All Questions

-1
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0answers
13 views

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: ...
-1
votes
0answers
39 views

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?
-2
votes
0answers
9 views

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
-1
votes
0answers
11 views

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 ...
-2
votes
0answers
14 views

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 ...
0
votes
0answers
33 views

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....
-1
votes
0answers
6 views

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 ...
-1
votes
0answers
17 views

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 ...
3
votes
1answer
28 views

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 ...
0
votes
1answer
31 views

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 ...
0
votes
0answers
39 views

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" ...
-4
votes
0answers
17 views
0
votes
1answer
62 views

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!
-3
votes
0answers
13 views

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
-1
votes
0answers
42 views

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?
-1
votes
1answer
18 views

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 ...
1
vote
2answers
49 views

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 ...
-1
votes
0answers
12 views

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?
-1
votes
1answer
29 views

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 ...
-3
votes
0answers
17 views

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 ...
0
votes
0answers
24 views

Release of oxygen in reactions of PbO2 and Pb3O4? [on hold]

I have understood that roughly $\ce{Pb3O4}$ is equivalent to $\ce{2PbO.PbO2}$. I have the following reactions to study. Would someone please help me understand the mechanism? Both $\ce{PbO2}$ and $\...
4
votes
2answers
51 views

Heisenberg uncertainty principle and lifetime of the excited state

A key relation in optical spectroscopy also used to derive natural bandwidth is: $\Delta E \Delta t=ℏ$ $\Delta E$ is the energy uncertainty of a state, $\Delta t$ should be the uncertainty of the ...
1
vote
0answers
73 views

Are pi electrons in 1,3 cyclobutadiene delocalised? [duplicate]

The original question in my test was whether all bonds in the aforementioned molecule are of same length. According to the solution booklet, it is not because pi electrons are not delocalised due to ...
0
votes
0answers
10 views

Deodorants: are drying agents used, to help evaporation? [on hold]

I'm investigating types of ingredients used in deodorants. I'm sure one important action is increasing rate of evaporation of sweat. I'd like to know what some of these more commonly used chemicals ...
0
votes
0answers
30 views

Is the Belousov-Zhabotinsky reaction reversible/repeatable? [on hold]

And are there ratios of the ingredients to make it work? I'm currently looking for interesting chemistry experiments for my school open day, hence the formation of this post. If you have any other ...
-4
votes
0answers
19 views

Is the difference between two kelvin temperatures a celsius temperature? [on hold]

physical scales of temperature differences? physical temperature scales #
-1
votes
0answers
21 views

organic molecules with many functional groups [on hold]

I would like to hear some examples of the molecules that contain the many different functional groups, the most variety if possible
-1
votes
0answers
19 views

What types of molecules are these? [on hold]

I don't know the rules for figuring out of these molecules are amino acids, monosaccharides, steroids, etc etc etc. Please help :) https://imgur.com/gallery/6bEBsMD
4
votes
2answers
50 views

Which one has higher priority according to Cahn–Ingold–Prelog rules?

Which one has higher priority according to Cahn–Ingold–Prelog rules? (1) $\ce{-CH2OH}$ and $\ce{-CH=CH2}$ (2) $\ce{-CH2OH}$ and $\ce{-C(CH3)3}$ The answer says $\ce{-CH=CH2}$ has higher ...
-1
votes
0answers
15 views

Low blood viscosity and carbon monoxide poisoning [on hold]

Why do bodies with carbon monoxide poisoning exhibit low blood viscosity?
-4
votes
0answers
17 views

An infant drops their bowl of food on the floor. As the bowl is falling it possesses [on hold]

A) kinetic energy. B) potential energy. C) both kinetic and potential energy. D) neither kinetic nor potential energy.
-1
votes
0answers
13 views

Dying purple polyester dress to a lighter color with bleach [on hold]

I want to diy a purple dress made from 100% polyester to a lighter purple by using bleach. Using bleach on polyester fabric might not work and might weaken the fabric. What color will the purple dress ...
-2
votes
0answers
18 views

Please give me the solution [on hold]

Based on the data arrange 'fe2+,mn2+,cr2+ in the increasing order of stability of +oxidation state E° cr3+/cr2+=-0.4,E°mn3+/mn2+=+1.5,E°fe3+/fe2+=+0.8
1
vote
0answers
33 views

Why can't Cu + HCl -> CuCl2 + H2 happen? [on hold]

1)How can I tell if a reaction like Zn + Hcl -> ZnCl2 + H2 can happen or not? 2)How can I tell if a reaction forms a precipitate and how do I know where the arrow goes? Like 2 AgNO3 + K2CrO4 -> ...
-3
votes
0answers
24 views

are any thing else formed expect double bond while elimination the water of alchols? [on hold]

What is the mechanism of the elimination reaction of alcohols to remove water? Can anything else except double bond form?
-1
votes
0answers
15 views

Solubility of iron(II)hydroxide [on hold]

Solubility of iron(II)hydroxide is $K_s = 1.0 · 10⁻¹⁴ (mol / dm³) ³$. How I calculate solubility of $Fe(OH)_2$ in buffer solution which pH is 10.54. I know that $K_s = [Fe^{2+}][OH^{-}]^2$ and the $...
-3
votes
0answers
12 views

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
0
votes
0answers
12 views

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 ...
-1
votes
0answers
21 views

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 ...
4
votes
4answers
246 views

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 ...
-2
votes
0answers
23 views

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) $56200 \pm 100$
1
vote
2answers
47 views

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-...
-1
votes
0answers
30 views

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?
6
votes
1answer
701 views

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 $\ce{Be}$...
0
votes
0answers
49 views

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 ...
-1
votes
0answers
25 views

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 ...
1
vote
3answers
76 views

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 ...
1
vote
1answer
69 views

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 ...
0
votes
0answers
34 views

Heating Dry Benzenediazonium Chloride

If we heat BDC with water then phenol is formed. I was wondering what would happen if we heated dry benzenediazonium chloride. I know that on heating benzenediazonium fluoroborate we obtain ...
-4
votes
0answers
19 views

Rank the substances below from highest boiling point to lowest boiling point [on hold]

Need help all structure are similar so i am confused

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