# All Questions

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### Why dosen't$\ce {H-O-O-O-O-O-O-O-O-H}$exist?

The question has its roots in why only carbon mainly shows catenation. I don't see why such a compound cannot be formed. Why don't we have a whole branch dealing with such compounds other than Organic ...
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### There's a ghost in my whiteboard?

...or at least I thought so, when I saw that the ink that was on my whiteboard last night became really messed up the next day. The image below shows my whiteboard before (on the left) and after (on ...
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### Why does the activation enthalpy of ester hydrolysis increase with an increase in alcohol-chain length?

(Particularly concerning acid hydrolysis) Is there some sort of chemical reason as to why with increasing alcohol-chain length, there is also an increase in the minimum energy needed to cause the ...
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### Fluoride Solubility in Autoclave Water

if an autoclave contains a component which has remnants of fluoride ions after an acid wash, what temperature/pressure of autoclave would be best to flush out the remnants and ensure the component ...
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### decomposition of h2o2

According to the decomposition of 3% hydrogen peroxide, if 2cm^3 of h2o2 is used, then 3 x 10^-5 mol of 02 should be produced. However, we needed to find the theoretical yield so we conducted an ...
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### Calculate the molarity of the solution? [on hold]

An aqueous solution x contains 20% x by mass. If the density of the acid is 1.25g/cm3. Calculate the molarity of the solution?
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### what happens when sweat reacts with copper and aluminium

I am doing an experiment hand battery.. If we keep our hands on 2metal plates and connect both of them to a multimeter..it shows some current flow due to reactions happening between sweat and metal ...
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### Low melting point of Manganeese

Melting point of manganese is lower than that of other 3d series except copper and zinc. Melting point increases from scandium to chromium. The reason given in my book for this trend is the increase ...
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### Alternative to a proton [on hold]

I know I might sound terribly stupid but the idea just hit me. We define elements on the periodic table as "lumps" of matter with specific amount of specific particles (electrons neutrons and protons) ...
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### Is C60 a ionophore?

I don't quite understand what qualifies as an ionophore but lipid solubility and ion transporter/carrier are two of C60's hallmark features, no? Thus does this make it an ionophore? I can't seem to ...
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### How does an air conditioner produce liquid [on hold]

I always notice that when an air condition is working and cooling the room it, is heating outside the room and a Liquid is dropping from the other side of the air conditioner. how does this happen and ...
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### How to calculate the volume of oxygen in a reaction between hydrogen peroxide and bleach using this apparatus

I know that the reaction between bleach and hydrogen peroxide produces oxygen but using this apparatus and information I need to state how to calculate the volume of oxygen released. From my initial ...
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### Volume of sucrose (solute) contributing to volume of solution? (solvent = water)

I'm trying to make stock solution of 3M sucrose in water. In 25ml, this is 25.672g sucrose (FW 342.3). However, that mass of sucrose, in the powder, occupies a pretty substantial volume, such that ...
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### Kinetic Isotopic Effect in EAS

It is observed that rate of reaction of two isotopologues of benzene, $\cf{C6D6}$ and $\cf{C6H6}$, is the same for electrophilic aromatic reactions, as the deprotonation is not the rate limiting step. ...
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### Carbon dioxide capture in a Metal-Organic Framework

We have been learning about the adsorption processes: chemisorption and physisorption. What would the reaction mechanism for the chemisorption of carbon dioxide onto a CD-MOF (cyclodextrin ...
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### Liquifying metal and toxic fume exposure

I just read a very entertaining Youtube comment thread on a video where TheBackyardScientist melts tin on the stove in his (enclosed) kitchen, the proceeds to cook a steak on it. According to the ...
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### How to remove salt from powdered soup mix?

Sometimes I carry powdered soup mix (Knorr/Maggi) when I travel but they are way too salty. Is there an efficient and simple chemical process to lower the salt content? I know sodium is super soluble ...
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### Hydroxide storage

I am figuring out what chemicals to store with Ammonium hydroxide. At the moment a 2-shelf corrosive resistant fume hood cabinet will be used. I have in mind storing the Ammonium hydroxide with ...
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### Hydrogenation of alkynes to trans alkenes

Hydrogenation of alkynes in presence of lindlar's catalyst yields only cis isomer of the alkene formed.however if we break the catalyst into fine pieces and then make use of it under adequate pressure ...
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### What is the mechanism of reduction by Li AlH4? [on hold]

What is the mechanism of reduction by LiAlH4 ? I get particularly confused by this hence wanted the reaction mechanism .
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### What exactly is alcoholic KOH and how is it different from aqueous KOH ? [duplicate]

What exactly is alcoholic KOH and how is it different from aqueous KOH ? Why is one of them considered a Strong base in organic chemistry while another is considered relatively moderate .
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### Is water “hardness” dependent more on calcium or magnesium?

If one sample of water has a certain concentration (g/L) of calcium ions, and another sample as that same concentration of magnesium ions, will one solution have a greater "hardness than the other"? ...
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### Why strong bases like NaNH2 are only stabilised by H+ ions while the relatively moderate bases like aq KOH get stabilized by any positive charge

Why strong bases like NaNH2 are only stabilized by H+ ions while the relatively moderate bases like aq KOH get stabilized by any positive charge. Particularly in organic chemistry it is observed that ...
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### What effect does the nitro group have on the binding of an azo dye to cotton? [on hold]

I was wondering if NO2 would increase or decrease the retention of dyes and how. What effect does the nitro group have on the binding of an azo dye to cotton?
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### Raoult's Law and Mole Fraction

Raoult's Law states that the partial vapor pressure of each component of an ideal mixture of liquids is equal to the vapor pressure of the pure component multiplied by its mole fraction in the ...
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### How to pronounce “NONOate”? [on hold]

for nitric oxide release... one of the most investigated NO donor is N-diazeniumdiolate. but N-diazeniumdiolate call "NONOate". I wanna know.... How to pronounce this nickname? NONOate [en o ...
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### Why isn't Graham's Law working here?

In graham's law of diffusion most numericals I have seen assumes the formula $$\frac{r_1}{r_2}=\frac{P_1}{P_2}\sqrt{ \frac {M_2}{M_1}}$$ Where they say $P_1,P_2$ are the partial pressures of the ...
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### calculate volume change on solid-gas phase change? [on hold]

Is this volume change calculated chemically or physically, as the chemical constituents don't change. Yet they might, in the case of a dissociating compound, say, the non-stoichiometric methane ...
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### Hybridisation of hexaamminecobalt(III) complex

Does $\ce{[Cr(NH3)6]^3+}$ have $sp^3d^2$ or $d^2sp^3$ hybridisation? Oxidation state of $\ce{Cr}$ is $+3$. The electronic configuration is $3d^3$ and the $d$ electrons occupy $t_{2g}$ orbitals. If ...
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### Experiment to verify Doxycycline is authentic [on hold]

I bought some questionable looking Doxycycline abroad, and I'm wondering if there is a experiment one could perform to verify the pills actually contain the aforementioned chemical. I'm not looking ...
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### DNA ligase activity [on hold]

During DNA ligase activity, an AMP binds to 5'P by which bond and to which atom and how much energy is released during its hydrolysis? Is this energy equivalent to that of released by hydrolysis of 2 ...
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### the longevity of amorphous metal

I have been recently introduced to this new concept of amorphous solids, in particular, amorphous metals, and I came up with the following problems that could not be answered with my somewhat ...
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### How can I convert and solve this problem? [on hold]

Given: 123 g of 1.6 % NaNO3 solution by mass Answer is in grams NaNO3
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### How do partially protonated sulfate ligands affect a metal's charge?

I'm currently reviewing the Periana-Catalytica system and I have a question about one of the intermediates, namely $\ce{[(bpym)Pt(OSO3H)2]^+}$, which is found in the following tutorial review. How do ...
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### What is first order reaction rate? [on hold]

Molecular iodine, $\ce{I2(g)}$, dissociates into iodine atoms at $625\ \mathrm{K}$ with a first-order rate constant of $0.271\ \mathrm{s^{-1}}$? What is the half-life for this reaction? (in s) ...
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### What is insoluble in drinking alcohol, but edible?

What substances are edible for human consumption, but will not mix with alcohol? What is a substance that would block alcohol from mixing with its counterparts in a product? For example: You make a ...
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### exam question about real pH of pure water [on hold]

as in the exam: which of these fact apply for water all the time $\ce{[OH^{−}]=[H+]}$ $\ce[H^+]} = 10^{-7}$ $\ce{[OH^{-}]} = 10^{-7}$ pH = 7 thank you!
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### Aromaticity & delocalization of electrons

Are these Anti aromatic/aromatic or non aromatic? 1. Here, if we were to consider the resonating structure(s) with charge separation One ring is aromatic and other is anti aromatic, and ...
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### Are there IP limitations on (M)SDS documents?

Much effort is put in putting together (M)SDS documents: Many companies offer the service of collecting, or writing and revising, data sheets to ensure they are up to date and available for ...
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### Which acid to choose when designing a world with acid seas? [on hold]

I'm currently writing a narrative and hoping to include a world which is home to a sea of some form of 'nasty' substance (doesn't have to be acid). The varieties of inhabitants of this world have ...
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### How do I figure out the amount of water (mL) and amount of Aluminum (g)?

We have a project where we have to extract copper from copper sulfate. But my group is given a powder version ($5~\mathrm{g}$), so we have to first dilute it with water and then combine it with ...
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### concentration of acid [on hold]

How do I find the molarity of a solution of potassium hydroxide containing $0.56~\mathrm{g/l}$? If it requires an average of $32~\mathrm{cm^3}$ of ethanoic acid to neutralise $25~\mathrm{cm^3}$ of ...
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### Non-Ideal Gas Behavior

I obtained measurements of temperature and pressure at various temperatures ($-10, 0, 20, \text{ and } 50^\circ \mathrm{C}$) and plotted them on a graph. Projecting backwards, the best-fit line ...
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### Is there a material that turns from being electrically conductive to non-conductive irreversably upon exposure to some form of radiation?

For my project I am looking for a material which can turn from being electrically conductive to nonconductive (has to be irreversible) upon exposure to electromagnetic radiation (say UV). I tried ...
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### Fractional distillation of a product differs from the components listed in the SDS. What am I doing wrong?

I recently bought a product called Prestone De-Icer for Windows and Wipers which claimed to contain Methanol. I was puzzled when using it to note that it did not smell much like Methanol so I looked ...
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### Is liquid “air” flammable? [duplicate]

I was wondering if liquid "air" (nitrogen, oxygen, and argon mixture) was flammable. Imagine you have a container. This container contains liquid air. The air is in liquid form, and is in direct ...
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### Reduction of a nitro compound to amine [on hold]

How to hidrogenate the nitro group in (2-Nitropropyl)benzene (2-Nitro-1-phenylpropane) yielding amino group? I need a balanced equation and conditions + catalysts... A similar (only non-saturated in ...