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).

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39 views

Why is degree of dissociation used to estimate strength of an acid?

Problem Which of the following will give strength of acid? A) pH B) Normality C) Degree of dissociation D) Dissociation constant Answer Question If pH is not considered as a metric to assess the ...
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Calculating atomic mass of unknown element in given compound (gas) at STP

A gas $\ce{X2O5}$ has the density of $\pu{5 g L-1}$ at STP. What is the atomic mass of $\ce{X}$ given $A_\mathrm{r}(\ce{O}) = 16?$ Note: The problem is my homework for school and has been translated ...
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Michaelis–Menten kinetics applied to a solution with two enzymes

Two enzymes are added to a solution containing a tow concentration of a substrate that they can both use. Which statement is correct? A. Both enzymes will use equal amounts of the substrate. B. ...
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Direction of external cell when voltage is supplied by it to Daniel cell to oppose cell potential

The above diagram is from our textbook for a Daniel cell. This is a diagram from our textbook showing a Daniel cell when an external voltage opposing the cell potential is a applied. Here ${E}_{ext}$ ...
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What is the correct formula for iodonium ion?

Previously, I have made a comment on user @Maurice's response to a question where he enquired about the existence of $\ce{I3+}$. I cited a paper1 which said that $\ce{I3+}$ is (apparently?) called ...
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Is there a mistake in diagramatic representation of RS perturbation theory described in Szabo and Ostlund textbook?

I'm trying to understand rules of the diagrammatic representation of the many body perturbation theory that described in Szabo and Ostlund "Modern Quantum Chemistry" textbook. One of the ...
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1answer
422 views

MolView is unable to generate correct 3D structure for hydroxypropadiene

MolView is unable to generate the correct structure of hydroxypropadiene. It instead generates the structure of acrolein (which has the same molecular formula). Why is this so? Is it because ...
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664 views

Boiling point of oxygen

I am studying chemistry from the book titled "Fundamental Chemistry for Cambridge O Level" written by Rosemarie Gallagher and Paul Ingram. On page 17, it states that oxygen boils at −219 °C and ...
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413 views

How can iodine oxidise hydrogen peroxide?

The following is mentioned in NCERT (government textbook in India used in all schools) under chemical properties of $\ce{H2O2}:$ (iv) Reducing action in basic medium $$\ce{I2 + H2O2 + 2 OH- -> 2 I-...
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Does it sometimes take energy to create a chemical bond? [duplicate]

Wikipedia says so: Bonds can also be broken apart. Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be ...
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Barron states that 4.18×10⁸ joules equal 1 kcal, is this correct?

Here is a paragraph in Barron's SAT chemistry prep book: Work itself is measured in Joules, and so is energy. In some problems, however, energy may be expressed in kilocalories. The relationship ...
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Is there a error at page 566 of Atkins Physical Chemistry? [closed]

At page 556 I found this question being analyzed and the rate law is provided. However, when I apply steady state approximation, I can't find the result without the factor 2. Is it me being wrong?
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Possible erratum in solutions to Orbital Interactions in Chemistry 2ed [closed]

I was attempting the problems in Chapter 1 of Orbital Interactions in Chemistry, and found a slight problem. ftp://ftp.wiley.com/public/sci_tech_med/orbital_interactions_2e/Chapter%201%20-%20Answers....
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Is it possible to obtain n-butane by treating halopropane grignard reagent with methanol?

The answer is a,b. My mechanism however doesn't give n-butane when R is propyl. Is this a case of textbook errata? Himanshu Pandey, Advanced Problems In Organic Chemistry, 9th edition ...
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Attack of 3-methylbutan-1-ol on benzene in acidic medium

That's how I proceeded with the question. However the answer is tert-butylbenzene. I can't figure out why do I have an extra carbon atom. SOURCE - JEE Advanced 1994
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What is the product of the following series of reactions?

. The answer given to this question is . This is how I attempted solving the problem. Considering that my answer and the author's answer is differing only by a methyl group, is this a publishing ...
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Pressure in Skoog Instrumental Analysis Problem 27-22b (gas chromatography)

Problem 27-22b in: Skoog; Holler; Crouch. Principles of Instrumental Analysis. Thomson Brooks/Cole (publisher varies by country) asks for corrected retention volumes. A compressibility factor, $j$ ...
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139 views

Is there a case when an atom of some element (e.g. carbon) does not have its expected number of protons (e.g. 6)?

Page 12 of the Study Guide for Campbell Biology, 11th Edition has the following question: A carbon atom has 6 neutrons. How many protons are present in the nucleus of a carbon atom? A. 12 ...
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103 views

thermochemistry problem confusion

I can understand upto where the ideal gas equation is used to calculate volume of steam. But on trying to find out $ \Delta V$ , i saw that there are no gases on the reactant side so then $P\Delta V=(\...
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Find the Electronic Configuration of an Iron Atom [closed]

I'm confused. Iron has 26 electrons and I wrote down $\ce{1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^6}$ yet my answer booklet says $\ce{1s^2, 2s^2, 2p^6, 3s^2, 3p^6}$ but that is only 18. How can it be ...
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1answer
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Classification of the Inside of a Grapefruit

In the text Chemistry: The Central Science, the inside of a grapefruit is classified as a homogeneous mixture. Unless I’m missing something, to me it would be a heterogenous mixture owing to pulp, ...
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Why is the carbon atom omitted from the molecular formula?

In my chemistry textbook, the following reaction was given: I have two questions related to the marked in orange boxes/parts of the image: Why is the molecule symbolized by $\ce{(CH3)3Cl}$ instead ...
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999 views

What is the expected product in the reaction of hydrogen chloride with allylbenzene?

Shouldn't it be 4th option since since the carbon attached to the ring is secondary as well as resonance stabilized?
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181 views

Steric hindrance during Hydroboration

In response to this diagram (Organic Chemistry By David Klein 3rd Edition Page 364): The textbook stated A comparison of the transition states for hydroboration via Markovnikov addition or anti-...
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108 views

Does S use its p-orbitals for bonding? [duplicate]

This question was inspired from the following questioN: I thought the answer would be either A (maybe accounting for larger sizes?) or B (Bent's rule) but apparently the answer is D. Can someone ...
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127 views

Same set of carboxylate reagents yielding two different products with an alkylide

I recently came across two contrasting products for the same set of reagents - carboxylic acid and alkyllithium, and wish to understand why exactly any difference exists between the two. Reaction 1 ...
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How can the outermost electrons in silicon be 2s and 2p electrons?

My book says the number of outermost electrons in silicon is $4$. Yes, right. But then it says those are $\ce{2s}$ and $\ce{2p}$ electrons. The electronic configuration of silicon is $\ce{1s^2 2s^2 ...
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Why are 3 equivalents of organolithium needed in synthesis of ketone from carboxylic acid?

For the reaction of a carboxylic acid and organolithium reagents to synthesise a ketone, Clayden's, on p 219, mentions: Notice that three equivalents of organolithium are needed in this reaction: ...
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102 views

How can a methyl halide react by intramolecular SN2?

Out of the following, $\ce{CH3Br}$ doesn't react by which mechanism? SN2 SN1 E2 Intramolecular SN2 E1 My textbook gives 2, 3 and 5 as the correct answers, which means it does react ...
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Is it a “Bary center” or a “Bari center”?

(Studying Coordination Chemistry, "Crystal Field Theory" at school) Apparently, different sources spell this differently. The Wikipedia article on Crystal Field Stabilization Energy, calls it the "...
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“Nitrogen (gas) is physisorbed over iron (metal) at room temperature”: Is this for real? [closed]

My copy (PDF) of Levine's Physical Chemistry (6th ed.), page 570-571, section: "Adsorption of Gases on Solids", states: Physical adsorption is nonspecific. For example, $\ce{N2}$ will be physically ...
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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?
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190 views

Where does the additional hydrogen in the Fischer depictions of glucopyranose come from?

My book shows this figure of Fischer formula of D-glucose: I don't understand this figure, and I wonder why the upper carbon atoms in both the right and left formulas have 5 bonds. And from where ...
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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 ...
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454 views

Can a bond be electrophilic or nucleophilic?

The indicated bond is: A) Nucleophilic because it is electron-deficient. B) Electrophilic because it is electron-rich. C) Nucleophilic because it is electron-rich. D) Electrophilic because it is ...
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265 views

Chemical Kinetics / Rate Question — Error in Textbook Question/Answer?

I am reading Kaplan's General Chemistry MCAT Review 2018-2019, and think that one of its chemical kinetic questions is wrong. (Or perhaps I am simply missing something). I have attached an image of ...
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The “Ostwald Isolation Method”: How does this work?

Recently started reading up on Chemical Kinetics, and I came across a certain "Ostwald Isolation Method" that figures in my school-issued workbook. Apparently, it's used to determine (...
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Does the rate of dissociation of PCl5 increase in presence of Cl2

I'm sorry if this is somehow inappropriate to ask but I've found a rather strange question on my text book that asks "Why does the rate of dissociation of $\ce{PCl5}$ increase in the presence of $\ce{...
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321 views

Is a SR2+ substituent really more electron-withdrawing than NH3+?

As the electronegativity of nitrogen and sulfur are around 3.04 and 2.58, respectively (according to the Pauling scale). So according to that, $\ce{NH3+}$ should pull the electrons more towards it ...
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What exactly does the “per mole” unit of heat of atomization mean?

I am facing a confusion in the definition of the standard enthalpy of atomization. The confusion arises because of the "per mole" in its units ($\pu{kJ mol^-1}$). My question: When I say "per mole", ...
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405 views

Can final volume differ from initial volume in a constant volume process?

A sample of 1.00 mol perfect gas molecules with $C_{p,\mathrm m} = 7R/2$ is put through the following cycle: (a) constant-volume heating to twice its initial volume, ... (Problem 2.5, Atkins Physical ...
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Does fumaric acid form stronger hydrogen bonds than maleic acid?

My book claims: Fumaric acid can form intermolecular hydrogen bonds (strong) while maleic acid forms intramolecular hydrogen bonds (weak), hence fumaric acid has higher boiling point than maleic ...
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Can a first degree carbocation form if a methyl shift is possible?

I was going through a reference book when I stumbled upon this question Is that even possible?
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Enantioexcess for a non-chiral molecule?

I am trying to understand this quote in a section on "Biotransformations of Organic Molecules" from a handbook I am reading: [...] Euglena gracilis could convert acetophenone to 2-...
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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.
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384 views

Bohr Radius Confusion

I saw online that the radius for each level is defined by the formula: $$r_n=n^2 r_1$$ Where $r_1$ is approximately $53\ \mathrm{pm}$. However, on the Barron's AP chemistry book 7th edition, it ...
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Can a table salt + vinegar mixture be explosive?

I remember having read in a book, Ask Me Anything (Dorling Kindersley), that a combination of copious amounts of table salt and vinegar is explosive. Now this was a really long while back, and I can'...
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2answers
7k views

What happens when prop-2-en-1-ol reacts with concentrated hydrogen bromide

What happens when prop-2-en-1-ol (allyl alcohol) reacts with concentrated hydrogen bromide? My Idea: I thought that in the first step protonation of the hydroxyl group will take place followed by ...
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883 views

Problems with Daniell cell

In Zemansky and Dittman's book on thermodynamics, pages 41–43, the authors discuss the Daniell cell as a thermodynamic system. Their cell consists of two saturated $\ce{CuSO4}$ and $\ce{ZnSO4}$ ...
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What is the simplest formula for the mineral beryl which contains 5.03% Be, 10.4% Al, 35.5% Si and 53.58% O?

Beryl is a mineral which contains 5.03% $\ce{Be}$, 10.4% $\ce{Al}$, 35.5% $\ce{Si}$ and 53.58% $\ce{O}$. What is the simplest formula for beryl? So I tried to follow a 3 step rule to solving this ...