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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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1answer
27 views

A question in stiochiometry [on hold]

How many moles of $\ce{NH3}$ are there in $\pu{90 L}$ of it at STP? $4$ $32\times 10^{23} $ $23$ $3.2$ Please explain your answer as much as possible.
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2answers
47 views

MO diagram of BeH₂

I was learning about the MO diagrams of triatomic molecules and was left slightly confused about $\ce{BeH2}$. A picture of the MO is shown below: When looking at the $\mathrm{1s}$ combinations, I ...
8
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2answers
5k views

Why is the melting point of magnesium oxide higher than aluminium oxide?

There's a graph of the melting points of period three oxides. The melting point of magnesium oxide is several hundred Kelvin higher than aluminiumoxide. I can't find any explanations for this on the ...
7
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1answer
127 views

Only d orbital electrons for spin only magnetic moment

During my chemistry lessons and self studies, I have come upon many instances where I observed that during calculations of spin only magnetic moment of transition elements only the d orbital electrons ...
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0answers
15 views

Effect of Concentration on Reaction Rate - Calculating Final Concentrations in Solution [on hold]

Question asks: Determine the final concentration of IO₃⁻ used in the reaction. Show a complete sample calculation for the (8.0 mL Solution A + 2.0 mL H2O Equation: IO3− + 3HSO3− → I− + 3 HSO4− ...
21
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2answers
3k views

Storing hydrofluoric acid before the invention of plastics

The first person to synthesize hydrofluoric acid in large quantities was Carl Wilhelm Scheele in 1771. This acid is known for its ability to corrode glass and metals. What materials were the ...
0
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1answer
68 views

Terminology for describing nuclei participating in metallic bonds

I've read many times that in metals (for example sodium metal), what constitutes the crystal lattice is an arrange of atoms, since no electron is given or lost, they are just shared between all the ...
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0answers
11 views

Self-learning and improvement [on hold]

I'm a pharmacy undergraduate and I want to increase my about chemistry ,so what are the books about (organic , general, inorganic) should I read during my summer holiday?
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1answer
80 views

Products of silicate synthesis

I'm attempting to make a hard refractory cement to apply over kiln brick made of sodium silicate and Perlite. This creates a very good kiln brick, however they are susceptible to abrasion. I've been ...
3
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2answers
48 views

Precipitating silver(I) salts from the solution of barium(II) cyanate and iodide

Consider a $\pu{10.0 mL}$ solution containing $\pu{1.0e-10 M}$ each of $\ce{Ba(CN)2}$ and $\ce{BaI2}$. If $\pu{3.5e-9 mol}$ of $\ce{AgNO3(s)}$ is added to this solution, will any precipitate(s) form? ...
3
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1answer
318 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 don't understand what the difference between "glass transition" and "...
1
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1answer
37 views

Making hard water

Does anyone know how to make hard water with a hardness of 200+ ppm in terms of $\ce{CaCO3}$? I live in Seattle and we have very soft water and we need hard water for testing purposes. Obviously you ...
5
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6answers
18k views

Is dehydrating copper(II) sulphate pentahydrate a chemical or physical change?

Is removing the waters of hydration from $\ce{CuSO4 * 5H2O}$ a chemical or physical change? Sorry for the trivial question. I get varying answers across the net.
6
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2answers
2k views

Why does sodium polyacrylate solidify, on addition of water?

Sodium polyacrylate is a white powder with a characteristic odor. But when we add water to this powder, instead of forming an aqueous solution, it instantaneously solidifies and forms more amount of ...
4
votes
1answer
6k views

Which half cell equation do you switch when calculating E° cell?

Given the following standard potentials calculate the overall $E^\circ_\mathrm{cell}$: $$ \begin{align} \ce{Pb(SO4)(s) + 2 e- &→ Pb(s) +SO4^2-(aq)} &\quad E^\circ &= \pu{-0.356 V} \\ ...
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2answers
23 views

Sodium Sulfate vs Sodium Sulfite

I recently took a test and one of the questions was: Which procedures will allow a student to differentiate between solid sodium sulfate and solid sodium sulfite? I. Make solutions of each ...
0
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1answer
38 views

Change in H+ ion concentration of water on boiling [on hold]

I know that on boiling water, pH scale decreases but water remains neutral. At 100°C the pH=6.14 is neutral. And at this temperature also, the H+ ion concentration and OH- ion concentration are equal....
0
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1answer
93 views

Reason for shorter bond between sulphur and oxygen?

I recently came across this sentence in my textbook “the bonds between sulphur and oxygen in oxides of sulphur (SO2 and SO3 ) are much shorter than might be expected for a single bond” SO3 I feel ...
10
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2answers
854 views

Relative acidity of aqueous LiF, SnCl2, and YCl3

Which one of the following salts make the highest and lowest pH when dissolved in water? $$\ce{LiF, SnCl2, YCl3}$$ My approach was : considering the corresponding aqua acids, the order of acidity ...
5
votes
1answer
5k views

How dangerous is cobalt(II) chloride used in silica gel balls?

I was looking up silica gel beads on Wikipedia and noticed that some (and from experience most) are doped with a colouring agent to indicate that they have absorbed all that they can. The Wikipedia ...
0
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1answer
382 views

Is there any difference between negative electron gain enthalpy and electron affinity?

According to electron affinity, it is the amount of energy "released" during the addition of an electron in the valence shell of an isolated gaseous atom, and its sign convention is opposite to that ...
3
votes
1answer
2k views

Why does urine smell like ammonia?

Apparently, water or $\ce{H2O}$ combines in some way with nitrogen (from the air or elsewhere?) to form ammonia, or $\ce{NH3}$. Where/how in the body is this $\ce{NH3}$ (or whatever nitrate) produced ...
0
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1answer
25 views

Electrolysis - What is the basis for the discharge rules?

At the cathode, the one that is discharged is the less reactive one (compared to hydrogen) so why at the anode is the one that’s discharged more reactive (less stable) ?
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1answer
42 views

How do I get irreducible representations?

I'm currently trying to do a problem where it asks me to "show that the irreducible representations spanned by the atomic x-, y-, and z- coordinates is independent of the choice of local coordinate ...
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1answer
46 views

Why does monoammonium phosphate (MAP) have 52% of phosphorus (P₂O₅)?

The formula of monoammonium phosphate (MAP) is $\ce{NH4H2PO4}$. Manufacturers say that MAP has 10% of nitrogen (N) and 52% of phosphorus (P). However, its molecular mass is 115 u and the atomic mass ...
0
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0answers
11 views

Ionisation energies of Carbon and Boron

The first ionisation energy of Carbon atom is greater than that of Boron atom whereas, the reverse is true for the second ionisation energy. In order to explain the above statement I considered the ...
2
votes
2answers
57 views

Is [Co(NH₃)₄Cl₂]Cl paramagnetic or diamagnetic?

$\ce{NH3}$ is known to be a strong field ligand, while $\ce{Cl}$ is known to be a weak field ligand. Is $\ce{[Co(NH3)4Cl2]Cl}$ a high spin complex or a low spin complex? I assumed this to be a high ...
32
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9answers
8k views

Would it be possible to destroy gold?

I'm a writer. I have a scenario in which a sizable amount of gold needs to be rendered unusable, preferably completely destroyed. I know an acid like aqua regia is able to dissolve gold, but would ...
5
votes
1answer
45 views

Why is the Van der Waals constant of water lesser than benzene?

Van Der Waals constant of water and benzene ($a$) are $5.537$ and $18.82$ respectively. I have read that the value of Van Der Waals constant indicates the extent of attractive forces. By this, ...
0
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0answers
15 views

Preparation of Copper (II) Sulfate Pentahydrate Solution

how would you make a solution of Copper (II) Sulfate Pentahydrate to achieve 150, 200, 250 and 300 mgL−1 concentration of copper? I do not have the anhydrous version of the solute. Also, when I ...
0
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2answers
20 views

Influence of pH on precipitate crystallite sizes?

It's normally assumed that a higher pH of solution would slow nucleation rates and hence lead to larger crystal formation. I've found literature that it is due to solid-liquid inter-facial tension. ...
1
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1answer
29 views

Equation for reaction between chlorine fluoride and potassium bromide

The equation given in the answer key was $$\ce{ClF + 2KBr → KCl + KF + Br2}$$ However won't the $\ce{KCl}$ also react with $\ce{ClF}$ to form $\ce{KF}$ and $\ce{Cl2}$, resulting in the net reaction ...
0
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1answer
206 views

How to find the combining valence of an anion when it exhibits variable valency?

I'm doing an online course and can't for the life of me figure out how to write chemical formulas from the chemical name. Take the example of calcium chloride. I know the the valence for calcium is ...
5
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0answers
2k views

Bond angle order of SF2, OF2, HOF

Arrange the following componds in the increasing order of bond angle. $$\ce{HOF,~OF2,~SF2}$$ I know that bond angle of $\ce{SF2}$ will be less than the bond angle of $\ce{OF2}$ because of larger ...
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0answers
47 views

How to balance more complicated chemical equations [closed]

This is my equation $$\ce{?Mn(NO3)2 + ?Pb3O4 + ?HNO3 -> ?HMnO4 + ?Pb(NO3)2 + ?H2O }$$ The answers to the blank spaces are 2, 5, 26, 2, 15, 12 in order. I have no idea to get to this result. I ...
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1answer
45 views

What is the crystal structure of bismuth oxyhydroxyphosphate (BOHP)?

The recent Chemical & Engineering News article Photocatalyst shreds drinking water contaminant PFOA report the following: Cates and his colleagues made an accidental breakthrough while testing ...
3
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1answer
18 views

Electronic configuration of the actinides

I was reading about actinides and I need some help in understanding this paragraph from Concise Inorganic Chemistry by JD Lee - The electronic structures of the actinides do not follow the simple ...
0
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0answers
27 views

Why does Nitric acid not dissolve Fe2O3? [on hold]

I tried to dissolve $\ce{Fe2O3}$ in hydrochloric and nitric acid. Both were slightly dilute and heated till boiling. Only hydrochloric acid worked. Why? (Please don't just look up solubility ...
3
votes
1answer
61 views

Hydrate decomposition equation steps

When a hydrate decomposes it loses water molecules in steps. Does each step have a chemical equation? If so is the following equations for decomposition of cupric sulfate hydrate correct? $$ \begin{...
4
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0answers
645 views

What is the hybridisation state of the sulfur atom in S4N4F4?

The molecule is shown in the textbook as: I can rationalise that the N is sp2 hybridised with a single electron in the p-orbital perpendicular to the plane of the S/N ring. (The sp2 lone pair is ...
2
votes
2answers
219 views

What happens to iron electrodes (attached to a battery) in copper(II) sulphate solution?

After a few hours, the following observations were made: The solution turns green. My guess: $\ce{FeSO4}$ is formed. There are reddish-brown and black powder deposits on both the electrodes. The ...
5
votes
1answer
121 views

HDEHP and complexes formed in extraction

I did an solvent extraction of $\ce{Eu(III)}$ using $\ce{HDEHP}$ from nitric and hydrochloric acid solutions to determine which acid, and which concentration, will yield the highest distribution ...
0
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1answer
67 views

What does thermal stability of compounds depend on?

Does it somehow depend upon the lattice energy of the compound? My textbook says that Lithium carbonate is not so stable to heat and forms more stable $\ce{Li2O}$ and $\ce{CO2}$. Could it depend on ...
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1answer
154 views

Thermal stability order of NaF, MgF2 and AlF3

I came up with a question to arrange thermal stability order of $\ce{NaF}$, $\ce{MgF2}$ and $\ce{AlF3}$ and I think the answer is $\ce{NaF>MgF2>AlF3}$ because $\ce{Na+}$ has largest ionic radius ...
0
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0answers
21 views

Making a tartaric acid solution & Fe(III)nitrate nonahydrate solution? [closed]

I submitted a proposal for an experiment for my lab class, and the teacher stated that I needed to make a 100 mL solution of tartaric acid solution and Fe(III) nitrate nonahydrate solution. Could ...
2
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0answers
129 views

OF2 vs O2F2 oxidising strength

My teacher said that OF2 is the third most powerful oxidising agent after F2 and atomic O, but I think O2F2 should be even more oxidising, since it less stable than OF2. I just read on quora that O2F2 ...
1
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2answers
46 views

Materials used in cooktop heating element, and reason for black appearance

I have been interested in the structure of heating elements/coils used in cooktops. I am referring to something such as in the following picture: I have a cooktop at home with such elements, and at ...
1
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1answer
50 views

Negative oxidation state

Why doesn’t aluminum have negative oxidation states? In almost all compounds of aluminum which I know of has positive oxidation state. It has valence EC [Ne] 3s2 3p1 , my teacher told it usually ...
0
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0answers
19 views

Creating solution and dilutions for Beer Lambert Lab

I am working on designing a lab which is heavily based on solutions but is setting up for a Beer-Lambert experiment. The first part of the lab requires us to make a 100 micromolar iron solution, to do ...
1
vote
1answer
67 views

Help with finding the right catalyst and reaction conditions for hydroamination reaction

A friend of mine, final year PhD, and I, final year Bachelor, are focusing on hydroamination reactions. In particular those with secondary amines and substituted alkenes. The reaction in particular is ...