All Questions
Tagged with textbook-erratum or erratum
119 questions
0
votes
0
answers
457
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 ...
user31607
4
votes
2
answers
15k
views
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 ...
- 51
3
votes
1
answer
852
views
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?
- 171
6
votes
1
answer
149
views
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-...
- 1,638
14
votes
2
answers
6k
views
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.
- 149
0
votes
1
answer
437
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 ...
- 1
2
votes
1
answer
8k
views
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'...
- 18.8k
2
votes
2
answers
11k
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 ...
3
votes
0
answers
1k
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 $\ce{ZnSO4}$ ...
- 159
3
votes
1
answer
3k
views
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 ...
3
votes
2
answers
5k
views
What exactly does κ stand for in this equation connecting solubility and molar conductivity?
I came across the following equation while studying electrochemistry ("Physical Chemistry" by Wallwork and Grant):
The solubility $s$ of a sparingly soluble salt can be determined from conductivity ...
- 18.8k
5
votes
2
answers
19k
views
Correct equation for Ionic Conductivity (λ) in Solutions?
We haven't started on Electrochemistry at school yet, but I did manage to find some time to read up on the topic. One thing I've noticed from when I started, is that different books and sites use ...
- 18.8k
19
votes
2
answers
37k
views
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 ...
- 18.8k
5
votes
1
answer
1k
views
Is Nitroglycerine a Nitro Compound or an Ester?
I looked up nitroglycerine in a science dictionary (Oxford Dictionary of Science, 2003), and it explicitly mentions that nitroglycerine is an ester and not a nitro compound.
However my teacher told ...
- 18.8k
3
votes
0
answers
104
views
Spectrochemical Series - Latest version?
--Studying the Crystal Field Theory [under Coordination Chem.] at school now--
A book my teacher lent me [printed in 2002] has the spectrochemical series in it, and it depicts pyridine [py] as having ...
- 18.8k
3
votes
1
answer
4k
views
Why is the solubility of sodium acetate trihydrate so much lower than anhydrous sodium acetate?
According to Wikipedia:
Solubility of anhydrous sodium acetate in water at 0 $^{\circ}$C is 119 g/100 mL (AKA 1.495 mol/100mL)
Solubility of trihydrate sodium acetate in water at 0 $^{\circ}$C is 36....
- 1,782
4
votes
1
answer
609
views
Clarification about Frost diagram y-axis conventions?
I was looking at the Frost diagram of Manganese, and on the UC Davis ChemWiki, I see this one:
However, the one straight from my textbook, "Descriptive Inorganic Chemistry" (Overton), looks like this:...
- 503
3
votes
1
answer
3k
views
Does the addition of water to N2H4 produce N2H4
I am currently calculating the $\ce{pH}$ of a species.
The reaction is as follows,
$$\ce{N2H4 + H2O <=> N2H_{$A$}+ + OH-}$$
However, I'm not sure what the value of $A$ will be. In my ...
- 31
6
votes
1
answer
740
views
Is these a pair of diastereomer or identical compound?
I attempted on this question (e) and found out that they are diastereomers, but the answer from the book is that they are identical. I worked out the configuration at each of the centres for the ...
- 381
6
votes
3
answers
16k
views
kJ per mole or kJ per 2 moles?
From Chemguide:
Here is a simple reaction between hydrogen and oxygen to make water:
$$\ce{2 H2(g) + O2(g) -> 2 H2O(l)} \quad \Delta_\mathrm{r}H^\circ = \pu{572 kJ mol^-1}$$
First, notice that ...
- 3,292
6
votes
2
answers
438
views
Error in formula for the solution to a chemical problem
The problem in my textbook goes like this:
Burning $0.68\ \mathrm{g}$ of an unknown substance, we obtained $1.28\ \mathrm{g}$ of sulfur oxide (IV) and $0.36\ \mathrm{g}$ of water. Find the chemical ...
- 3,292
6
votes
1
answer
48k
views
How to identify a redox reaction?
Which balanced equation represents a redox reaction?
\begin{align}
&\mathrm{A.} &\ce{AgNO3 + NaCl &-> AgCl + NaNO3} \\
&\mathrm{B.} &\ce{BaCl2 + K2CO3 &-> BaCO3 + 2KCl} ...
- 79
-1
votes
2
answers
7k
views
How many significant numbers(figures) are in repeating decimal (105-32)×5/9=40.5555...? [closed]
Source: Basic Chemistry, Steven S. Zumdahl, Donald J. DeCoste
Referring to the above, rule it seems $(105-32)\times\frac{5}{9}=40.5555\ldots$ has infinitely many significant figures. Am I correct?
- 115
6
votes
2
answers
2k
views
Factors affecting mass of a gas-evolving reaction mixture over time
Excess magnesium was added to a beaker of aqueous hydrochloric acid on a balance. A graph of the mass of the beaker and contents was plotted against time (line 1).
What change in the experiment could ...
0
votes
2
answers
3k
views
Volume change inside a balloon upon decreasing the the outer pressure
A balloon is filled with hydrogen at room temperature. It will burst
if pressure exceeds 0.2 bar. If at 1 bar pressure the gas occupies
2.27 L volume, upto what volume can the balloon be expanded?
...
- 197
3
votes
1
answer
6k
views
Calculating equilibrium partial pressures of a gas given Kp
My work:
${K_p = 28.4 = \frac{[NOBr]^2}{[NO]^2[Br_2]}=\frac{[NOBr]^2}{[107]^2[160]}} \rightarrow$$\ce{[NOBr]=7212 torr}$.
This doesn't match up with the given answer. I don't see why 262 torr is the ...
- 19.2k
3
votes
2
answers
474
views
How to name the tautomers of hexane-2,4-dione correctly according to IUPAC rules?
Today I was considering to answer the question "Which tautomer of hexane-2,4-dione is more stable?" I wanted to run a few calculations and while preparing a directory structure I wanted to make sure ...
- 44.4k
2
votes
0
answers
2k
views
Are these two structures of 1,3-dichlorocyclobutane enantiomers?
According to me they are not enantiomers because the mirror image can be rotated by $180^\circ$ to get the same compound.
Giving it a little more 3-D look:
But the book says they are enantiomers. I ...
- 2,391
6
votes
1
answer
3k
views
Constructing a Walsh diagram of AH2
According to Wikipedia, for the $\ce{AH2}$ Walsh diagram:
and the Walsh diagram in Shriver and Atkins Inorganic Chemistry, the $a_1$ orbital sinks in energy going from 90 to 180°. Furthermore, the $...
- 173
4
votes
2
answers
351
views
Interpretation of 1H-NMR spectra for Z-ochtodenol
I'm struggling to understand the 1H-NMR data for this compound. I managed to find the compound using the data I had, but at the end I can't assign the peaks properly.
My confusions are:
Shouldn't ...
- 587
3
votes
0
answers
66
views
Expansion of ideal gas in isothermic conditions
I'm doing this problem and I get a different value than the answer in a book. I'm not sure if the book is wrong or me.
At a constant temperature of $298~\mathrm{K}$, calculate $\Delta S_{\mathrm{...
- 151
1
vote
1
answer
4k
views
Ionic reaction between lithium and chlorine
I got a weird question in my chemistry book. It says Li and Cl react to form LiCl an ionic compound. Cl has .... electrons in its outermost occupied shell and the answer of the book is 6 electrons . ...
- 11
16
votes
2
answers
2k
views
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
...
5
votes
0
answers
905
views
Is phosphorus trichloride really a stronger Lewis acid than antimony pentafluoride?
The following was a question from the ETS Chem GRE guide and apparently this was an actual question on an exam a few decades ago. Unfortunately, no explanation for the answer was given, and I couldn't ...
- 1,143
4
votes
1
answer
889
views
How are partial molar Gibbs excess functions correctly defined?
I think I've found a mistake in my thermodynamics textbook, Chemical Thermodynamics for Process Simulation, but as thermodynamics is hard and I'm a relative novice, I wanted to check here.
The ...
- 547
1
vote
1
answer
944
views
What is the correct structure for sulfur dioxide? [duplicate]
A question from the National Chemistry Olympiad (Germany-2008) goes as follows:
Besides the composition of a substance the structure of its molecule or ion is of interest. To predict the structure ...
- 11
10
votes
1
answer
188
views
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 ...
- 6,263
2
votes
1
answer
4k
views
R configuration for cysteine
I think my prof made a mistake. Shouldn't the answer be 1, 4 and 5 instead of 2 and 3?
- 453
6
votes
1
answer
3k
views
Why is tert-Butyl (tBu) often not listed as protecting group for alcohol?
I am not seing tBu listed as alcohol protection group in all of these places:
https://en.wikipedia.org/wiki/Protecting_group#Alcohol_protecting_groups
http://www.synarchive.com/protecting-group/
http:...
- 627
0
votes
1
answer
2k
views
Deviation of real gases from ideal behaviour
From the Amagat's curve we can see two types of result for real gases.
If we increase pressure,the value of $PV$ decreases initially and then the value starts increasing for the gases like- carbon ...
- 181
0
votes
1
answer
8k
views
Why is Sulfur trioxide a neutral electrophile?
My chemistry book says, an electrophile is a reagent which is atrracted to electrons, therefore positive ions and reagents with incomplete octets act as electrophiles, Sulfur trioxide belongs to ...
- 121
6
votes
1
answer
3k
views
Elimination from Vinylic Halides
Vinylic halides do not show nucleophilic substitution at all, because of their stability due to resonance. But elimination to form alkynes is possible. No nucleophile at all can displace the halide ...
- 2,755
6
votes
2
answers
437
views
2,4-dinitrophenyl hydrazine test
I found this reaction over here:
which illustrates the carbonyl test but looks fuzzy.
Assuming that the R in the product is a typo for H, I couldn't conserve the number of Nitrogen atoms.
...
- 702
9
votes
1
answer
3k
views
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). ...
- 631
5
votes
1
answer
504
views
Energy of Eclipsed Interactions
I am asked to identify the highest and lowest energy conformations for the following bond-line structure (I think it is 2,2-dimethylbutane). I drew a Newman projection (for all 6 conformations) and ...
- 631
6
votes
1
answer
945
views
Bond-Line Structure for an Alkane
My textbook tells me the following structure is 2,2,5-trimethylpentane. I try to change the parent group in different ways so as to maximize the number of substituent groups, but I think the maximum ...
- 631
4
votes
1
answer
5k
views
Why is sand/glass polar? How does lattice structure change polarity?
The molecular geometry of sand is linear. Dipole moment is thus cancelled.
But we all know from the meniscus water makes with glass that the dipole-dipole/H-O attraction between sand and water is ...
- 379
6
votes
1
answer
151
views
Why would hexacyanidocobaltate(II) be uncommon while pentacyanidoaquacobaltate(II) is common?
In Huheey's Inorganic Chemistry it is written that hexacyanidocobaltate(II) is uncommon but pentacyanidoaquacobaltate(II) is common. Something is mentioned about Jahn-Teller distortion, but I don't ...
user14874
1
vote
1
answer
150
views
Oxygen Preventing the Formation of Large Organic Compounds?
My textbook tells me that when carbon bonds with oxygen, the electrons are too close to the oxygen, and therefore they cannot just string together and form large molecules like glucose. It goes on to ...
- 1,539
4
votes
0
answers
3k
views
Ratio of rate of diffusion of two gases under constant temperature and pressure
I'm consulting one of higher classes books to study chemistry. I had been studying Graham's Law and question related to rate of diffusion. I came across a question[1] which says:
Calculate the ...
- 105