Redox is the portmanteau of reduction and oxidation and therefore refers to reactions in which electrons are transferred and in consequence the oxidation state of the involved elements changes.

learn more… | top users | synonyms

-3
votes
1answer
25 views

Which will get oxidized easily? [closed]

Which of the following will get oxidized easily? a.Alkanes b.Alkenes c.Alkynes
1
vote
1answer
38 views

How does the oxidation of NaI by sodium hypochlorite to give I+ work?

I'm in trouble with the oxidation of NaI by $\ce{NaClO}$, the reaction should give $\ce{I+}$ which then reacts by electrophilic substitution with an aromatic complex. As of now I've come to: $$\ce{ ...
3
votes
0answers
22 views

Does Iron (III) Sulfate react with copper?

As my understanding, there should be an oxidation-reduction reaction: $$ \ce{2Fe^{3+} + Cu \rightarrow 2Fe^{2+} + Cu^{2+}} $$ However, I always see the process using $\ce{FeCl_3}$ to etch ...
0
votes
1answer
29 views

Electrophilic aromatic substitution with fluorine

Why don't we usually use diatomic fluorine in electrophilic aromatic substitution? Is it because fluorine is a potent oxidizer and will react with the carbons? What might happen if we reacted ...
0
votes
1answer
14 views

Half reaction method justification

I have to say I have never really understood the half reaction method. What bothers me is that it seems to be too artificial. Too many little rules to remember! Why don't we use the mass conservation ...
1
vote
1answer
37 views

Old samples of magnesium oxide become contaminated with magnesium carbonate. Suggest how this contamination takes place

Old samples of magnesium oxide become contaminated with magnesium carbonate. Suggest how this contamination takes place. I don't understand what I'm meant to put for this.
0
votes
1answer
16 views

Reducing agent in preparation of CpRuCl(PPh3)2

Synthesis of cyclopentadienyl-bis-triphenylphosphine-ruthenium chloride $\ce{RuCl(PPh3)2(\eta^5-C5H5)})$: Dissolved $\ce{PPh3}$, $\ce{RuCl.3H2O}$ and cyclopentadiene in ethanol and heated under ...
2
votes
1answer
31 views

Disproportionation Reactions of the Halogens: Writing balanced net ionic equations for four reactions. See details

I first conducted the following reactions, each in separate test tubes: $\ce{NaBr}$ + $\ce{H2SO4}$ + $\ce{NaBrO3}$ $\ce{KI}$ + $\ce{H2SO4}$ + $\ce{KIO3}$ ...with water and dichloroethane added ...
0
votes
1answer
40 views

Why do Electrons leave the Zinc in a Galvanic Cell

What induces electrons to leave the atoms around the part of the zinc metal in a solution to travel up along that zinc metal and above the solution, through the wire and to the copper metal and ...
2
votes
1answer
22 views

Half Cell Method of Voltage Calculation in an Electrochemical Cell

A cell consists of a copper electrode $\ce{Cu}$, in contact with $1.800\cdot10^{-2}~\mathrm{M}$ cupric ion and a platinum electrode, $\ce{Pt}$, in contact with $1.400\cdot10^{-1}~\mathrm{M}$ ...
1
vote
1answer
36 views

Is a metal hydroxide fully or partly oxidised in insufficient base?

Firstly, my question only applies to transition metal compounds with more than one hydroxide group, otherwise it would be more obvious. The reason I'm asking is in an effort to oxidise some nickel ...
2
votes
0answers
31 views

How to efficiently reduce of ilmenite to pure titanium?

I am looking for a process in which reduces ilmenite to pure titanium with the highest yield possible. We are to use a process of our choice or one that we have created in conjunction with FactSage to ...
0
votes
1answer
38 views

What is the balanced ionic redox reaction of nitrite ions with manganate(VII) ions in acidic solution?

What is the balanced ionic redox reaction of nitrite ions with manganate(VII) ions in an acidic solution? My suggestion is: $\ce{5NO2- + 2MnO4- + 6H+ -> 5NO3- + 2Mn^{+2} + 3H2O}$ ...
0
votes
1answer
42 views

How to find the balanced reaction equation for the decomposition of potassium dichromate in non aqueous conditions?

I can't find a method to balance a reaction: the heating of potassium dichromate, which forms potassium dichromate (III), dichromate oxide (III) and oxygen. I can't add water products as $\ce{H+}$, ...
1
vote
1answer
97 views

Potassium permanganate (VII) + Glucose + Sodium hydroxide =?

I saw this experiment many times but still can'y explain why. The experiment is first prepare two solution. The first one is to dissolve potassium permanganate crystal into distilled water to form ...
0
votes
1answer
49 views

What happens when oxidizing Ni(OH)2 with a strong base?

In an aqueous solution, Nickel oxyhydroxide is oxidised with a 1:1 ratio of aqueous Sodium hydroxide. My goal is to produce Nickel oxyhydroxide ($\ce{NiOOH}$). Strong Base: $\ce{NaOH + H2O ...
1
vote
1answer
69 views

Redox Question: Concentration of Pb2+ is unknown

What is the concentration of $\ce{Pb^{2+}}$ in a lake that has a pH of 6.0 and is in equilibrium with $\ce{PbO2(s)}$ and atmospheric oxygen? $\ce{PbO2(s) +4H+ +2e- -> Pb2+ +2H2O}$ log K = 49.2 ...
0
votes
1answer
50 views

How can I balance the redox reaction of sulfur dioxide with oxygen?

How do I balance this reaction using half-redox equations? $$\ce{2SO2 + O2->2SO3}$$ My work is: Oxidation: $\ce{SO2 + H2O -> SO3 + 2e- + 2H+}$ Reduction: $\ce{H2O + 2e- + O2 -> SO3 + ...
3
votes
2answers
77 views

Does it matter if all rust is removed before it is painted over?

In the context of automobile repair work, assume a metal surface has rust over it. Does it matter if all of the rust is removed before the metal surface is painted? If it does matter, then why? It ...
1
vote
1answer
50 views

Reactions that occur at the anode electrode of electrolysis dilute H2SO4

How to know that reaction that occur at the anode electrode is $\ce{2H2O -> 4H+ + O2}$? Why the reaction is not the oxidation of $\ce{SO4^{2-}}$? This problem does not give the E0 of ...
2
votes
2answers
67 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 ...
1
vote
1answer
43 views

which substance has the higher oxidation strength?

I have to decide which one has a higher oxidation strength $\ce{ClO-}$ or $\ce{Cl2}$ $\ce{ClO- + H2O + 2e- -> Cl- + 2OH-}$ $\ce{Cl2 + 2e- -> 2Cl-}$ Will this reaction occur? $\ce{ClO- + H2O ...
1
vote
1answer
59 views

How does a redox reaction between NaClO and KBr take place? will bromide be oxidised to bromine?

How does a redox reaction between $\ce{NaClO}$ and $\ce{KBr}$ take place? will bromide be oxidised to bromine? $\ce{2Br^{−} + ClO^{−} + H2O ⟶ Cl^{−} + 2 OH^{−} + Br2}$ or will bromide be oxidised ...
4
votes
1answer
37 views

How does a redox reaction between ClO- and Br- take place?

How does a redox reaction between $\ce{NaClO}$ and $\ce{KBr}$ take place? will bromide be oxidised to bromine? $\ce{2 Br- + CIO- + H2O -> Cl- + 2 OH- + Br2}$ or will bromide be oxidised to ...
8
votes
1answer
873 views

Does bleach turn a substance white or colorless?

From what I understand, bleach works to weaken the ability of a substance to absorb light. Thus this seems to be "whitening" i.e. reflecting all light. In contrast, colorlessness (according to ...
0
votes
1answer
42 views

Why would electrode reaction in galvanic cell stop when there's no neutrality in each cell?

I know that the salt bridge produces ions to balance out the positive and negative ions in each solution, but why won't it work without a salt bride? Would it even work at the start since there's few ...
2
votes
1answer
31 views

Terminology of redox reactions: which species are the oxidizing and reducing agents?

I've got a question regarding 'notation' for redox reactions. Suppose you are asked to identify the oxidizing and reducing agents for a simple reaction like this one: $$\ce{Cl2(aq)}+\ce{2KI(aq)} ...
5
votes
3answers
579 views

Is there non-redox reaction?

Redox reaction is a type of chemical reactions, and the result of electron transfer. But all chemical reactions are somehow involved electron transfer! Are there chemical reactions without electron ...
-1
votes
1answer
51 views

Use The Half Reaction Method to Balance the Following Equation in Acidic Solution [closed]

$\ce{Fe^2+ + MnO4- -> Fe^3+ + Mn^2+}$ What steps should I take?
6
votes
2answers
84 views

Nernst equation and electrolysis

Let's say we have a stable solution of $\mathrm{A}_{\left(\mathrm{aq}\right)}^{2+}$ and $\mathrm{C}_{\left(\mathrm{aq}\right)}^{+}$ , with their respective counter-ions. The associated redox ...
4
votes
1answer
84 views

How does copper reduce dilute nitric acid to nitric oxide and concentrated nitric acid to nitrogen dioxide?

Here are the 2 equations: $\ce{3Cu + 2NO3- + 8H+ <=> 3Cu^2+ + 2NO + 4H2O}$ ${E = 0.62V}$ $\ce{3Cu + 2NO3- + 4H+ <=> 3Cu^2+ + 2NO2 + 2H2O}$ ${E = 0.45V}$ The Nernst equation tells us ...
3
votes
2answers
50 views

What exactly is net ionic equation?

I once saw a problem, iron ions(II) titrated with potassium dichromate to produce Fe(II) and Cr(III). If I am to write the net ionic equation of this reaction, I got to make potassium dichromate on ...
1
vote
2answers
42 views

In this simple redox reaction, why does the Hydrogen oxidize the calcium metal?

I am understanding that the Hydrogen ions oxidize the calcium metal, neutralizing itself and creating a calcium cation. My question is why does the Hydrogen oxidize the calcium? Doesn't it prefer to ...
3
votes
1answer
90 views

Redox reactions - alkene to alcohol

How is the "correct" answer not a redox reaction? Isn't the "correct" choice a textbook example of an organic redox reaction? After all, we are breaking a C-C bond and replacing that with a C-O ...
4
votes
1answer
50 views

Standard electrode potential for electrolytic vs galvanic cells

Whys is the standard electrode potential (-) for electrolytic cells but positive for (+) galvanic cells. If E°cell > 0, then the process is spontaneous (galvanic cell) If E°cell < 0, then ...
6
votes
1answer
116 views

How does salt and water promote corrosion?

I was always wondering why iron only rusts when it gets wet. I know that for example aluminium oxidises on its own on regular basis. I also heard many complains that salt used to remove snow from ...
2
votes
2answers
100 views

Balancing the redox reaction

Question: Balance the following redox reaction: $$\ce{FeS2 + O2 -> Fe2O3 + SO2}$$ My Efforts: I tried balancing with oxidation number method. First of all i determined the oxidation ...
2
votes
2answers
322 views

Why does a chemical have more than one oxidation number?

Like for group I metals, it is understood that all the elements in the group would have an oxidation number of +1. As far as I know, oxidation number is how much electron the element loses/gains. ...
1
vote
2answers
108 views

Why does potential chemical energy decrease with increasing oxidation of carbon?

I saw an interesting spectrum in my biology class the other day. On the left end was methane - the least oxidized form of carbon - and the most energetic form of carbon (at least relative to what else ...
3
votes
1answer
81 views

Electron Transfer in Organic Reactions: Why Does Brown Iron Oxide Improve Burn Rate of Rocket Candy?

On wikipedia, this statement exists about rocket propellant aditives: Metal oxides have been found to increase the burn rate of sugar propellants. [...] Most often used are iron oxides. Red iron ...
0
votes
1answer
52 views

Sodium metal reduction of chloroform

In discussing how best to deuterate chloroform, it occurred to me that we could use sodium metal to reduce hydrogen into hydrogen gas. If this could actually happen, this would be a great thing - we ...
1
vote
1answer
40 views

What are the other definitions of redox reactions besides the gain or donation of oxygen?

As my teacher told us, oxidation is the gaining of oxygen and reduction is the donation of oxygen. In my reference book there are other definitions of this reaction. So please give me some alternate ...
1
vote
1answer
48 views

Potassium Atom can act as reducing agent, yet ion cannot?

I am currently looking through a revision sheet, however it has caught me on a question 'Explain why a potassium atom can act as a reducing agent yet a potassium ion cannot'. I have done brief ...
0
votes
1answer
22 views

pH Changes in primary cells

Primary Cells - pH changes during discharge Alkaline Cell: Manganese Dioxide Zinc Alkaline Cell Anode (-) $\ce {Zn(s) + 2OH^{−}(aq) → ZnO(s) + H2O(l) + ...
0
votes
0answers
38 views

Fuel Cell Chart - Anode, Cathode, Electrolyte

Can someone please check my table to make sure I have the correct information. I am especially unsure of the parts highlighted in yellow:
1
vote
1answer
90 views

Why are imines more susceptible to reduction than carbonyl compounds?

Why are imines more susceptible to reduction than carbonyl compounds? Imines react with $\ce{NaCNBH3}$ while the carbonyls don't.
4
votes
1answer
47 views

Determining redox half-reactions of single displacement reactions

For the following double displacement half reaction, the half reactions can be determined easily using the oxidation numbers. $$\ce{MnO_{4(aq)}^{-} + IO_{3(aq)}^- -> MnO_{2(s)} + IO_{4(aq)}^-}$$ We ...
0
votes
0answers
16 views

How to get sodium from sodium aluminate?

The sodium aluminate is formed when aluminium or aluminium hydroxide reacts with water solution of lye. After drying the water you'll end up with white crystals - sodium aluminate. I was wondering if ...
3
votes
2answers
116 views

Why are metal oxides generally more stable than their corresponding elemental forms?

Why is the oxidation of certain metals such as iron favorable from a thermodynamic standpoint? What is it about these metal oxides that makes them inherently more thermodynamically stable than their ...
6
votes
2answers
1k views

Nitrobenzene reduction with (tin) Sn catalyst: Why is C-H bond cleavage preferred over O-H bond cleavage?

I am trying to understand this mechanism for nitrobenzene reduction with $\ce{Sn/HCl}$. I do not understand why it implies that you pull off the $\ce{C-H}$ hydrogen instead of the $\ce{O-H}$ hydrogen ...