# All Questions

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### How would you find the mass in grams, if you only know the number of particles of a portion of the formula?

If you were given a question like below: What is the mass in grams of a sample of Fe$_2$(SO$_4$)$_3$ that contains 3.59 × 10$^{23}$ sulfate ions, SO$_4^{2−}$ ? The molar mass of ...
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### What's the difference between a nucleophile and a base?

Obviously it depends on the context whether you would call a particular species a nucleophile or a base but are the two terms largely synonymous or is there a difference?
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### 7,7-dichlorobicyclo[4.1.0]heptane NMR solving

i made a synthesis of this material in the lab and now i got the H-NMR specta , and by litreture i know that i got the right product. im having trouble to match the hydrogens to the peaks,i tried to ...
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### Good book for foundational chemistry

I need a good book that explains the basics of chemistry in a lucid and importantly, systematic manner. Most books on this subject are not comprehensive and assume that the reader is well acquainted ...
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### Does inversion of configuration necessitate reversed optical rotation?

Say, optically pure 2-bromobutane undergoes Sn2 reaction with an alkali to form 2-butanol. The configuration about chiral carbon will now be inverted, but is it necessary that the sign of optical ...
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### Procedures in Experimental chemistry

An experiment was carried out involving α-Bromoheptaldehyde dimethyl acetal. The experimental details are given below. A solution of enol acetate (15.6 g, 17.7 mL) in chloroform (20 mL) was cooled ...
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### Is there a material that reduces copper melting point and completely dissolves?

Is there any material that you mix/alloy with copper that will result in something that behaves similar to plastic (that is at room temperature it is solid, at maybe 500K or similar it can be easily ...
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### Is hydrated calcium silicate a good anticaking agent?

I work in a salt production factory and I want to make a purchase for hydrated calcium silicate as an anticaking agent for salt. Is it a good anticaking agent for salt and what is the perfect ...
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### Why is nitration of veratrole specific in these positions?

Why do we not need $\ce{H2SO4}$ as acid catalyst for di-nitration of veratrole? Why does the 2nd nitro group go to positions 4 or 5, following the directing effects of the methoxy-group? Doesn't the ...
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### Is it relevant to pursue a master degree or a doctorate when applying to a job in the petroleum field? [on hold]

I have a few more questions of this type for an interview. ( University work ) Thanks in advance.
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### What is the difference between nuclear fission and nuclear fusion?

I always mix up the definition of nuclear fission and nuclear fusion. So, what is nuclear fission and nuclear fusion, and an example for each?
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### Is the refractive index of a solution of four substances is a median of the four subtances' refractive index?

I need to determine the purity of a solution and we need to discuss about the 'theoretical' refractive index of the substance that we are supposed to have. Thank you!
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### How many grams of water would you add to 1.00 kg of 1.44m CH3OH(aq) to reduce the molality to 1.00 m CH3OH?

How many grams of water would you add to 1.00 kg of 1.44m $\ce{CH3OH (aq)}$ to reduce the molality to 1.00 m $\ce{CH3OH}$? I am absolutely stuck on the last question of my mastering chemistry ...
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### Why do the d orbitals have these notations?

Why do the d orbitals have the following notations: $xy, yz, xz, z^2$ and $x^2-y^2$? What do they represent in their wave-functions?