Chemistry Stack Exchange
Chemistry Stack Exchange

Questions tagged [erratum]

For questions that deal with possible errors in a specific statement of a specified book, article, website, etc. These questions should always include a complete reference (see tag wiki for format).

For questions that deal with possible errors in a specific statement of a specified book, article, website, etc. These questions should always include a complete reference in this specified format:

  • Author(s), Initial(s): Year of publication, Title, Edition, Publisher, Place of Publication. (ISBN, URL if available) Add page number, table/figure/scheme accordingly

  • Author(s), Initial(s), Journal name Year of publication Volume number (Issue or part number), first (and last page) numbers (Title, DOI, URL if available) Add page number (for longer publications e.g. reviews), table/ figure/ scheme accordingly

  • online resource with a permalink (e.g. Wikipedia) If the resource is fickle, consider sharing a Web Archived link instead.

117 questions
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Regioselectivity of acid-catalyzed ring-opening of epoxides

Not to be confused with what is the mechanism of acid-catalyzed ring opening of epoxides. What is the correct order of regioselectivity of acid-catalyzed ring-opening of epoxides: $3^\circ$ > $2^\circ$ > $1^\circ$ or $3^\circ$ > $1^\circ$ >…
Ben Norris
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votes
4 answers

How many Ga atoms are connected to one As atom in solid gallium arsenide?

In Boylestad and Nashelsky's Electronic Devices and Circuit Theory, the structure of GaAs is shown as follows: Arsenic is shown making five covalent bonds to neighbouring gallium atoms. However, I recently also saw an alternative depiction in…
user31782
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2 answers

What is the difference between molar conductance and molar conductivity?

I'm learning (or at least trying to learn) about electrochemistry, but a major obstacle to that, is that different books I refer use different terms for the same symbols. So in a last ditch attempt to clear stuff up, I've resorted to Chem.SE. So…
paracetamol
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14
votes
2 answers

Configuration of chiral center in cocaine

I couldn't get the absolute configuration for the chiral center I marked. I got R, but according to my answer key it is apparently S. Would really appreciate an explanation.
cynthia
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14
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1 answer

Definition of the B3LYP functional in common QC programs

I wanted to use custom functionals with Gaussian and came up with some interesting definitions of the B3LYP functional within Gaussian, Orca and Turbomole, ... $$\small\begin{array}{lcccccc} \hline & \text{Gaussian} & \text{ORCA} &…
pH13 - Yet another Philipp
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Is an ester or a ketone more acidic?

Two organic chemistry textbooks I've read (by Bruice and by Tandon) say: Esters are more acidic than ketones, because the resonance between the two oxygen atoms gives less opportunity for the delocalization of the electron pair on the alpha carbon…
Amogh
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10
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Are the tars in cannabis considerably more dangerous than those in tobacco?

The claim that "the tars in cannabis are considerably more dangerous than those in tobacco" is made in Patricks An Introduction to Medicinal Chemistry (4th edition, p. 169). It's just a simple one line statement and not much attention is given to…
Jori
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9
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Are all ionic compounds salts?

According to Wikipedia: A salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base. Are all ionic compounds salts? Are all salts ionic compounds?
zzzlkj
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9
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2 answers

Why can't I dry/concentrate ethanol using calcium chloride ... or can I?

My (very unreliable) school textbook tells me: Lower alcohols form a solid derivative with certain metal salts. and, It is for this reason that ethanol cannot be dried/concentrated using anhydrous calcium chloride. Nowhere else in the book, is…
paracetamol
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9
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1 answer

Planes of Symmetry and Chirality

I am trying to identify whether the following objects possess planes of symmetry or not, but my answers seem different, from the textbook solutions (Klein Organic Chemistry 2e, Page 220, Question 23). Some of them I am unsure of and would like to…
imaginov
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9
votes
2 answers

Orientation of external cell when voltage is supplied by it to voltaic cell so as to oppose its cell potential

Given below is a page from our Chemistry Textbook: As it can be seen, the direction of $E_{ext}$ in figure $3.2(c)$ is opposite to the direction in figures $3.2(a)$ and $3.2(b)$. I understand that $E_{ext}$ is supposed to oppose potential of the…
Alpha Delta
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8
votes
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Does aldol condensation give different products in different conditions?

I know the mechanism of aldol condensation and general method to determine products in crossed aldol reactions, or reactions between dissimilar molecules. But the following statement in my class notes baffles me: In presence of a base (alkaline…
stochastic13
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8
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2 answers

How to calculate the potential via Hess's law? Is my textbook wrong about this?

Given the two reduction half-reactions for the following fuel cell, determine the standard cell potential $E^\circ_\mathrm{cell}$, $$\ce{CH4 (g) + 2 O2 (g) + 2 OH- (aq) -> CO3^2- (aq) + 3 H2O}.$$ Reduction half-reactions: …
Klik
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7
votes
2 answers

Why is glycine hydrochloride more acidic than chloroacetic acid?

I cannot figure out why glycine hydrochloride is more acidic than chloroacetic acid. Could I have figured this out from a $\mathrm pK_\mathrm a$ table and maybe am just not seeing it? On the table I have in my book (Organic Chemistry, Seyhan Ege,…
John
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7
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3 answers

Are these reaction equations for the formation of the brown ring complex correct?

\begin{align} \ce{NO3- + 3Fe^2+ + 4H+ &-> NO + 3Fe^3+ + 2H2O}\tag{1}\\ \ce{[Fe(H2O)6]^2+ + NO &-> \underset{\text{(brown)}}{[Fe(H2O)5(NO)]^2+} + H2O}\tag{2} \end{align} The above are the reactions given in my book [1] for the qualitative analysis…
Rohinb97
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