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6 views

Why a single covalent bond is stronger than a single ionic bond?

As explained by my teacher a single ionic bond is always weaker than a single covalent bond. Due to lattice formation the ionic compounds have high melting point and boiling point. Is it beacuse ...
-3
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1answer
6 views

combination of H2 and O2 after electrolysis

if we electrolysis water in a closed container H2 and O2 is formed, now as the container is closed both gases remain there when the electrolysis stop and water cool down will h2 and o2 remain in the ...
0
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0answers
12 views

Finding the pH of a buffer from the scratch without the Henderson Hasselbalch equation

I found this question on the internet that said: Find the pOH of the solution obtained by mixing 0.1 moles of $\mathrm{NH_4 OH}$ $(K_b = 10^{-5})$ and 0.1 moles of $\mathrm{(NH_4)_2 SO_4}$ in a 500mL ...
-3
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0answers
14 views

Can any one list the set of fundamental unsolved questions in coordination chemistry? [closed]

I am interested in unsolved problems in coordination chemistry, from particular cases to the most fundamental phenomena. Thanks in advance
2
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0answers
16 views

What does fractional notation represent in molecular formulas such as SiO4/2 or H2SiO2/2?

I'm going through some papers about HSQ (hydrogen silsesquioxane) and keep seeing this fractional notation being used: HSiO3/2 , SiO4/2 , H2SiO2/2 , H3SiO1/2. Example paper. I understand that the ...
1
vote
0answers
15 views

Why is ethanol, water and amonium needed for DMG to react with nickel?

I had this question on a test and I'm unsure on why ethanol is required for the reaction. I understand that you need the ammonia and water to make oxonium ions needed for the reaction to occur. We had ...
1
vote
0answers
14 views

Is the effective nuclear charge only defined for valence electrons?

I've just been taught about the effective nuclear charge and screening effect in school. I'd like to ask and confirm if the z is only defined for valence electrons, if not then why don't we consider ...
0
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0answers
24 views

pH for an HA/NaA solution using a contour map

The following question has troubled me for a while now. A virtual weak acid $\ce{HA}$ dissociates as follows: $\ce{HA <=> H^+ + A^-}$ with the acid dissociation constant $K_\mathrm{a} = 10^{-3....
-2
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0answers
11 views

How does air tight objects stick to walls or any other object? [closed]

How does air tight objects stick,what is the mechanism behind it
-4
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0answers
9 views

10 g of Carbon is burnt with 22g of O2 to produce both CO and CO2 without any Limiting Reagent. Find mass of CO and CO2 produced [closed]

I read a question as stated above. Is this reaction even possible because as far as I know CO is only produced when there is not enough oxygen. In case it is correct, please provide me with an answer.
1
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0answers
24 views

Does Copper(I) Iodide have a dimer?

A qualitative test for the iodide ion involves reacting the salt solution with copper sulphate. This is said to yield the triiodide ion and the white precipitate of $\ce{Cu2I2}$. I haven't been able ...
-1
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1answer
16 views

Enantiomers and diastereomers

I don't understand why on the problem a. B and C are enantiomers, while on the problem b. B is identical to the last molecule.
3
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1answer
23 views

Oscillator Strength and Absorption Intensity in TDDFT

When I run a linear-response time-dependent DFT calculation in my favourite electronic structure program, for each excitation I'm given an oscillator strength, $f_i$, and transition dipole moment $$\...
1
vote
0answers
11 views

How are ions distributed in solutions? What are their surface area to volume ratios, impact on heat transfer capability, compared to nano-particles?

If I were to dissolve silver nitrate in water, I would get $\ce{Ag+}$ and $\ce{NO3-}$ ions distributed in the solution. Will they be distributed as aggregates of positively charged silver and ...
1
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0answers
14 views

Reason for different chemical shift in chiral solvents for enantiotopic protons

The chemical shift of enantiotopic protons is defined as follows in Spectroscopy/Homotopic, Enantiotopic, Diastereotopic Enantiotopic protons have the same chemical shift in the vast majority of ...
2
votes
1answer
23 views

Oxidizing properties of sulfuric acid: can it oxidize hydrochloric acid to chlorine?

Can $\ce{H2SO4}$ oxidize $\ce{HCl}$ to $\ce{Cl2}$? I know that $\ce{KMnO4}$ can do it, but my question is considering $\ce{H2SO4}$. In sulfuric acid, sulphur is in +6 oxidation state and in $\ce{KMnO4}...
1
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2answers
28 views

Finding major product after dehydration

here,should I prefer hydride shift or a product with more $\alpha$ hydrogens? my doubt is...as hydride shift is easier than methyl shift,the answer should be $a$ or $c$.if methyl shift takes place the ...
-1
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0answers
22 views

Can we create metals and/or elements artificially, sufficiently enough to replace or eventually replace mining?

Before you answer the question, please note I am not a chemist or a physicist, I'm simply curious. My question is in the context of scarcity. Is it possible to artificially create materials such as ...
2
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0answers
18 views

How to compare volatility of inorganic acids

Extending This question further Sulfuric acid because of its low volatility can be used to manufacture more volatile acids from their corresponding salts To use this statement in practice I need to ...
-3
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0answers
11 views

Electron configuration using periodic table [closed]

I need to find electron configuration for an element beyond 118 (I don't want to tell the element's atomic number 'cause I need to find the electronic configuration). I'm able to find electronic ...
1
vote
0answers
21 views

Confusion regarding Finkelstein Reaction

In Finkelstein reaction we know when a primary alkyl chloride or bromide is treated with NaI in acetone, we get the corresponding alkyl iodide Now acetone is a polar aprotic solvent and order of ...
-1
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0answers
19 views

Does dissociation produce a mixture?

I was wondering why a a salt that dissociates in water will be a mixture? The definitions for a mixture says that "Components do not chemically react with each other." Isn't dissociation ...
-1
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0answers
36 views

Which has maximum number of oxygen atoms? (A) 1 gm of O (B) 1 gm of O2 (C) 1 gm of O3 (D) All have same no. of O-atoms [closed]

Which has maximum number of oxygen atoms? (A) 1 gm of O (B) 1 gm of O2 (C) 1 gm of O3 (D) All have same no. of O-atoms Please explain with the reason !
-2
votes
1answer
30 views

Phenolphthalein + sodium carbonate and phenolphthalein + sodium bicarbonate [closed]

What would the word equations be for the following two situations? Initially $\ce{Na2CO3}$ and $\ce{NaHCO3}$ were present as 2 unknown powders, dissolved in water, and phenolphthalein was added to ...
0
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0answers
20 views

Why does increased conjugation in a molecule cause the wavelength absorbed to decrease (i.e. why does a red-shift occur)?

I was recently looking at a paper about novel organic dyes for efficient dye-sensitized solar cells and one point the authors made was that out of the two dyes mentioned the one with a larger pi-...
8
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0answers
41 views

Using symmetry and group theory arguments to explain iron(II) in a tetrahedral crystal field

I am trying to figure out how to explain $1s \rightarrow 3d$ spectroscopic transitions for $\ce{Fe^{2+}}$ in $T_\mathrm{d}$ symmetry. These transitions make up the pre-edge region in K edge X-ray ...
-3
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0answers
16 views

Le Chatelier’s Principle chem [closed]

How would I answer a question like this on a test? Removal of one of the products of a chemical reaction has the effect of causing the reaction to go to completion. Explain this in terms of Le ...
0
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1answer
28 views

Synthesis of 1-naphthaleneacetic acid: Methods

I am trying to synthesizing 1-naphthaleneacetic acid from naphthalene and monochloroacetic acid. I found some patents and papers, and I have tried to synthesis but the yield is low. I used iron powder ...
0
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0answers
26 views

How to write the Nernst Equation for this reaction?

I am required to write the Nernst equation for the following reaction: $\ce{O_2 + 4H^+ + 4e^- -> 2H_2O}$ Clearly, here $\ce{O_2}$ is getting reduced from an oxidation number of zero to an ...
-2
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1answer
29 views

I need to find the mechanism of a reaction [closed]

As in the title, I have a reaction to witch I need to give the mechanism.
-2
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0answers
19 views

Why is F a bad leaving group? [closed]

Why is F a bad leaving group? I thought that a good leaving group is one that tends to leave easily (=strong acid or weak base) and is stable (ergo a weak base or a strong acid). So wouldn't F be a ...
-1
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0answers
25 views

Which human protein is the most expensive energetically for the human body to create? [closed]

The human body contains between 80,000 and 400,000 different kinds of proteins. Which protein or class of proteins requires the most energy to produce?
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0answers
14 views

Could ammonium phenolate be merely a solution of ammonia in phenol?

Could ammonium phenolate be merely a solution of ammonia in phenol? Ammonium phenolate (or phenoxide) is a liquid with a CAS number, 5973-17-1, and boiling point of 181.8$^o$C http://www.chemnet.com/...
8
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0answers
45 views

Why does calcined feldspar crumble?

For context, I am a potter and am interested in collecting and processing all materials that I use by myself. One of the processes which I use is calcination of certain minerals like feldspar, so that ...
-1
votes
1answer
19 views

Le Chatelier’s principle Chemistry question [closed]

In caves we sometimes see large structures known as stalactites and stalagmites. These formations are made of crystals of the insoluble compound calcium carbonate, CaCO 3 (s), also known as limestone. ...
-3
votes
1answer
21 views

Volume percentage [closed]

When we say that nitrogen occupies 78% , oxygen 21% and other gases 1% by volume of the total volume of air, what do we actually mean by it? I am confused because I have been told that molecules of ...
-1
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0answers
14 views

Mechanistic detail for Dehydration of benzaldoxime with acetic anhydride reaction [closed]

Please draw out and explain the mechanism for Dehydration of benzaldoxime with acetic anhydride rection. I'm struggling to find anything about it. Thank youuu :)
2
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0answers
27 views

Titration of weak acid and strong base at low concentrations [duplicate]

Titration continues until one of the reactants (the one in conical flask) turns out to be a limiting agent as far as I know. From the titration of a weak acid and a strong base, I could learn that the ...
-3
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0answers
35 views

Acids give H+ in a reaction thus called reducing agent. But according to Lewis theory of acid and base, anything accepting pair of electron is acid [closed]

Now as acids accept electrons and so must be called oxidizing agent. and I feel it to be a bit contradicting. please clarify if any misconception
0
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2answers
48 views

How does copper oxidise alcohols?

Consider for example ethanol being heated in the presence of copper at 300 °C. How does it give ethanal as a product? Copper being in its elemental state (oxidation state 0). Since negative oxidation ...
-1
votes
0answers
32 views

Comparing rate of dehydration [closed]

First I made the products and tautomerised them As the conditions for dehydration are not mentioned so I assumed acidic conditions. This means that all the compounds would follow $E^1$ mechanism. This ...
3
votes
1answer
37 views

Relative humidity and vapor-pressure in equilibrium

I have quite an unclear understanding of relative humidity. I am writing my understanding on the topic and please correct me wherever I'm wrong: What I understood: Let's say $\ce{H2O}$ has a (...
0
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0answers
24 views

Preparation of phosphate buffer of ph 7.4

Can I make a phosphate buffer of pH 7.4 starting with phosphoric acid and then adding NaOH until the pH reaches 7.4. What are the disadvantages of using this method over sodium phosphates?
-3
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0answers
17 views

Contrast the unstable electron-deficient cationic intermediate with the stable pyridinium ion [closed]

Why is the pyridinium ion not unstable, such as an unstable electron-deficient intermediate cation in electrophilic aromatic substitution, after the pyridinium ion has a positive charge on nitrogen?
1
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0answers
42 views

Determining priority on a cyclic compound

I have problem in determining the SIP priorities in this molecule: In this ketamine molecule, what is the order of priorities? Does the carbon bonded to the ring with chlorine have higher priority ...
8
votes
1answer
370 views

(E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-2-iodobut-2-ene

I am struggling with naming this structure either (E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-2-iodobut-2-ene. I am aiming at the question whether there is also a ...
-1
votes
0answers
45 views

How can I weigh the compound that melts at room temperature?

I am conducting an organic synthesis experiment involving 2,3,5-tribromothiophene. The melting point of 2,3,5-tribromothiophene is about 25-28 ℃, so it melts easily during weighing. Whenever I weigh ...
-2
votes
0answers
21 views

Determining the direction of electron transfer in a coordinate bond [closed]

I am curious as to how electron transfer takes place in a co-ordinate bond in complexes. Take for example, the nitrito-$\ce{O}$ molecule, where $\ce{M}$ is a metal, $$\ce{M<—O—N=O}$$ In the ...
-2
votes
0answers
14 views

How to find the percentage yield of hydrated copper(ii) sulfate [closed]

Hydrated crystals of copper(ii) sulfate-5-water were prepared by the following reactions CuO(s)+H2SO4(aq)= CuSO4(aq)+H2O(l) CuSO4(aq)+5H2O(l)= CuSO4 • 5H2O(s) In an experiment, 25.00cm3 of 2.0mol/dm3 ...
-3
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0answers
14 views

Why (abundance of M+1)/(abundance of M)=(number of carbon atoms)*(1.1/100)?. Why simple unitary method and arithmetic doesnt work? derive the formula [closed]

what is the proof of the formula and how the formula works? why combinatorics and distributions have been involved in the calculation? why cannot we find the number of carbon atoms just by using ...

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