# All Questions

29,056 questions
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### Can a double bond extend beyond the plane and if so, how would it be drawn?

Can double and triple bonds, etc., extend beyond the plane in a Lewis structure, and if so, how are they represented? I.e., how would 1 and 2 in this image be drawn if they were doubles or triples?
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### 2-step reaction mechanism for the decomposition of NO2Br

I need to propose a 2-step reaction mechanism for the following reaction: $$\ce{2NO2Br -> 2NO2 +Br}$$ And prove the mechanism is consistent with: $$v=k[\ce{NO2Br}]^2$$ For the mechanism to be ...
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### Transparent gel-like liquid that hardens quickly when in contact with air [on hold]

Is there any gel-like liquid that is transparent (preferably the same density as glass) but hardens quickly when in contact with air? I need it for a thing. The gel should harden as quickly as ...
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### Calcium Nitrate - Why only 18.8% Calcium for fertiliser?

I brought a kilo of Calcium Nitrate for my hydroponic setup. The chemical formula for Calium Nitrate is Ca(NO3)2. I did a quick calculation of its weight: Ca = 1*40.078 N = 2*14.006 = 28.012 O =...
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### Mechanism for the reaction of Cyclobutane-methenol with hot conc. H2SO4 (443K) [on hold]

In this reaction i expected dehydration due to H2SO4 by removing OH group and beta-H, but by doing so i am getting a wrong result. I suspect that 3° H is hard to remove there for instead, H on the ...
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### Why more negatively charged oxygen has lower electronegativity? [on hold]

I want to site my problem with an example: Alkali metal nitrites are ionic and hence the nitrite ion chiefly attacks through oxygen ie because oxygen has extra electron and hence negative charge ...
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### Are these calculations valid enough? [on hold]

I am not able to understand how these calculations are being done in this book. Up until this section, the book is going smoothly. However, how are these calculations accountable? If anyone can ...
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### How to dope a semiconductor? [on hold]

I would like to know what tecniques can be done to dope a semiconductor. Let's say you have a semiconductor such as Silicon. How do you dope it with another element ?
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### Does reduction/ oxidation take place separately at a half cell electrode?

In the redox reaction chapter, we learn that oxidation and reduction go hand in hand. The oxidising agent oxidises by accepting the electron released by the reducing agent and gets reduced in the ...
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### Rate of hydrolysis of ester in presence of an acidic medium

Does the rate of hydrolysis of an ester depend on the concentration of both the ester and the acid, or only the ester? I was told by my professor that hydrolysis of ester follows a pseudo-first order ...
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### Calcium Phosphate Bridges in Casein Micelles being dissolved using Ethanoic Acid

I am writing a chemistry essay about casein isolation using acid precipitation. I read that the casein micelle itself is constructed of more "mini" micelles, which are constructed of the constituents ...
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### Synthetic steps for the interconversion between aldehydes and ketones

I am learning about carbonyl chemistry at the moment. So far, we have been able to make aldehydes and ketones from alcohols (via oxidizing agents). I can't help but wonder if there is possibly any way ...
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### What happens when an ionic compound is boiled? [duplicate]

Do ionic compounds such as NaCl become individual ions such as one Na ion and one Cl ion or are they hold together by ionic bonds even when they are boiled. Thanks in advance.
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### Possible source for primaryy alcohol and priimary amine [on hold]

Is diphenylhydramine a possible source for ethanolamine if hydrolyzed? If so would yields be worth the effort?
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### What is the geometric shape for 6-gingerol? [on hold]

Listing for the geometric shape for each atom except: 1) hydrogen, or 2) any atoms with more than 4 charge clouds around it (think VSEPR). Make sure you clearly identify each atom when you refer to it....
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### Interpretation of mass spectra: consecutive neutral loss of two 18

Below is the structure my tentatively identified compound. It was found at m/z 293.114 at negative ion mode. In addition, I found two m/z peaks, which are due to the consecutive neutral loss of two ...
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### What defines a proton as “labile” in NMR? [on hold]

What makes some protons labile and others not? For example the OH and NH2 protons get exchanged but CH ones don't. When we use the D2O test, we say the labile protons get exchanged for D so their ...
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### Cyclic compound reactions [on hold]

I don’t get it why doesn’t C=C in cyclic compound undergoes electrophilic addition like in Alkene?! The amine group in cyclic compound doesn’t react with acyl chloride why?
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### Does silver oxide react with hydrogen sulfide?

Electronic connectors are often silver plated. However, silver tarnishes fairly quickly and heavily. There exists a widespread misconception that the tarnishing of silver contacts is harmless, because ...
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### Mass percentage prblem from chang chemestry book [on hold]

I need help with a exercise from Raymond Chag chemistry book (11th edition): If for each $\ce{N}$ atom from $\ce{C3H5N3O9}$ (Nitroglycerin) forms one $\ce{NO}$ (nitric oxid) what is the percentage ...
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### Clevage of ethers by a hydrogen iodide [on hold]

By what mechanism does the clevage of benzylic ethers take place in presence of HI SN1 or SN2 Please explain This confusion has been haunting me for too long (This is not a home work question. I had ...
18 views

### Osazone formation by monosaccharides [on hold]

Which of the following can give same osazone with excess phenylhydrazine Glucose, Fructose, Galactose, Mannose. Please explain with proper mechanisms.
25 views

### how to find final temperature [on hold]

One mole of an ideal monoatomic gas initially at a temperature t1 , pressure p1 and volume v1 in a thermally insulated cylinder closed at one end fitted with a movable piston at the other end is ...
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### Ionisation of a gas - from gas to plasma

Is it possible to ionise a gas such as Carbon Dioxide? If you continue to heat up a gas eventually the electrons from the gaseous atoms are stripped away and those e- gain energy (endothermic reaction)...
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### How will the equilibrium concentration change on adding inert gas at constant pressure? [duplicate]

The given reaction is $$\ce{AB2(s) → A(g) + B2(g)}$$ Now on adding inert gas at constant pressure equilibrium should shift on direction of more gaseous moles. But the answer says that equilibrium ...
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### Is (n1/v1) = (n2/v2) a valid interpretation of Avogadro's Law? [on hold]

I learned the formula for Avogadro's Law as (V1/n1) = (V2/n2) And it's one I've always used due to 22.4 L/mol conversion factor. But in the Wikipedia article and several other places, I've seen ...
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### How to obtain spectroscopic constants Omega_e, Alpha_e, B_e, D_e and D_0 from centrifugal constants?

I need to compute a spectroscopic constants of $N_2^+$ states and I would like to do it using LEVEL16 software, due to its high interpolation flexibility. But it seems, that LEVEL16 can only compute ...
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### Is there an absorption rate for items?

I'm wondering if there is a word for describing the limit of how much an item can absorb water. Like if the absorption rate (my words) for a towel would be 20 and the absorption rate for toilet paper ...
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### Which is more stable in gas phase, free radicals or ions?

Answering some kinetics questions I came across this statement: Free radicals are more stable in the gas phase than ions. Is this correct or not? Why? Is there a different trend in liquid or ...
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### Grignard reagent and acidic hydrogen

Why does the Grignard reagent not react as a base in case of ketones even though the α-hydrogen atom in case of ketones is acidic? Grignard reagents do react with ethyne to give hydrocarbons, so why ...
30 views

### Can static electricity damage solar cells?

How does static electricity damage common solar cells making them less photo reactive? At watt voltage and/or amps would change the chemistry of the common solar cell? I want to think that as long ...
43 views

### How do I create Colloidal Lithium? [closed]

Hi I would like to know how to Create colloidal Lithium. I am grateful for any help. Thank you a lot
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### Potassium hydroxide solution in ethyl alcohol [on hold]

I'm following an extraction which calls for 3.5 milliliters of a 10% potassium hydroxide solution in 95% ethyl alcohol. The wording of this confuses me. Am I using 3.5 milliliters of the alcohol to ...
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### Cold Trap for Solid Phase Peptide Synthesis [on hold]

I've recently started my research on solid phase peptide synthesis and I'm in charge of setting up the instruments for the process. When washing my resin beads with DCM and DMF, I'm going to drain the ...
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### What causes signals from the solvent DMSO to appear in proton NMR spectra? [closed]

What is the reason behind signals appearing in proton NMR spectra of deuterated DMSO solvent in any organic product?
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### Calculating the percentage purity of CaCO$_3$ in a sample of chalk [closed]

$\pu{1.5 g}$ of chalk were treated with $\pu{10 mL}$ of $\pu{4 N} \; \ce{HCl}$. The chalk was dissolved and the solution made to $\pu{100 mL}$. $\pu{25 mL}$ of this solution required $\pu{18.75mL}$ ...
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### How to write electronic configuration of p-orbitals?

For example, the electronic configuration for the element boron can be writen as: 1s2 2s2 2p1 However, it is can be written more accurately by taking the different p-orbitals into account: The ...
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### Questions in Equilibrium [closed]

I have two inquiries concerning equilibrium: Does $K_c = 5.0$ indicate that the equilibrium mixture contains both products and reactants at an approximately equal amount? I know that $K_c \approx 1.0$...