0
votes
0answers
7 views

How many Onkalo-sized facilities would be needed to store waste from the nuclear exploitation of all the uranium of the Earth?

In the "Into Eternity" movie, it is said that the uranium is a limited resource, like petroleum. Then one day there will be no more uranium. It is said, too, that the Onkalo facility will only take ...
0
votes
0answers
18 views

Calculation of mass from mmol/L

Sorry I understand this looks like a "homework question", (I'm actually a 46yr old dentist looking to see what amount of calcium phosphate should be effective in a proprietary toothpaste!). However, ...
1
vote
0answers
36 views

Hybridization in PH3

Does $\ce{PH3}$ exhibit $\ce{sp^3}$ hybridization? Arguments against hybridization: $\ce{PH3}$ is less basic than $\ce{NH3}$. This jibes with the supposition that $\ce{PH3}$ keeps its lone pair ...
2
votes
0answers
19 views

Carbon Oxides and stability

If C2O4 is very unstable no matter the configuration(that is the structure based on the bonds) and especially unstable in the form that has an oxyanion and a carbocation than how come other carbon ...
0
votes
0answers
15 views

Why is up spin in the px orbital and down spin in the py orbital considered an excited state?

Why is this form of p orbital occupation an excited state? I understand that there should be one up spin and one down spin in one orbital box by Pauli's exclusion rule. But in the p orbitals, it ...
1
vote
1answer
27 views

Why do all medicines require storage temperatures below 25 °C?

Almost all medicines I buy have storage requirements saying $T\le25^\circ C$. But do they really spoil at higher temperatures? What if they are stored at e.g. $30^\circ C$, which is common at ...
0
votes
1answer
16 views

Which disaccharide is this?--Is it sucrose?

I want to know if the structure I made is sucrose or an enantiomer of it The One I Made The one on internet
0
votes
1answer
29 views

Molecules with more than 1 functional group

I need some help naming compounds with more than 1 functional group. Here are some examples: A 4 carbon alkane with an aldehyde and a ketone for both the ketone being right next to the aldehyde and ...
0
votes
1answer
27 views

How do you calculate enthalpy for a reaction at non-standard conditions?

I understand how to calculate the change in enthalpy and entropy for a reaction in standard conditions, but is there a way to calculate these values at non-standard conditions? Also, is there any way ...
1
vote
1answer
24 views

Can one reduce solubility of NaCl by adding CO2 under pressure? Will the salt fall out of solution?

One can salt CO2 out of solution by adding salt to carbonated water. Can one do the reverse? If one adds more and more CO2 to the water under pressure, can you drive out the salt?
1
vote
0answers
11 views

How does propylene glycol/glycerin form formaldehyde/acetaldehyde when vaporized with a vaporizer?

So apparently, e-cigarettes produce formaldehyde/acetaldehyde because they vaporize propylene glycol/glycerin. What is the chemical reaction through which propylene glycol/glycerin forms ...
1
vote
1answer
39 views

Steric Hindrance and Bronsted Basicity

Does steric hindrance affect Bronsted basicity? I understand that basicity is a thermodynamic quality. Not a kinetic factor. So it doesn't matter if it takes a million years for the proton to reach ...
4
votes
1answer
80 views

-ic -ous nomenclature

I recently came across a practice problem in my textbook asking me to name a few compounds using -ic and -ous endings. The exact wording is: Write the name of each of the following ionic substances, ...
0
votes
2answers
19 views

Finding the value of stoichiometric coefficient x

$\ce{2A_{(s)} + xB_{(g)} <=> 3C_{(g)}}$ $K_p=19.3, K_c=0.45, T=523K$ I work $\Delta n$ to be 1, So would $x$ be 1 or 2? I'm not sure if the coefficient is part of $\Delta n$.
1
vote
1answer
31 views

SN1 reaction of ethanol at tertiary alkyl halide

I know this undergoes an $\ce{S_{N}1}$ reaction: Ethanol is the solvent. Weak nucleophile. Neutral nucleophile. This points toward $\ce{S_{N}1/E1}$ (competing pathways). The leaving group is on a ...
3
votes
3answers
90 views

E2 Elimination; Anti-periplanar beta hydrogen

I'm confused by this picture I found online on a very popular organic chemistry website: (http://www.masterorganicchemistry.com/2012/10/10/comparing-the-e1-and-e2-reactions/) I agree that the ...
2
votes
1answer
58 views

Can anyone explain the reaction mechanism of these two synthesis?

Can anyone explain the reaction mechanism of the two synthesis given below ? $\ce{Ar-NO2 ->[\ce{H2/Pd}][\ce{EtOH}] Ar-NH2}$ $\ce{Ar-NO2 ->[\ce{Sn + HCl} \text{ or } \ce{Fe + HCl}] Ar-NH2}$
0
votes
3answers
47 views

Why cellphone batteries are still bad?

There are constantly new features in cellphones over the years, but it seems like batteries are not getting any better. Why is that?
0
votes
1answer
33 views

How to study chemistry effectively, quickly and enjoyably [on hold]

I'm not sure if this question belongs in the meta section or not, and if it does, do tell me and I'll repost it elsewhere, thanks! Basically, I have 40+ days to my final exam. I've been trying to ...
0
votes
1answer
39 views

calculate the amount of energy in KJ necessary to convert 346 g of liquid water from 0 C to water vapor at 182 C

Calculate the amount of energy in $\mathrm{KJ}$ necessary to convert $346~\mathrm{g}$ of liquid water from $0~^\circ\mathrm{C}$ to water vapor at $182~^\circ\mathrm{C}$. The correct answer is ...
2
votes
1answer
22 views

Difference between torsion, out of plane, coplanar and perpendicular bends?

In Infrared spectroscopy, stretches are easily understandable. But, how do I visualize (or conceptually understand) the difference between dihedral (torsions), out of plane bends, coplanar bends, and ...
2
votes
2answers
45 views

Are non-ionic compounds generally as dehydrating as ionic compounds in drinking water?

In order to turn sea water into drinkable water, virtually all of the salt must be removed. By definition, salts are ionic compounds. I am assuming that there are other non-ionic compounds devolved ...
1
vote
1answer
33 views

Can very dilute acids exposed to air become more concentrated as water evaporates?

If a very minute quantity spilled acid (e.g. $\ce{H2SO4}$, though the question would apply to other acids as well) is cleaned up with water (e.g. yielding a $0.0001~\mathrm{M}$ solution), and some of ...
1
vote
1answer
45 views

Calculating Ka values from std. state thermodynamic data

My professor showed us a sample calculation of the Ka value for a strong acid. He used standard state thermodynamic data. I have an issue with this: 1) Wouldn't this give us an understated Ka ...
0
votes
4answers
52 views

How to detect if a beverage has Sucralose or aspartame?

There is a drink that claims to be sweetened with stevia, but I think I taste Sucralose in there even though it is not listed on the ingredients. Is there any easy way I could test for the presence ...
1
vote
1answer
556 views

Does ice melt faster when submerged in water?

Suppose you have a container with a drain at the bottom full of frozen H2O which you leave a room temperature to melt. Will the ice melt faster if you drain the water as it melts? I would expect that ...
1
vote
1answer
23 views

Rearrangements; Carbocations; E1 Mechanism

If the leaving of the leaving group creates a secondary carbocation, and a tertiary carbocation has the possibility of being formed through a 1,2 methyl shift: 1) Will the methyl shift? I'm guessing ...
2
votes
1answer
49 views

Electronic configuration of Ace-Ala-Nme

Below is the structure of Ace-Ala-Nme. I have labelled just four of the carbon atoms (1-4 in blue). I need to identify (i) the hybridization state, and (ii) the number of electron withdrawing groups ...
1
vote
2answers
34 views

Are homemade batteries a practical alternative during a blackout?

If your home lost power without warning; are homemade batteries (such as the lemon/potato variety described in this question Are homemade batteries economically practical?) a practical alternative for ...
0
votes
2answers
32 views

When using Gaussian to calculate NMR, what's the default solvent and frequency?

If I choose GIAO HF/STO-3G, is the default solvent $\ce{CD3Cl}$? Is the default frequency for $\ce{^1H-NMR}$ 500 MHz? What about the frequency for $\ce{^13C-NMR}$?
1
vote
1answer
29 views

“Electrwd” group?

The Amber force field parameters describe hydrogen atoms in various states: ...
5
votes
1answer
33 views

Reaction mechanism of combustion of H2?

After a discussion about the usefulness of hydrogen fuel for cars with a friend of mine, I wondered what the reaction mechanism for combustion of $\ce{H}_2$ was. I only study (well almost) organic ...
2
votes
1answer
39 views

Organic chemistry textbook for self-learning?

I am interested in learning organic chemistry in order to solidify my knowledge of molecular biology. However, there are a lot of options for organic chemistry textbooks, and I plan on simply ...
1
vote
0answers
46 views

Invariants in chemistry used for model selection

What invariants related to geometrical structures that describe molecular geometry are used in chemistry? Explanation: Here, Electronic model with highest prediction rate…, one can learn about ...
1
vote
1answer
15 views

Adsorption on surface of adsorbent

Why is energy released during the process of adsorption? How is this energy change observed and how is it calculated?
0
votes
0answers
39 views

Mathematical model of isomerism

Does there exist a mathematical model of isomerism? (a model which is capable of predicting, for given circumstances, the re-arrangement that is going to occur, e.g. Demjanov, Wagner-Meerwein etc.). ...
2
votes
1answer
18 views

Difference between nickel catalyst and Raney nickel catalyst

Many times i have seen the catalyst as Raney nickel instead of nickel catalyst. I think Raney is a name of chemist who discovered Raney nickel catalyst.I think Raney nickel catalyst and nickel ...
4
votes
2answers
336 views

Are homemade batteries economically practical?

Every kid who has been to a science fair knows that you can make a battery with a lemon, a potato, a penny and a nail. I've never done this and I'm not entirely clear on how it works beyond a hazy ...
2
votes
1answer
23 views

Which azo compounds are found in DVD-R and CD-R media?

Does anyone know which specific azo compounds are used in DVD-R/CD-R recordable media?
0
votes
1answer
34 views

How to find out if ions are oxidised/ reduced based on half cell potentials

I have a hw question that I keep getting wrong and I need some help on? Assuming standard conditions, answer the following questions. (yes/no) Is $\ce{Fe^{2+}(aq)}$ capable of reducing ...
3
votes
1answer
17 views

Chemistry of Walter Mitty's negative developer/stop bath/fixer?

I asked a question here How can Walter Mitty examine the negatives of photos in the bright sunny day? Commonly known, there are three steps using chemical baths to bring out the images of negatives: ...
1
vote
1answer
45 views

Why is B2 paramagnetic?

Why is B2 paramagnetic? It's just 2 borons with a triple bond between them. Aren't all the electrons paired?
3
votes
1answer
25 views

can sodium persulfate etch or damage a titanium heater?

I use Sodium Persulfate to etch copper on a PCB process. I have been using glass heater on the etching tank but the glass is too fragile; it breaks too easily. I read that titanium heater is used ...
3
votes
1answer
96 views

Why is the Chlorine missing an electron in Chlorine Monoxide?

I was asked to draw the lewis-dot structure for ClO and I drew this: .. .. :Cl- O. .. .. The correct answer is apparently this: ...
5
votes
1answer
71 views

Electronic model with highest prediction rate

Among many models, including the valence bond model (VB) or the molecular orbital (MO) model, which are the ones with best predictive power? (e.g. the MO is thought to predict spectroscopic ...
1
vote
1answer
41 views

Electric field effect on reactions

What would be the effect of putting a solution in a strong electric field? Would the reactions in the solution be affected? I'm thinking yes - lots (if not all) - chemistry is dependent on charge ...
2
votes
1answer
32 views

Relationship between rate equation and equilibrium constant

I have read mannaia's answer on the question of 'rate order and confusion', as well as Nicolau Saker Neto's answer to a related question. They have both been very helpful. As I understand, the ...
5
votes
2answers
439 views

is this statement always true? : The more -OH functional groups in the molecule, the more is its viscosity

Is the following statement always true? The more $\ce{-OH}$ functional groups in the molecule, the more is its viscosity? I think it is true, because it is known that weak intermolecular forces ...
5
votes
1answer
86 views

Entropy - “Wiggle”?

The title is not a reference to a Jason Derulo song. In any case: 1) How is change in entropy measured, experimentally? I've Googled this for a bit and I've found all sorts of mathematical ...
4
votes
1answer
59 views

IBrF2 - van der Waals repulsions - and number of unique bond angles

I understand that the molecule $\ce{IBrF2}$ is T-shaped, with three ligand atoms and two non-bonding pairs. However, how many unique bond angles can this molecule exhibit? My professor argues for ...

15 30 50 per page