Tagged Questions

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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Help with concentration calculation & partial pressure

I have been charged with answering the following: Please could you calculate the partial pressure of $\ce{H2S}$ at pH7, 105 bar pressure at 30 ppm $\ce{S-2}$ My attempt so far: $\ce{H2S + H2O ...
4
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0answers
31 views

CO2 removal from mushroom growing tent

I'm trying to grow oyster mushrooms that like high temperatures. They look great in an indoor terrarium, and can eventually yield several tasty meals :) However oyster mushrooms are hard to grow ...
2
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0answers
22 views

How does the radial distribution function of Vanadium differ from that of Calcium and how does this affect the ionic electron configurations?

When Vanadium is ionised it loses the 4s electron first, meaning that it's 3+ ion has a different electron configuration to Calcium despite it being isoelectronic. Can it be explained in terms of ...
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0answers
24 views

Why nitrogen is inactive but oxygen is more active? [on hold]

Why is nitrogen, being the major component of the atmosphere, inactive but oxygen, the minor component, is most reactive? As per Le Chatelier's principle, if the concentration of a reactant is much ...
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0answers
17 views

Using knowledge of radial distribution functions, how is it possible to explain the different electron configurations of V3+ and Calcium [duplicate]

I recognize that the 3d orbital decreases in energy to lower than the 4s once it becomes occupied (even if I don't completely understand why?!). However, how is the difference in electron ...
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0answers
10 views

Devitrification vs glass transition temperature

This graph comes from a so-called "differential thermal analysis". It is studying the effects of temperature on glass. I dont understand what the difference between "glass transition" and ...
3
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1answer
65 views

Why are all the orbitals that have the same principal number in Hydrogen degenerate?

In hydrogen, all orbitals with the same principal quantum number 'n' (1,2,3...) are degenerate, regardless of the orbital angular momentum quantum number'l' (0,1...n-1 or s,p,d..). However, in atoms ...
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1answer
30 views

Is there a heat capacity of an object when it is melting?

Is there a heat capacity of an object when it is melting? I'm questioning it since the temperature doesn't change during phase transitions and the units of heat capacity is Joules/Kelvin.
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18 views

Determination of acid contents in sour fruits project? [on hold]

Determination of acid contents in sour fruits project? Any idea about it or any references.
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0answers
11 views

group 13 variation in periodic properties in the periodic table

Why are there so many ups and downs in the boiling and melting points of element in group 13? is there any explanation at all? I have searched and searched and searched but the internet has nothing on ...
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1answer
26 views

Is atom-clean aluminum active enough to react with alkali salts?

Thermally evaportated $\ce{Al}$ under high vacuum is free of oxidized species and highly active. But is it active enough to even substitute the alkali cationic metal in alkali salts, like $\ce{LiOH, ...
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0answers
30 views

How do I calculate the molar mass of an unknown gas?

A piston is placed in a closed tube. To the left, there is Hydrogen Gas at 400K and 4 atm. To the right, there is an unknown gas at 200K and 2 atm. At equilibrium, the piston is at 1/3 of the length ...
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1answer
84 views

Determine what the unknown element is

A piece of electronic equipment originally contained 1.250 g of a valuable metal. Corrosion over time has given a compound of formula $\ce{M(OH)3}$, which is isolated but not weighed. This compound is ...
2
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1answer
25 views

How effective is sulfur in detecting mercury vapors

I've read that powdered elemental sulfur will react to the presence of mercury vapor in the air creating red mercury sulfide, and that an open container of sulfur can be used as a means to verify ...
2
votes
1answer
49 views

Precautions and tips for Qualitative Inorganic Analysis of Coins

I'm a highschool student and as part of an investigatory project, I have decided to analyse which metals are present in our everyday coins. I chose this because in my previous academic year, I had ...
1
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1answer
24 views

Are the rules proposed by slater for the calculation of Z effective right?

Today, I studied Slater's rules for calculating the effective nuclear charge. But, one particular line " The shielding power of the d and f orbital is lesser in comparison to the p and s orbitals" ...
2
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1answer
23 views

A metal Q forms a carbonate and a nitrate. What is the molecular formula of the nitrate of Q?

Good day. This is my first post in any chemistry site. A metal $\ce{Q}$ forms a carbonate and a nitrate. The molecular formula of the carbonate of $\ce{Q}$ is $\ce{QCO3}$. What is the molecular ...
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0answers
44 views

Irreducible Representations to Classify Atomic Orbitals [duplicate]

I have some major confusion on Irreducible Representations. An example of a problem i have is Based on the character table for the point group of each of the follwing molecules, which irreducible ...
5
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1answer
76 views

Cyanide ion non-bonding/lone pair?

Where's the lone pair on the cyanide anion in this MO diagram? In the traditional Lewis picture there are two lone pairs on the cyanide ion. In the MO diagram though there appear to be no ...
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1answer
28 views

Enclathrated - definition?

When discussing the solvent uptake of a metal-organic framework would the correct term be "solvent molecules were enclathrated into the pores"? Despite searching for a definition online I have drawn a ...
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0answers
47 views

Is it dangerous to live near lead? [duplicate]

Several month ago, I soundproofed the door of my room with two sheets of lead. Can it be dangerous to live with them for many years? Can lead "decay" in some way and be inhaled? (and what happen when ...
5
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2answers
61 views

How to determine peroxy oxygen?

Which of the following compound doesn't contain peroxy oxygen? $\ce{CrO5}$ $\ce{Cr2O3}$ $\ce{Na2O2}$ $\ce{BaO2}$ I think peroxy oxygen peroxide(am I right?). I have read in this answer that there ...
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0answers
24 views

Copper and Hydrochloric Acid: Reaction or No Reaction? [duplicate]

In my chemistry lab, we had $18$ different reactions involving many different substances. One of the experiments involved placing a piece of copper metal in a hydrochloric acid. While observing it ...
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2answers
48 views

Can I make Cobalt Violet with these materials?

I'm given $\ce{CoCl2*6H2O}$ as well as $\ce{Na3PO4*12 H2O}$ The chemical formula for Cobalt Violet is $\ce{Co3(PO4)2}$. I haven't done stoichiometry in a long time but I think that's creatable, ...
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1answer
61 views

How to recover 15g gold from 50 gallons of 30% Acid?

Someone mistakenly poured a solution containing $15\mathrm{g}$ of gold into a nearly full waste drum that is around $30$% $\ce{HCl}$ with a little nitric acid in there as well. Is there a safe way ...
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1answer
53 views

Is there a compound that binds with salt (NaCl) in solution? [closed]

Is there a non-toxic compound that binds with $\ce{NaCl}$ in a water medium?
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3answers
229 views

Is heating Copper Sulphate hydrate a chemical or physical change?

Sorry for the trivial question. I get varying answers across the net.
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2answers
43 views

How to recognize Barium sulphite?

Yes it's a white ppt which is soluble in dil. $\ce{HCl}$, but I'm not sure which of the following happens: $$\ce{BaSO3 +$dil.$HCl->Ba(HSO)3 +Cl-}\tag1$$ $$\ce{BaSO3 +2H+->Ba^2+ +SO2 ^ ...
5
votes
1answer
67 views

dissociation rates: trans-effect rule in square planar complexes

In lecture we became an easy description of the trans-effect. A ligand $ \ L^t \ $ with a higher trans-effect as $ \ L \ $ ( cis to $ \ L^t \ $) leads to a faster dissociation of ligand $ \ L^d \ $ ...
2
votes
3answers
44 views

Colour of Nickel thiocyanate

What is the colour of $\ce{C2N2NiS2}$ (Nickel thiocyanate)? In most of the web sites it only molecular weight,formula and other specifications but its colour is missing every where.
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0answers
23 views

Central Atom in EXAFS

I read somewhere that EXAFS (Extended X-ray absorption fine structure) gives us the distances between central atom and its neighboring atoms. Is that true? Why can't we get the distance between two ...
4
votes
1answer
66 views

Why is KF the most ionic compound?

I saw somewhere (can't recall where) that KF is the most ionic compound. I expected CsF. Does the greater polarizability of Cs allow it to more easily form covalent bonds compared to K? Does this ...
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votes
1answer
99 views

Are there ligands without lone pairs? [closed]

The Nitronium ion, which is a positively charged ligand, in which the donor atom is Nitrogen. The question is, that Nitrogen has a total of 5 electrons, it shares 2 with oxygen and donates 2 electrons ...
3
votes
2answers
71 views

How to get back my beautiful crystals made from iron and sulphuric acid

I have put some old nails and screws in the 30% sulfuric acid to prepare an electrolyte for plating. After some bubbling and horribly irritating smell (probably $\ce{SO2}$), the reaction slowed down. ...
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1answer
53 views

Determining perovskite crystal structure

I've been reading that perovskite presents a sort of pseudocubic crystalline system, however it can be stretched and suffer modifications to become orthorhombic etc. The thing is, if I consider it ...
7
votes
1answer
166 views

Which is more basic, hydrazine or ammonia?

Which of the following will be more basic, hydrazine $\ce{H2N-NH2}$ or ammonia $\ce{NH3}$? My chemistry teacher said that $\ce{NH3}$ is more basic since after giving $\ce{H+}$ to hydrazine results in ...
3
votes
1answer
28 views

How does steric hindrance cause sulphur hexafluoride to have almost no reaction chemistry?

Sulphur hexafluoride ($\ce{SF6}$) is, according to the Wikipedia page, a hypervalent substance. However, according to the page in regards to $\ce{SF6}$ reactions: There is virtually no reaction ...
6
votes
4answers
634 views

Why does K+ have 0 valence electrons?

If we take a K atom and take away an electron why does it now have 0 valence electrons as it states in my General Chemistry textbook? I would think that if we do this, it would have the same exact ...
1
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1answer
60 views

reaction with Barium Chromate, Potassium nitrate

I'm confused, in the reaction:$$\ce{K_2CrO_{4(aq)} + Ba(NO_3)_{2(aq)}\rightleftharpoons BaCrO_{4(s)} + 2KNO_{3(aq)}}$$ I got a white precipitate in an opaque yellow solution and I was told that the ...
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1answer
26 views

Seeking word equations

is there a general word equation so I can learn how to write out the following: With chlorine, it seems to be: Hydrocarbon + Chlorine ---> ____ + HCL With Hexane, it seems to be: Hydrocarbon + Br ...
2
votes
3answers
105 views

Oxidation State of Oxygen in Na2O2?

I am asked to determine what is the O.S. of Oxygen in $\ce{Na2O2}$ I was under the impression that oxygen had a charge of -2 and I multiplied that charge by 2 giving me an Oxidation # of -4. ...
2
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0answers
27 views

Is there a compound where one element has a CCP structure with all voids occupied by others?

My Google-fu hasn't got me anywhere. All results have been quite fuzzy about it, nothing explicit.
6
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4answers
428 views

Mathematics in inorganic and quantum chemistry

Is mathematics important to learn concepts in inorganic chemistry, such as point groups, point symmetry, because doing these topics requires one to determine the symmetry of the elements and to ...
1
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3answers
75 views

HCl and KMnO4 reaction

I don't get how does this reaction proceed: HCl + KMnO4 = KCl + MnCl2 + Cl2 + H2O What I know: 1) HCl dissociates into H+ and Cl-. 2) KMnO4 dissociates into K+ and MnO42- What I don't get: How ...
4
votes
1answer
76 views

Determining the Packing Geometry of Compounds

I'm a little confused on the method to determine packing geometry. The question I'm given is Determine the packing geometry of the following compounds by using the radius ratio rules. For your ...
53
votes
3answers
9k views

Why is gold golden?

Bulk gold has a very characteristic warm yellow shine to it, whereas almost all other metals have a grey or silvery color. Where does this come from? I have heard that this property arises from ...
1
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1answer
34 views

Letting Copper sit in NaOH for 5 min (for monolayer assembly)

i made a self-assembled monolayer of dodecanethiol on copper, before that i let the copper in a solution of $\ce{NaOH}$ for 5 min, and i need to know what this step is for, anyone can help me?
4
votes
3answers
69 views

Where to find common inorganic/organometallic molecules?

I'm working on a project to create a large open repository of quantum calculations, largely for teaching purposes. I can get thousands of common organic compounds easily from sources like PubChem or ...
0
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2answers
43 views

Which water-soluble, alkaline oxide is formed? (Multiple choice question)

An element burns in oxygen to form a solid oxide which dissolves in water. The pH of the resulting solution is greater than seven. Which one of the following could the element be? A. sulphur B. ...
1
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1answer
129 views

Copper Doesn't React with Hydrochloric acid

5) Which one of the following metals does not react with hydrochloric acid? A. zinc B. magnesium C. iron D. copper E. aluminium The right answer must be copper but my question is why does Copper ...