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19 views

Oxidation of certain acids by potassium permanganate

Why does potassium permanganate oxidize formic acid and oxalic acid, but has no reaction with benzoic acid and acetic acid? EDIT (Apologies for the unclear question): The reactions were heated in a ...
1
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1answer
23 views

How can I find the Van der Waals constants (a and b) without any critical values?

I'm given a container of gas that is kept at constant temperature, and whose volume is decreased by applying pressure, from A to E, as the graph shows. I am given the temperature, the total moles in ...
1
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0answers
24 views

What should be IUPAC name of given compound (see image)?

I think the name should be 1-carbamoylpentane-3-sulphonic acid, but the answer sheet mentions it as 2-carbamoylpentane-3-sulphonic acid: Can anyone please explain why the chain starting with methyl ...
0
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0answers
4 views

Why is enol content more in 1,2 cyclopentanedione?

I am miserably confused on why would this compound exist in enol form , as I don’t see any driving force like aromaticity ,extended conjugation or active methylene like conditions over here.
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0answers
37 views

High temperature acids

Some of the proton production of an acid happens due to temperature and some of the proton production of an acid happens due to quantum tunnelling.But if we increase the temperature a lot the proton ...
-1
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0answers
19 views

Can a system be designed which equates reaction rates of endothermic reactions using a single power source?

My goal is to use a single source of heat in an experiment with 2 separate endothermic reactions. My hypothesis is that by conducting this experiment under water, the reaction time of both of the ...
13
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4answers
2k views

C-N bond lengths in 2-bromo-1,3,5-trinitrobenzene

Are all the $\ce{C-N}$ single bonds in 2-bromo-1,3,5-trinitrobenzene the same or different? I am of the view that the $\ce{C_1-N}$ and $\ce{C_3-N}$ bonds are of the same length and they are longer ...
-1
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1answer
35 views

Why is the rate of effusion of a gas inversely proportional to (absolute) temperature?

(iv) Rate of effusion of a gas: The rate of passing of a gas through an orifice may be given as: $$r = \frac{PA}{\sqrt{2\pi RTm}}$$ where $P = $ Partial pressure of the gas $A = $ Area ...
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3answers
296 views
+200

Identify the structure of the compound (C3H5NO) given its NMR chemical shifts

I am trying to figure out the structure of the compound $\ce{C3H5NO}$ given just the following data from the 1H NMR spectrum: $\delta 5.8 ~ \text{(singlet, 1H)}; \delta 6.2 ~ \text{(triplet, 2H)}; ...
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0answers
16 views

How to dispose of NaOH solution?

I have a range of sodium hydroxide solutions with different concentrations. (from 1.0 mol dm^-3 to 0.5 mol dm^-3). The max volume of each is 100ml. How can you easily dispose of these? Can I pour them ...
-1
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0answers
25 views

Structure of perchloric acid

I was asked to draw structure of $\ce{HClO4}.$ I drew this: $$\ce{H—O—O—O—O—Cl}$$ But my teacher told me that it is wrong. He drew this: Why is my structure wrong and his correct?
10
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2answers
7k views

Why does increasing number of salt bridges increase voltage of electrochemical battery?

In an experiment, I set up a cell with lead nitrate (w/ lead electrode) and zinc sulfate (w/ zinc electrode), with a salt bridge containing potassium nitrate. I observed that by increasing the number ...
2
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1answer
35 views

Why does dipole must lie parallel to a rotation symmetry axis?

While studying group theory, I've got confused by the following statement: For a molecule to have a permanent dipole moment, it must have an asymmetric charge distribution. The point group of the ...
3
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1answer
3k views

Difference between water solubilities of phenol and cyclohexanol?

The solubility of phenol is 83 g/L, while that of cyclohexanol is 36 g/L. Both of them have a hydroxy group, and can form hydrogen bonds with water. Also, the hydrophobic part of phenol, as well as ...
2
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1answer
26 views

AX Spin system ordering

I would like to ask a question about the ordering of the $\ce{X}$ spins on the right hand side of an $\ce{AX2}$ energy diagram. I was given the diagram here below: and asked to evaluate why this ...
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0answers
9 views

Is it true the molecular structure of a styrofoam is similar with the fat deposits that causes atherosclerosis?

A demo was exhibited showing fish oil on a styrofoam cup with hot water.... The exhibitor said the molecular structure of the styrofoamis similar to that of the fatty deposits causing atherosclerosis....
8
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1answer
1k views

Why Birch reduction of alkyne is E-selective?

From Organic Chemistry(Clayden, Greeves and Warren, 2nd edition), pp. 682: The sodium donates an electron to the LUMO of the triple bond (one of the two orthogonal $\pi^\ast$ orbitals). The ...
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0answers
15 views

Difference between Ziegler–Natta method and Phillips method

I have to compare the similarities and differences between the Zieglerr–Natta method and Phillips method of producing polyethylene. However, the only difference I can find is the difference in ...
-1
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0answers
9 views

Help with Alkyne Reactions for OCHEM [on hold]

I am not too sure on how to solve these, I have a midterm coming up kinda soon and I need help reviewing these problems because my professor isn't handing out answer keys!
2
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1answer
2k views

A thermos bottle containing milk is shaken vigorously

I have a conceptual physical chemistry question here. A thermos bottle containing milk is shaken vigorously. Consider the milk as the system. Will the temperature rise as a result of the shaking? ...
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0answers
13 views

Affect of temperature on concentration value of a known ethanol and water mixture

This question was originally put on hold as being too broad/vague a question without any explanation of how its too broad a question. I have made this question as specific as I possibly can. If it is ...
-3
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1answer
20 views

Can there be a compound which stops the pesticide from entering into the fruit or vegetable?

Can there be a compound which stops the pesticide from entering into the fruit or vegetable? For example, a solution which is sprayed before pesticides and somehow blocks pesticides from entering into ...
4
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1answer
37 views

pKa of phenols using UV-Vis spectroscopy

I have done an experiment where I dissolved four different substituted phenols in acidic, basic, and buffer solutions, and recorded the UV-Vis spectra for each. I'm supposed to pick a wavelength where ...
-3
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1answer
31 views

Calculating pressure [on hold]

Calculate the pressure in Pa of a 760mm column of mercury when the density of Hg is 13.5951g/cm^3 at room temperature. P= dgh P=(0.0135951kg/cm^3)(9.81m/s^2)(0.76m) P=0.101 Where did I go wrong? ...
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0answers
11 views

How does the phase inversion temperature of an emulsion depend on the oil - water ratio?

How does the phase inversion temperature (PIT) (fish tail point) in the fish-like diagrams of an oil - water - surfactant emulsion depend on the oil - water ratio? The HLD (hydrophilic-lipophilic ...
4
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1answer
73 views

Nanocar racing competition and the race tracks used

In the Nanocar race competition the molecules are raced on a gold surface. Is there a specific property of gold that it forms a good "racetrack"? On what criteria does it compare with other metal ...
9
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3answers
6k views

Stability of superoxides of alkali metals

Why are superoxide ions stable only in presence of large cations such as $\ce{K}$, $\ce{Rb}$ and $\ce{Cs}$?
4
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1answer
2k views

Improving efficiency of absorption refrigerator (ammonia+hydrogen)

Apologies if this is not the right forum for this question, I checked the Physics side and there's no questions on this, whereas there's at least one other question here about absorption refrigeration....
1
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1answer
57 views

The “nose” of the periodic table [on hold]

My teacher said that on the periodic table there is a "nose" formed by Al, Zn, Ag, and Cd. She said that they are all fixed charged (+3, +2, +1, and +2 respectively), and said that if I write them in ...
3
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0answers
26 views

Can a per-acetylated sugar anomerize?

So I have a question concerning a reaction mechanism for the reaction below. I know for certain that I get the alfa anomer, but I can't explain it. When I draw out the mechanism it doesn't make sense ...
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0answers
29 views

Reaction of Glucose and Hno3

Can anybody tell me why the 2˚ alcohol group didn't get oxidize even though conc. hno3 is one the strongest oxidizing agent?
11
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3answers
7k views

Why is the outermost part of the Bunsen burner flame not the hottest region?

Why is the blue flame the hottest on a Bunsen burner? I thought the outermost part of the flame must be the hottest region because of complete combustion of gases taking place there. Where am I ...
-3
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0answers
37 views

Stability of oxohalogen species

Why the higher oxides of a halogen are more stable than the lower ones? I know that the stability order of oxides of chlorine is $$\ce{HClO4} > \ce{HClO3} > \ce{HClO2} > \ce{HClO}$$ But I ...
1
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0answers
23 views

How many times should I run a solvent extration experiment through?

For advanced higher chemistry project, I am extracting cinnamaldehyde from cinnamon via first steam distillation and then solvent extraction using hexane. I'll be adding sodium chloride to the water/...
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0answers
26 views

Gold and gold oxide redox reaction in water [on hold]

Can anyone tell me if a redox reaction of gold or gold oxide will occur in water around body temperature? I'm trying to figure out a redox reaction for two metals with saline being the conductive ...
0
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3answers
94 views

How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
1
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1answer
13 views

Rate of reaction- Arrhenius equation [on hold]

Can the Arrhenius equation be used if the reactants are in the solid state and if I can use it for any state, how do I do so?
-1
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0answers
29 views
-1
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1answer
36k views

Order of nomenclature precedence among these functional groups

The order of precedence for functional groups I have so far is: carboxylic acid ester amide aldehyde ketone alcohol amine multiple bonds ether organic halide I'm pretty confident that from 1 to 7, ...
26
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3answers
46k views

How to derive these general formulae for number of stereoisomers of a compound with a possible plane of symmetry?

These formulae are used if the molecule has a possible plane of symmetry. One such example would be: Here the carbons marked with an asterisk are stereogenic centres (the asterisk is not used to mark ...
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1answer
12k views

How to balance the reaction equation of potassium permanganate, calcium oxalate, and sulfuric acid step by step?

I have been desperately trying to balance the following equation, and finally (ultima ratio) used an online program to get it done (posted the same question there as well). $$\ce{KMnO4 + CaC2O4 + ...
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0answers
15 views

Equivalence concept [on hold]

When excess of CaCO3 is treated with 100 ml of HCl solution.The CO2 gas obtained was found to be 1.12 l (at N.T.P).What is the Normality of HCl?
0
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1answer
37 views

pH and pKa relationship of LaCl3 in water and its percipient La(OH)3

In light of this question and its answers, I hope to get some insights into the pH of LaCl3 in water and its pH relationship to La(OH)3 percipient's pKa? What can be done in order to prevent LaCl3 ...
5
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1answer
133 views

Reduce Decomposition Of Glycerin

Background: Glycerin, when heated with a metal coil, decomposes below its boiling point to acrolein, which in turn appears to decompose to formaldehyde and acetaldehyde. (see previous post) Question: ...
5
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2answers
526 views

How can f-f transitions happen?

The question might seem quite easy to answer but still I am unable to find any useful information. I am aware of laporte- or symmetry-forbidden transitions and for f-f also spin-forbidden transitions ...
1
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0answers
22 views

Dissolving plastic resin without damaging aluminium surface

I have an aluminium surface covered with some plastic, which I intend to dissolve in order to clean the surface. On the note for the plastic I have applied, it says that it contains the following: 2-...
8
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1answer
1k views

Comparing pKa of hydrocarbons

We have to compare their acidic strength, and we know acidic strength is directly proportional to stability of the anion. So the first compound is more acidic due to its being aromatic after ...
7
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3answers
2k views

Why does radiocarbon dating only work in nonliving creatures? [duplicate]

I understand how carbon dating works, though I do not understand why it doesn't happen while a creature is living. Because while we are alive we still have carbon 14 in us, so shouldn't it work?
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0answers
36 views

What is the proper IUPAC name for the structure shown below? [on hold]

I figured the longest chain is 7, root name is Heptane. Side groups are Ethyl and methyl. Ethyl has the lowest combonation of (2, 5 ) . Would it be 4-ethyl-2,5-dimethylheptane?
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0answers
17 views

Order of reaction in adsorption process

(1) $\ce{PH3(g) <=>[W]PH3(adsorption)->[W]P(s) + 3/2 H2(g)}$ The decomposition of phosphine on tungsten surface at low pressure is a pseudo first order reaction. This is because the rate of ...

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