All Questions

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IR fluorescent material for outdoor use

I am experimenting with IR video cameras. They have a broad sensitivity peak at 940 nm. There is a filter blocking 750 nm and shorter in front of the sensor. I am looking for an IR fluorescent ...
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I recently learned I'm allergic to potassium dicromate or chromium

are eye drops with inactive ingredients called potassium chloride or sodium chloride the same as potassium dichromate and should I stop using those eye drops?
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Can one figure out an optical absorption spectrum from EPR data?

I'm wondering if it's worthwhile for me as an optical spectroscopist to read up a bit on EPR. Do EPR signals reveal where, in terms of wavelength, features in the optical spectrum can be expected to ...
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Why does the quantum number n limit the value of l, and why does l, likewise, limit the value of m?

Any quantum number that represents the size of an orbital is a positive integer, $n$. Any quantum number that represents the shape of an orbital is a non-negative integer, $l : l < n$. Any ...
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When a carboxylic acid acts as a nucleoplile, why does it attack through the carbonyl bond?

Here's a couple of examples of what I mean. Firstly, in the reaction with thionyl chloride to make a carboxylic acid: Secondly, in this specific example of a hydroboration reaction: I don't ...
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How to distinguish open-pored polymer foam and foam with closed pores?

I was looking at two foam materials, where I had expected one to have closed pores. Unfourtunately, the microscope was showing the upper layer of cut cells the same in both cases with no indication ...
24 views

Finding a reaction from a set of compounds

Consider the following reaction: http://www.genome.jp/dbget-bin/www_bget?R00529 It is a reversible reaction with C00002 and C00059 forming one side of the reaction and C00013 and C00224 forming the ...
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Ether cleavage with conc HBr

Ive been asked to draw the mechanism by which benzene with $\ce{Me}$ on position 1 and $\ce{OMe}$ on position 2 goes to benzene with $\ce{Me}$ on 1 and $\ce{OH}$ on 2 by reaction with concentrated ...
26 views

In what sense is the Inductive effect a permanent effect?

Almost everywhere I checked, the Inductive effect is described as a permanent effect with almost no mention of what that actually means. What exactly is permanent about the effect? If the effect is ...
40 views

Photograph of Light as Wave and Particle

What is this? Actually its the first photo of light as wave and a particle The bottom "slice" of the image shows the particles, while the top image shows light as a wave. I have questions: How ...
22 views

Reaction of cyclic aldehydes with hydrazine and hydrogen peroxide

What is the product of this reaction, which I found in our high school textbook? Initially At first, I thought this was a typical Wolff-Kishner reduction, but then I saw the reagents didn't match up ...
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Why doesn't EDTA complex with alkali metal ions?

EDTA complexes with all the other metal ions in the periodic table except those from the group 1. Why is this so ? What is the coordination chemistry behind this ?
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The Health Effects of Alkaline Ionized Water?

I came across alkaline ionized water as my aunts bought a system called Kangen Water from Enagic Inc. The water produced by this system is claimed to contain smaller water clusters (4-6 molecules) ...
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How to find pH by mixing two solutions of different concentrations?

A mixture is made by combining 110 mL of 0.15 M $\ce{HCl}$ and 215 mL of 0.055 M $\ce{HI}$. What is the pH of the solution? $$\ce{HCl -> H+ + Cl-}$$ $$\ce{HI -> H+ + I-}$$ According to ...
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Are electron shells probability distributions?

I know that orbitals are probability distributions. Are electron shells probability distributions too?
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Quick and simple explanation of molar mass, molecular mass and atomic mass

As a physics student, I hardly deal with such quantities and when I do, I blunder through. I think it’s a good time to be given a good explanation for these since I’m in a class of Nuclear physics. I ...
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Is there a theoretically greatest atomic number? [duplicate]

Is there any law of nature/chemistry that would prevent an ideal chemist (i.e. one that knows everything about chemistry and that can synthesize any physically possible chemical element)from ...
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Finding the height of a column of Mercury with certain pressure and gravity [on hold]

A moon of Saturn has been estimated to be $146.7 kPa$ -one and a half times that of Earth. However the force of gravity is only 1.352 ms2. How high would a column of mercury be at the moon's ...
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Why isn't helium always He 1s?

Part 1: According to what I've learned so far, helium is in the first row of the periodic table, so its $n$ should always equal $1$. However, a question in my text asks about helium 2s. What is helium ...
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What is the theoretical and percent yield in sulfur trioxide based on the reaction of sulfur dioxide and oxygen? [on hold]

Consider the following reaction: $$\ce{2SO2(g) + O2(g)->2SO3(g)}$$ If $275.9~\mathrm{mL}$ of $\ce{SO2}$ is allowed to react with $167.6~\mathrm{mL}$ of $\ce{O2}$, both measured at ...
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Sugar dissolution test

Is there a way to detect whether sugar is completely dissolved in a cup of water other than looking at the bottom of the cup? I was wondering if there is a test or something that can be carried out ...