# All Questions

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### 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.
25 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 ...
24 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 ...
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 ...
27 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?
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 ...
20 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 ...
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....
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 ...
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!
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 ...
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 ...
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 ...
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? ...
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 ...
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 ...
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 ...
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?
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 ...
29 views

### I wonder if the molecule coohcocooh exists and what is the Ka [on hold]

If you could insert CO in between the COOH of oxalic acid. Tack
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/...
38 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 ...
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?
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?
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 ...
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-...
38 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 ...
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 ...
58 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 ...
29 views

### Why does atomic spectrum of calcium obey bohr model?

We know that Bohr model can only define the atomic spectrum of single electron species.But during flame test,orange rays are emitted when calcium is heated.Our chemistry teacher taught its theory ...
27 views

### Need a container filled with gas phase anions (negatively charged gas molecules/particles) for an experiment [on hold]

Does this even exist? How could I get it? Could I make it? I know that most gas molecules/particles have an overall neutral charge. But I need gas phase molecules with an overall negative charge (i.e ...
13 views

### Low Spin vs High Spin Ligands

Is Fe(S2O3)2(H2O)2 a high spin or low spin complex? Fe has a charge of 2+. I can't find S2o3 in the stoichiometric series for crystal field theory, and I am new to crystal field theory, so I don't ...
13 views

### Why does the metallic bond between the atoms become weaker down the group 1 elements? [on hold]

Is it related to the electron arrangement of the elements?
20 views

### Analysis of a partial structure as opposed to a complete molecule [on hold]

Hello, I have this question, and I could calculate the valence electrons, etc. for the shown structure, but it says that this is a "partial structure". Our class is behind because several were ...
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 ...
18 views

### Calculating the pH of a mixture of glycine and sodium hydroxide [on hold]

What is the pH of a total 500 ml solution of 0.20 mol of glycine and 0.025 mol of NaOH? I believe the pKa of the amino group is approximately 9.6; the pKa of the carboxylic acid group is 2.8. Are ...
18 views

### Is there a solution which can remove pesticide residue on fruits and vegetables, yet not be harmful to humans? [on hold]

Is there a solution which can remove pesticide residue on fruits and vegetables, yet not be harmful to humans? I want to test different home-made solutions and their effects on the pesticide residue ...
23 views

### Why does 50/50 isopropyl alchohol and water mix evaporate faster than isopropyl alcohol? [on hold]

Today I did a lab and I took three thermometers for Logger Pro and then dipped them each in a liquid for 3 min (one is isopropanol, one in water and one in a mixture of 50/50). When I took them out ...
13 views

### Resonance in chemistry and its cause? [on hold]

Can someone please explain what actually is resonance in chemistry and why is this concept used in chemistry to explain stability of organic compounds?
15 views

### Original reference of multiplicative coupled equilibria [on hold]

Can I know what is the peer-reviewed reference behind the multiplicative nature of two equilibrium constants of two reactions that are additive? Example:
27 views

### What determines the atom or molecule that receives electrons during oxidation?

I'm no chemist, so bear with me. From my understanding, the reason metal oxidation occurs is because the metal is losing electrons to the oxygen ions in the air; and that an ion is an atom or ...
69 views

### Is PCl5 really trigonal bipyramidal in shape?

We know that the structure of $\ce{CH4}$ is tetrahedral, and not planar tetragonal, as a tetrahedron enables maximum distribution of $\ce{H}$-atoms in space, as they repulse from each other. This is ...
34 views

### Do colligative properties depend on the number of solute molecules?

Colligative properties are properties that are affected by the number of solute molecules dissolved in the solution. True or false? I think the statement is false, and the correct one should use "...
2k views

### What is the scientific term to describe the operation of a bong?

What is the scientific term for the separation of dust particles from air by suction through a specialized flask in a way similar to the operation of a bong? The thing that led me to this was a ...
33 views

### Can Michaelis-Menten constant be zero in the Michaelis-Menten Equation, or is this a non-zero constant?

Can Michaelis-Menten constant be zero in the Michaelis-Menten Equation, or is this a non-zero constant? I am applying the equation in epidemiology so I wanted to assume that it is zero but I am not ...
82 views

### What happens when Ar and HCl are mixed at 77 K? [on hold]

So our teacher asked us a simple question in the classroom: What happens when Ar and HCl are mixed at 77 K? and no other information was given. We replied various possible answers for that such ...
22 views

### Why does the metallic bond become weaker but the van der Waal's forces become stronger as the atomic radius increases? [on hold]

I just learned about the periodic table of elements. I was wondering what differences between van der Waal's force and metallic bond are. I'm just a rookie in chemistry. Can anyone please correct me ...
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?