# All Questions

28,882 questions
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### Deciphering UV degradation in PS with the addition of ketones [on hold]

Theory in question The way I see it (with my very basic Mechanical Eng. chem knowledge) is that: ...
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### Is it possible for neon to bond with arsenic? [on hold]

I'm writing a comic involving the periodic table and I would like it to be semi-accurate. So I'm wondering, is there any way that neon and arsenic can bond?
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### how do I find out the bond type of NO3-1 [on hold]

I need help finding out how to determine the bond type. I am also struggling with bounding domains/ non bonding domains, 3-D structure, and polar Molecule
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### What is the byproduct of a reaction between copper sulfate pentahydrate, sodium carbonate, and elemental iron when heated? [on hold]

This is entirely a curiosity of mine that requires an answer and not an actual experiment or documented reaction, so far as I can find. I was looking for a professional to inspect/clean a wood stove ...
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### Titration Problem [on hold]

If 22.90 mL of 0.115 M barium hydroxide is required to neutralize 28.3 mL of nitric acid, what is the molarity of the acid? $\ce{2HNO3(aq)}+\ce{Ba(OH)2(aq)→Ba(NO3)_2(aq)}+\ce{2H2O(l)}$ Express your ...
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### Which effect is more dominating between hyperconjugation/no bond resonance and normal resonance?

In between hyperconjugation and resonance , is resonance effect always the dominating effect ? In the above example , the 1st structure has 9 alpha hydrogens and thus 10 hyperconjugative structures....
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### Mention What change in colour will occur to each compound in both cases? And why? [on hold]

We got 4 test tubes. Each was filled with one of the following compounds: Iron (II) sulphate, Iron (III) sulphate, manganese (II) sulphate and manganese (III) sulphate then left in open air for enough ...
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### Ice in Hot Water Thermodynamics Question [on hold]

If I put ice in a container of hot water (container has rigid, sealed, and insulated walls such that there is no heat transfer between the ice-water system and the surroundings), then what would ...
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### Creating a Battery using azobenzene in High School

I’m doing a project on isomerization in high school and have stumbled across the studies involving azobenzene in energy storage using its photoisomeric properties and sunlight . Do you think that this ...
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### Simple alternative to UNIFAC to prove that a mixture containing 1ml of x and 5 litres of propylene glycol is not flammable?

Section 2.6.1 of the REGULATION (EC) No 1272/2008 (CLP) defines a flammable liquid as: Flammable liquid means a liquid having a flash point of not more than $60 ^{\circ}$C. So data on flash ...
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### Removing fluorine from water [on hold]

The "Boy Scout" water purification kit now contains iodine and ascorbic acid. The iodine kills microorganisms present. The ascorbic acid (a chelating agent) has been added to this new "Boy Scout" ...
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### Conversion of primary amine to alcohol [on hold]

I need to convert this primary amine to alcohol and later to bromide, any ideas? I am stuck on the first part. Stereospecificity would be nice, but it's not necessary. Thanks a lot!
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### Justify the statement; an increase in electronegativity leads to an increase in ionization energy [on hold]

I need a top answer for this question and it should not be long it should be short and simple answers so that it's easy to remember Thank you
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### Which unit of length for visible light [on hold]

When is it appropriate for the measured spectrum of light to be expressed in nanometers and when in Angstrom units?
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### cleaning annealed copper pieces with hydracloric acid [on hold]

I am cleaning copper after annealing with acid from toilet bowl cleaner(hydrochloric acid). It works well but there is a small residue to polish off by wire brushing or sanding. Is this residue ...
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### Chemical formula of fluoroapatite

My textbook says the formula for fluoroapatite is $\ce{CaF2 * 3Ca3(PO4)2}$, whereas according to Wikipedia it's $\ce{Ca5(PO4)3F}$. What is the correct chemical formula of fluoroapatite and why there ...
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### Significance of lowering of vapour pressure [on hold]

What is the significance t Of lowering of vapour pressure..? Can we write lowering of vapour pressure as a colligative property in the answer of this question?
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### How to reduce specific gravity of a brine solution? [on hold]

We have prepared a brine solution ($\ce{NaCl}$ + water). Its present specific gravity is more than 30 percent. We need to keep the specific gravity between 28 and 30 percent. Should we add more water ...
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### Organic chemistry--Alcohols [on hold]

A liquid Was mixed With CH3OH and a drop of Conc.H2SO4 is added. A compound with fruity smell is formed ..then the liquid is??? x+ CH3OH reacts with Conc H2so4 to form a compound with Fruity Smell ...
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### the percentage of C and H [on hold]

on complete combustion of 0.25 gram of an organic compound 0.22 gram of CO2 and 0.18 gram of H2O are obtained. the percentage of C and H respectively in the organic compound are
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### Electronic configuration of d5-d-10 in terms of t2g and eg in an octahedral field when delta O is smaller than pairing energy?

As per the Crystal Field Theory, d4 splits into t2g3 and eg1 when delta 0 < Pairing energy. What about d5, d6 and so in the same case? Does the fifth, sixth... electrons enter the t2g or eg ...
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### Under sn1 conditions which will be more reactive secondary butyl chloride or isobutyl chloride?

I have doubt that isobutyl chloride forming a primary carbocation will rearrange very fast to a tertiary carbocation which will be more stable than carbocation formed by secondary butyl chloride. So ...
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### Structure of pyrophosphorous acid

What is the structure of pyrophosphorous acid? I asked this question here because the answer which I found on web and other resources are inconsistent which each other. For example, following data is ...
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### Using significant figures to imply the stated error [on hold]

The question reads; Express each of the following quantities, using significant figures to imply the stated error. (a) $3.6965 \pm 0.02$ (b) $25600 \pm 10$ (c) $56200 \pm 100$
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### Precipitation of AgCl from the tap water solution of the group 2 chloride

I had this question about an experiment where the group 2 chloride was dissolved in distilled water and excess $\ce{AgNO3}$ was added to the solution to form $\ce{AgCl}$ precipitate. One of the sub-...
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### Why V³⁺/V²⁺ couple has low reduction potential?

$\ce{V^2+}$ ion is more stable than $\ce{V^3+}$ because of the half-filled $\mathrm{t_{2g}}$ level. So, shouldn't the reduction potential be high?
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### Why does the beryllium 2+ ion have a larger radius than a helium atom?

$\ce{Be^2+}$ has an ionic radius of $\pu{45 pm}$, while $\ce{He}$ has a radius of only $\pu{31 pm}$. If they are isoelectronic (they both have two elections in the $\mathrm{1p}$ orbital), and $\ce{Be}$...
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### Behavior of molecules at absolute zero [on hold]

Can we say that at absolute zero temperature a gas like $\ce{CO2}$ will be separated into the constituent atoms and after that all of them will solidify devoid of any potential or kinetic energy as ...
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### Co-ordination bond, Valence Bond Theory [on hold]

For Co(iii) ions when a weak ligand approaches (F), there is formation of sp³d² hybrid orbitals where only 2 d orbitals are going hybridisation, why can't all the 5 d orbitals participate in ...
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### Estimating the absolute entropy of water at room temperature

I thought it would be fun to get an idea of how enormously large $W$ in $S = k\ln W$ is. I'd specifically like to estimate this for a mole of water at $\pu{1 atm}$ and $\pu{298 K}$. To do this, I ...
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### Conflicting definitions of Lewis acids

I have struggled in attaining a solid grasp of the Lewis acid/base concept largely because so many sources seem to offer conflicting definitions. For instance, Klein's Organic Chemistry mentions that ...