3}$ will be ...
3
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1answer
188 views

Is xenon electropositive in compounds of xenon?

Do you agree with the below passage in my text? Electronegativity is defined as the ability for something in a covalent framework to attract electrons also in covalent bonds. Electropositivity is ...
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1answer
481 views

Why does chlorine oxidise iron to iron(III), not iron(II)?

I was asked to predict the product of the reaction between iron metal and chlorine gas: $$\ce{Fe +Cl2->} ?$$ The product here is supposed to be $\ce{FeCl3}$. But how would we know if the product ...
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2answers
1k views

Why does oxidized copper become green?

Why does oxidized copper turn green? I am sorry if this question is too basic, but am really stumped here. It would be helpful if one could provide a research paper or website with your answer.
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2answers
948 views

Forming magnetite on cast iron pan

I am in the process of seasoning a cast iron pan. (Creating the black non-stick coating typical of such pans.) This is done by causing thin layers of flaxseed oil to polymerize and bond to the iron. ...
13
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2answers
716 views

Negative oxidation states of Si

According to List of oxidation states of the elements, silicon has a possible oxidation state of $-4$. Now, I've been looking everywhere for a compound that contains Si(-IV), but I cannot find any ...
2
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2answers
87k views

What is the balanced equation for the reaction of potassium permanganate, iron sulfate, and sulfuric acid? [duplicate]

I'm trying to balance the following redox equation. I think this is happening in acidic solution, the textbook doesn't specify anything more. Can you please help me understand if I got the half ...
2
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1answer
10k views

Why is sodium chloride edible whereas both sodium and chlorine are highly reactive?

Sodium chloride is edible. But elemental sodium and chlorine are highly reactive and poisonous. What is the difference? Also, is there any difference in eating sodium chloride in powder form and ...
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1answer
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How to balance more complex redox reactions?

I'm in an advanced level chemistry course, and so far we've been introduced to balancing redox reactions. The basic ones like $$\ce{MnO4- + Cl- -> Mn^2+ + Cl2}\tag1$$ are pretty easy for me, but ...
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1answer
1k views

Name the following coordination complex

What are the IUPAC rules when naming a coordination complex like: $$\ce{[Pt(NH3)4][Pt(NH3)Cl3]}$$ Now according to my textbook, it is named as tetraammineplatinum(II) amminetrichloridoplatinate(II)...
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2answers
734 views

Oxidation of Carbons

In which of the reactions below is the first compound in the equation NOT oxidized? The correct choice is (D), which can be seen through process of elimination, but I was wondering how to do this ...
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2answers
83 views

Checking if it is a redox reaction

Ethanoic acid dissociates according to the following equation: $$\ce{CH3COOH + H2 O -> CH3COO- + H3O+}$$ I want to know if it is a redox reaction or not. In the ethanoic acid I obtained that the ...
6
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1answer
3k views

How is the triferric tetroxide of iron possible?

If oxygen has a valency of $-2$, $4$ of it would result in $-8$. But iron doesn't have a (variable) valency of anything that goes to $-8$. Then how is $\ce{Fe3O4}$ possible?
19
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6answers
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Do atoms form either a positive or a negative charge, but not both?

I do not mean at the same time, of course, but I mean it appears from an overview of the common charges formed from ionizing various elements that each element forms one or more of either positive or ...
5
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1answer
5k views

How can nitrogen achieve +5 oxidation state?

Nitrogen has no available d-orbitals. Yet, it forms compounds where its oxidation state is +5, like in nitric acid. How?
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1answer
6k views

Oxidation numbers [duplicate]

An element have many oxidation numbers, then which one should we consider in the given question? e.g. In the compound $\ce{HCN}$ as $\ce{C}$ {carbon} has +4,+2,-4 oxidation numbers and $\ce{N}$ {...
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3answers
88k views

Why does carbon monoxide have a greater affinity for hemoglobin than oxygen?

Hemoglobin is an iron-containing oxygen transport metalloprotein in the red blood cells of most mammals. Simply put, it's a carrier protein. Interestingly it doesn't carry carbon dioxide in the same ...
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1answer
2k views

Oxidation of Carbon atom in Alkene, Alkyne and Alkanes of functional groups?

Nomenclature priorities are in order of the degree of oxidation of the carbon atom. I am not sure if it's advisable to just take it as it is and use it or try to understand the basis of the ...
2
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1answer
828 views

Formation of magnesium bismuthide

Magnesium shows an oxidation state of $+2$ and bismuth shows an oxidation state of $+3$. Both do not show a negative oxidation state. Then how is magnesium bismuthide ($\ce{Mg_{3}Bi_{2}}$) formed?
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1answer
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Why is Sulfur trioxide a neutral electrophile?

My chemistry book says, an electrophile is a reagent which is atrracted to electrons, therefore positive ions and reagents with incomplete octets act as electrophiles, Sulfur trioxide belongs to ...
3
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2answers
969 views

Is ClH7 possible? [duplicate]

Chlorine can be $sp^3d^3$ hybridized. If so, it can form $\ce{ClH_7}$ and then chlorine, being more electronegative, will have (-7) as its oxidation number. But we know that the oxidation number of $\...
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2answers
6k views

Why any other element except fluorine wouldn't take electrons from oxygen?

My teacher said that fluorine is more electronegative than oxygen thus it will take electrons of oxygen. But now, why won't other Group 17 elements, like chlorine, bromine, iodine, would take ...
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0answers
71 views

Possible ionization and fragmentation of chemicals

Is there any generic method where I can know/calculate/generate the possible ionization and fragmentation of a specific chemical, for example, hydrogen chloride and water? This question is actually ...
2
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2answers
5k views

Oxidation number of hydrogen in compounds

In a given compound that contains three elements (e.g. a metal, a non-metal, and hydrogen), how can it be determined whether hydrogen is connected to the metal or the non-metal so that its oxidation ...
6
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1answer
3k views

Why are multiple oxidation states useful for a catalyst?

Transition elements are good catalysts because they have multiple oxidation states?Why multiple oxidation states matter?
4
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1answer
141 views

How does radiation facilitate the formation of tetravalent iron?

In reading the article abstract What Oxidation State of Iron Determines the Amethyst Colour?, the author states that in regards to the gemstone amethyst, from clear quartz: The crystal was ...
12
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1answer
1k views

Why are inert gas (especially Xenon) compounds powerful oxidizing agents?

I am curious as to why compounds with inert gases, such as $\ce{XeF4}$, $\ce{XeF2}$, and $\ce{XeO3}$ are considered powerful oxidizing agents. I would attribute the phenomenon to the highly oxidized ...
5
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1answer
93 views

To what state would copper wiring revert if abandoned for centuries?

Would copper wires from power transmission or telephone lines acquire a patina but remain largely intact, or oxidize into dust after a century or more without replacement or maintenance? Obviously ...
2
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1answer
31k views

How to calculate valence factor (n-factor) for a element?

Suppose I am given some reaction in which $$\ce{C6H12O6 -> CO2}$$ and I want to calculate n-factor for this reaction to ultimately calculate equivalent weight of carbon for this reaction. Since $$...
4
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2answers
222 views

What's the relation between the octet rule and quantum exclusion and how is it related to oxidation state?

What in the quantum nature of electrons gives rise to the octet rule? How is it related to the fact that an element cannot have an oxidation state higher/lower than the complementary to 8?
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3answers
1k views

Determine if the following change is an oxidation, a reduction, or neither

The following reaction is not a complete reaction. Determine if the change is an oxidation, a reduction, or neither: $$\ce{CrO4^{-2} -> Cr2O7^{-2}}$$ I know that the answer to this problem ...
-1
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1answer
2k views

Iodate ion and Octet rule

'm trying to figure out why the oxidation state of the iodate ion is +5. The iodine atom has 7 electrons in its outermost shell (comprised of s and p sub-shells). Two oxygen atoms receive 2 electrons ...
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0answers
21 views

Fenton's reagent application to leachate

What is the experimental procedure for applying fenton's reagent to leachate? What doses of hydrogen peroxide and ferrous sulphate required? How much contact time needs to be provided?
17
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3answers
31k views

Oxidation state of the sulfur atoms in the thiosulfate Ion

What are the oxidation states of the two inequivalent sulfur atoms of the $\ce{S2O3^{2-}}$ molecule? For all I know is that Lewis Structure does matter in most of the cases.
3
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1answer
1k views

n-factor for ammonium nitrite?

The given reaction is $$\ce{NH4NO2 \rightarrow N2 + 2H2O}$$ The way I did it was $$\ce{NH4+ \rightarrow \frac{1}{2} N2 + 4H+ + 3e-}$$ and $$\ce{NO2- +3e- +4H+ \rightarrow \frac{1}{2} N2 + 2H2O}$$ ...
11
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1answer
3k views

Why is electronegativity increasing with oxidation state increase?

I may be a rudimentary fact or something really "not-that-hard-to-figure-out", but In inorganic chemistry it is common to consider a single value of the electronegativity to be valid for most "...
5
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2answers
27k views

Why is NH2 negatively charged?

Whenever I look up the Lewis structure for $\ce{NH2^-}$, it shows 8 electrons. Now I understand the octet rule, but I still don't see how an electron can just appear from nowhere. There are 5 valence ...
0
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1answer
108 views

Nomenclature of inorganic compounds

As depicted in books, $\ce{NO3-}$ and $\ce{NO2-}$ are called as nitrate and nitrite respectively. Where (-ate) suffix is used for higher oxidation state and (-ite) suffix is used for lower oxidation ...
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1answer
3k views

What is the oxidation state of nitrogen in nitrate ion and what is its structure? [duplicate]

What's the oxidation state of nitrogen in $\ce{NO3-}$ ion. Simple calculation depicts that it's $+5$. But second period elements never show variable oxidation states. And it's structure is so ...
3
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0answers
445 views

How does heat and/or boiling remove vitamin C?

The www is full of crackpot claims about how various food treatments alter their nutrition content and it makes finding actual science very difficult. I am specifically interested in the vitamin C ...
0
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1answer
84 views

How do I know with which oxidation numbers I can form a certain kind of compound?

Take, for istance, phosphorus; it has eight different oxidation numbers, but it can only form two different anhydrides, phosphoric (when the oxidation number is 5) and phosphorous (when it is 3). How ...
1
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1answer
11k views

How do I find the oxidation number of a coordination complex

I actually know how to calculate the oxidation number for coordination complexes but some complexes like the below are giving some reistance $\ce{[Cu(NH3)_2][Fe(H2O)_3]}$ (diamminecopper(?) ...
8
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4answers
781 views

How is it possible to obtain a value of 8/3 as an oxidation state?

Iron's oxidation state in $\ce{Fe3O4}$. I really can't get the logic behind this.