Questions tagged [inorganic-chemistry]
Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.
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Could you help me solve this problem? [closed]
In the following cell Pt,H2 p=?|HClO4(aq) 1.5 x 10-4 M || Cr3+(aq) 1 M, Cr2+(aq) 0.05 M |Pt, knowing that E0 Cr3+/Cr2+ = -0.401 V, calculate the partial pressure of hydrogen for which the ...
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Question regarding chemical equilibrium when adding a salt to acid solution
Having read the following was wondering something:
$$\mathrm {p}K_\mathrm{a} = -\log\frac{[\ce{H+}]_\mathrm{eq}[\ce{A-}]_\mathrm{eq}}{[\ce{HA}]_\mathrm{eq}} $$
$$\ce{HA <=> H+ + A-}$$
$$\mathrm{...
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Chemical Difference between Dexedrine and Methamphetamine
I am a newbie at chemistry and was wondering what the key difference between Dexedrine and Methamphetamine HCL is?
I know that Methamphetamine has an extra methyl group compared to Adderall. But what ...
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Why is ruthenium dioxide a conductor while titanium dioxide is an insulator?
Ruthenium dioxide has the same crystal structure as rutile (titanium dioxide), and the metal atoms are in the same oxidation state. Yet ruthenium dioxide is a metal-like conductor (its resistivity is ...
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Why does the temperature of the reactants affect products formed?
It is often seen that in chemical reactions, the temperature of the reactants often affect the products formed. For example in reactions of sodium hydroxide with chlorine, the products formed depend ...
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1answer
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In what form does the respective halides of thallium exist as?
Thallium Halides like $\ce{TlF}$ and $\ce{TlI}$ exist. However, my text says that $\ce{TlI}$ exists as $\ce{Tl+}$ and $\ce{I3-}$. This is understandable with the help of the inert pair effect. Then ...
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Grade-recovery curve
How would I get the grade for each recovery point in order to plot a grade recovery curve?
The only information I have is that the feed grade is 10% valueite (the wanted mineral) and that the ore ...
4
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1answer
26 views
What is the trend in hydration entropy of alkali metal ions?
Is there a trend in alkali metal ion hydration entropy?
There's much talk of hydration enthalpy, but I have a hard time finding information about the change in entropy.
Am I right in thinking that Li$^...
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2answers
120 views
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
35 views
Why is Cu(II) more stable than Cu(I)? [duplicate]
Seeing Copper has an exceptional electron filling in its valence shell(4s1 3d10), the way I see it is that on +1, a d10 configuration should be more stable and hence easier to attain than a d9 which ...
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1answer
35 views
Decline in current during electrolysis
I observed a sharp decrease in the current when I carried out the electrolysis of water. Just to set the context, I used a voltage of $\pu{12V}$ and the concentration of my electrolytes were $\pu{0.15 ...
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1answer
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Is acac- a weak field ligand?
From the chemical structure of acac- compared to NH3 and en, is acac- a stronger or weaker ligand strength? How and why do we know this?
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Why K2CrO4 Potassium chromate is a good oxidizing agent but K2MoO4 Potassium molybdate is not? [duplicate]
although they are in the same group?
Why $\ce{K2CrO4}$ Potassium chromate is a good oxidizing agent but $\ce{K2MoO4}$ Potassium molybdate is not?
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What is the structure of potassium tetraperoxochromate(V)? [closed]
Though some structures are available on the net, different sources are showing different structure, so please share the actual structure of $\ce{K3CrO8}.$
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1answer
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Comparing OāO bond length in hydrogen peroxide and dioxide(2ā) ion
Problem
How can we qualitatively compare the bond lengths between $\ce{H2O2}$ and $\ce{O2^2-}?$
Answer
Attempt
I tried using molecular orbital theory, but since both have peroxide $\ce{O2^2-},$ the ...
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1answer
32 views
Why is the solution of ammonium bifluoride more acidic than aqueous ammonium fluoride?
At low concentrations of aqueous $\ce{NH4HF2}$ $(w = 1ā2\,\%)$ $\mathrm{pH}\approx 3.$
But aqueous $\ce{NH4F}$ $(w = 20ā40\,\%)$ has $\mathrm{pH}\approx 7.$
Yet the equilibria of
$$
\begin{align}
\ce{...
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Does aqueous ammonium fluoride solution release hydrogen fluoride vapors?
Can $\ce{HF}$ vapors be released from $\ce{NH4F}$ solution in water $(w(\ce{NH4F}) = 40\,\%)$ at room temperature?
I assume that dissolving $\ce{NH4F}$ in water produces small amount of $\ce{HF}.$
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1answer
37 views
How does precipitate affect cell potential?
A cell is set up with copper and lead electrodes in contact with $\ce{CuSO4(aq)}$ and $\ce{Pb(NO3)2(aq)},$ respectively, at $\pu{25 Ā°C}.$ The standard reduction potentials are:
$$
\begin{align}
\ce{Pb^...
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How does the value of standard electrode potential affect a metal-ligand complex to be formed? [closed]
Could someone please explain on how the value of standard electrode potential affects the ability of metal ions to form a ligand complex with water?
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1answer
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What chemical could be used as carbon monoxide scrubber?
I am trying to produce nitrogen by passing air over a heated tube of coals. This leaves a mixture of $\ce{CO},$ $\ce{H2O}$ and $\ce{N2}.$ Only $\ce{CO}$ is unwanted in this case.
Could I use calcium ...
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What happens when solution containing two or more cations are electrolysed at an excess potential?
$\pu{250 mL}$ of a waste solution obtained from the workshop of a goldsmith contains $\pu{0.1 M}$ $\ce{AgNO3}$ and $\pu{0.1 M}$ $\ce{AuCl}$. The solution was electrolyzed at $\pu{2 V}$ by passing a ...
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34 views
Is it possible to solve for the equilibrium value given only the initial amounts of reactants? [closed]
At $\pu{90 Ā°C}$ following equilibrium is established:
$$\ce{H2(g) + S(s) <=> H2S(g)}$$
If $\pu{0.20 mol}$ of hydrogen and $\pu{0.1 mol}$ of sulfur are heated to $\pu{90 Ā°C}$ in a $\pu{1.0 L}$ ...
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Interatomic distance of alloys [closed]
In pure crystals the interatomic distance is well defined. For example:
In a carbon crystal lattice, it is the distance between 2 carbons.
However if we have an alloy (e.g., Silicon-Germanium), how ...
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Write an equation to show how anhydrous aluminium chloride is prepared [closed]
The balanced equation of this reaction
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How many oxygen atom(s) is/are present in a molecule of Linde-A? [closed]
Please find the attached.
The formula of the zeolite Linde-A is written as Na12(AlO2)12(SiO2)x.27H2O. How many oxygen atom(s) is/are present in a molecule of Linde-A?
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1answer
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HCN, or my nose says I'm dead [closed]
As you see, I still post...
I studied chemisty decades ago (and when I was through with all the compulsory practica, I was sent to a computer chemistry workgroup and politely suggested to never touch ...
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Interatomic spacing vs electric conductivity
I have a theory which may be wrong but I will write it down.If 2 elements at the same group (in solids)have the same crystal structure then the one with the biggest interatomic spacing has better ...
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Number of Fe3 in grams? [closed]
I have 3058 grams of Iron. How many grams of Fe3 do I have?
I see Molar Mass of Fe3 = 55.845g/mol
So if 55.845g = 3 Irons then Fe = 55.845g /3 = 18.615grams per Fe?
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1answer
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Calculate EAN for [Fe(diars)2Cl2]Cl? [closed]
I know EFFECTIVE ATOMIC NUMBER (EAN) as the following
ā¢ The sum of the number of electrons, donated by all ligands and those present on the central metal ion or atom in the complex is called an ...
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why can't Mn(V) exist as a stable complex [Mn(H2O)6]5+? [duplicate]
Transition metals are well known for having more than one stable oxidation state. Manganese has more than any other.
In its compounds manganese exhibits oxidation states from +2 to +7.
The common ...
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27 views
Change in Fermi level in a doped semiconductor
Suppose we have a crystal lattice of doped Si with dopant Boron atoms. The energy level of the holes of the Boron atoms are just some eV above the valence band of Si.
My question: If we replace all ...
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Energy of valence electrons [closed]
I am currently studying Electrical Engineering and I have this question:
An energy band is formed by the overlapping of atomic orbitals of atoms coming close to each other. I suspect that if the ...
4
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1answer
100 views
Why is oxygen more stable than oxygen dication?
According to molecular orbital theory (MOT), $\ce{O2^2+}$ has a greater bond order than $\ce{O2}$ and two less antibonding electrons. So why is molecular oxygen $\ce{O2}$ more stable than the ...
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enthalpy of formation group 2 oxides
i understand the the trend for enthalpy of formation of alkaline earth metal oxides should become less exothermic moving down the group as the positive charge density decreases and the strength of the ...
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2answers
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Writing a chemical equation with a reactant of unspecified chain length [closed]
Would appreciate it if I got some general tips and hints and not the solution cause I'm trying to learn from this question :)
The question is as follows:
FA1 is a solution containing $\pu{5.00 g dm-3}...
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0answers
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Why is percentage of silica (silicon dioxide) in river sand, higher than in Beach Sand [closed]
I have done a experiment on determining the percentage of silica(silicon dioxide) in various sand samples.
I have found that percentage of silica in river sand is of higher percentage than beach sand.
...
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2answers
54 views
How tetraamminecopper(II) is formed? [duplicate]
I'm trying to get a sense of how $\ce{Cu^2+}$ and $\ce{NH3}$ are bonded together because it doesn't make any!
I understand that $\ce{NH3}$ has a lone pair of electrons that can be donated (right?), ...
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Magnetic properties of K2MnO4 and KMnO4
According to me
$\ce{MnO4^2-}$ā Paramagnetic
$\ce{MnO4^-}$ā Diamagnetic
On the basis of this
$\ce{K2MnO4}$ā Paramagnetic
$\ce{KMnO4}$ā Diamagnetic
BUT
According to my class teacher
$\ce{KMnO4}$...
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Does BiCl exist?
As we know group 15 elements can show +1,+3,+5(in some cases).why doesn't BiCl form. I found plenty of discussion on BiCl3,BiCl5 and other Bi compound , I tried searching about BiCl and got nothing on ...
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2answers
103 views
Total entropy change for a spontaneous reaction
For the oxidation of iron,
$$\ce{4 Fe(s) + 3 H2O(g) -> 2 Fe2O3(s) + 3 H2(g)}$$
the entropy change is $ \pu{ā549.4 J K^{-1} mol^{-1}}$ at $\pu{298 K}.$ In spite of the negative entropy change of ...
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Recovering from a bottle of ferrous chloride
My bottle of ferrous chloride powder/crystals was years in shelf and it turned dark brown. If I break up the clumps I can see a little bit of yellow layers. I suspect it's a combination of iron oxide ...
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Effects of dispersed nitrous oxide on the body
I'm not sure if this question would be more appropriate in Biology SE, but I wanted to know if the euphoric effects of $\ce{N2O}$ are limited to when it is concentrated in the gaseous phase, or ...
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1answer
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Electrolysis of Nacl with aluminium Electrodes
I conducted an experiment to find out the difference in products/ the final solution whilst using different electrodes. On using copper I obtained a teal blue soluble salt I believe to be $\ce{CuCl2}$ ...
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0answers
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Does back-bonding take place in CN-?
The hybridisation of C in CN- is sp and normally the -ve charge resides on the more electronegative atom , ie N. But while calculating formal charge C has a charge -1 and N 0, which indicates that C ...
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Can a ferrite magnet be impregnated with polymer to reduce its fragility?
Ferrite magnet is a ceramic material and consists of agglomerated crystalline domains with spinel structure. Like other ceramic materials, ferrite magnets are brittle. For example, here is a photo of ...
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1answer
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Can freezing temperatures cause chalk to fragment?
I am a physics student, with little experience in chemistry. I am researching for a project which involves freezing and its capabilities on humans and different minerals like chalk.
I have been ...
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2answers
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Finding the percent volume of each gas in the gas mixture [closed]
A gas mixture of $\ce{H2}$ and $\ce{N2}$ weighs $\pu{2.00 g}$ and have a volume of $\pu{10.0 L}$ at $\pu{700 mmHg}$ and $\pu{63.0 Ā°C}$. Calculate the vol.% and the partial pressures of the two gases ...
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1answer
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what is the concentration of EDTA after titration with Zinc Metal?
I take $\pu{1g}$ of zinc metal and after dissolving, diluting it to $\pu{500 ml}$ and adjust the $\mathrm{pH}$ of $\pu{50 ml}$ of it to make titration with an unknown concentration of EDTA.
I found $\...
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question about electron donor-accpetor polymer
I'm reading a paper about electron-donor-acceptor polymer.
Explaining donor unit, the paper says,
'Donor unit refers to an electron-rich unit. Thiophene and benzene are the two most basic donor units, ...
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2answers
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What do Īµā and V mean in a Pourbaix diagram?
From Wikipedia:
What does this graph mean?
What is $\varepsilon$? It looks like $\varepsilon_0$, like the vacuum permittivity, but what does this have to do with the polymorph and/or isomers of ...
