All Questions

Filter by
Sorted by
Tagged with
2
votes
0answers
33 views

How Does Internal Resistance of the Galvanic Cell Affect Voltage Drop of the Cell?

When galvanic cell operates or when current starts flowing in a circuit, voltage drops from electromotive force of the cell (EMF) because of internal resistance of the battery. There are three sources ...
1
vote
0answers
30 views

How to estimate temperature loss of a mixture when we know the heat loss due to vaporisation of one of the component?

So I am modelling in Chemkin and want to include phase change phenomenon in my model. But there's no capability of phase change in Chemkin so I have to think of some out of the box method for this. So ...
0
votes
0answers
21 views

Mix Liquid Paraffin and Distilled Water [closed]

I am trying to dilute Liquid Paraffin in water, I tried SLS but the foam is much. Please what should I do? Thank you and Best Wishes.
1
vote
1answer
74 views

Calculating pH of aqueous ammonium hydrogen sulfide solution

I was doing the following question yesterday: Calculate the pH of a $\pu{0.1 M}$ solution of $\ce{NH4HS}$, given $\mathrm{p}K_\mathrm{b}$ of $\ce{NH3}$ is $4.74$, and $\mathrm{p}K_\mathrm{a1}$ and $\...
-4
votes
0answers
27 views

What is this chemical C5NH9 and C5NH11 name? [closed]

I want to know chemical compound C5NH9 name Also I want to know chemical compound C5NH11 name which don't have double bond
-4
votes
0answers
13 views

In vanderwall's correction why the excluded volume b is smaller than the molar volume of gas? [closed]

This question is from the topic volume correction in vander wal equation . Vgas=Vvessel - nb Where b is excluded volume Now the question i was asked is that why excluded volume is smaller than the ...
-1
votes
1answer
43 views

Can a free electron absorb a photon? [closed]

Can an already moving electron absorb a photon and show photoelectric effect ? For example in a wire having some current, electrons are already moving, So, if we shine a beam of light having suitable ...
-5
votes
1answer
36 views

Identifying products [duplicate]

How to determine the major and minor products in a reaction? What factors are useful to do so? For ex: Nitration of phenols, gives the ortho nitro phenol as the the major product and para nitro phenol ...
0
votes
1answer
46 views

E and Z nomenclature of this compound [closed]

Why is this compound classified as Z instead of E?
-1
votes
1answer
58 views

Are Hyperconjugation structures real? [duplicate]

Do hyperconjugation structures oscillate between each other or they just like resonance exist as a hybrid form and hyperconjugation is just a hypothetical concept to explain these structures?
-4
votes
0answers
22 views

Phosphoric acid is tribasic, with pKa’s of 2.14, 6.86, and 12.4. What ionic form predominates at pH 3.2? [closed]

I understand that at lower pH, the molecules will be fully protonated, however, when given a certain pH like pH 3.2, is it correct that I choose to refer to pKa=2.14 as it is the closest to the pH?
2
votes
1answer
61 views

Looking for a compound that when mixed with sugar will burn when a drop of water is added

Years ago, I watched a Johnny Carson episode where a guest on the show mixed a compound with ordinary table sugar and added a drop of water and the mixture burst into flames. I went and bought the ...
0
votes
0answers
18 views

why should we add the fat slowly when making an emulsion?

I'm sorry if this is in the wrong place but recently I realized that every time I got told to make an emulsion even when cooking (ie making mayo or cake batter) it is instructed to add the fat (or ...
1
vote
0answers
29 views

Are oxides of sulphur and carbon adsorbed into limestone/marble?

Oxides of sulphur and carbon are commonly present in the atmostphere in areas close to industries, can such oxides get adsorbed into the surface of limestone and marble and cause discolouration and ...
2
votes
0answers
52 views

Which step is the rate determining step in Benzyne mechanism - Elimination or Addition?

I have this doubt for a while now: How can we compare the reactivity of two compounds towards benzyne mechanism, which have different leaving groups (E.g. chlorobenzene and bromobenzene)? To know this,...
-1
votes
0answers
25 views

How do we know that nitrogen and carbon share a triple bond? [closed]

I am studying for a final and forget why. When drawing stereochemical formulas, there are three lines connecting carbon and nitrogen and I do not know how we know that nitrogen and carbon share the ...
-1
votes
0answers
13 views

I need to know the decay rate of h202 mixed with water [closed]

I am trying to find the chemical decay rate of H2O2 34% Water66% mixed with tap water at a 1 to 3 parts water
3
votes
0answers
33 views

Quantum chemistry Python package to solve the Coupled-Perturbed Hartree–Fock equations

Two of the most well-known Python quantum chemistry pakcages, PySCF and Psi4, can solve the Hartree–Fock equations. However, I am interested in finding analytic derivatives of the electron integrals: $...
0
votes
0answers
38 views

If a solvent can dissolve ionic compounds (water, ammonia) and metals are made of ions, then why can't said solvent dissolve a metal? [closed]

Here the solvent won't react with the metal(eg ammonia and sodium), and would the metal dissolve if there was no oxide layer?
-3
votes
1answer
43 views

Relation between common ion effect and the temperature of the solution [closed]

Adding extra Na+ in a saturated NaCl/water solution decreases the solubility of NaCl. How does this exactly happen? AFAIK, the solubility of a solid only decreases with the temperature of the solution....
2
votes
0answers
63 views

Molecular orbitals energy under pressure

Suppose we have a hydrogen molecule $\ce{H2}.$ At room temperature the average distance of the nuclei is $r_0$ (without applying pressure). If we put $n$ hydrogen molecules in a box with volume $V_\...
-3
votes
0answers
46 views

Does Sodum Hypochlorite(NaClO) and Sodium Hydroxide(NaOH) react in Salt water? [closed]

I Wanted to know if $\ce{NaClO}$ reacts with $\ce{NaOH}$ in Salt water. Now that I am adding both chemicals at different time in a process, I wonder if it would react if I add both at the same time?(...
-1
votes
0answers
60 views

Is it safe to open old 100% isopropyl alcohol [closed]

I have a 3 month expired 1 quart bottle of 100% isopropyl alcohol. Someone gave it to me last year when covid started and I totally forgot about it. I believe it’s never been opened. I was originally ...
-1
votes
1answer
35 views

Is there any condition where alcohol oxidizes in presence of chromium trioxide to give carboxylic acid [duplicate]

My text book says that alcohol in presence of $\ce{CrO3}$ will only give aldehyde. But I then saw this question in which $\ce{CrO3}$ oxidizes alcohol directly to carboxylic acid. I need to know in ...
-5
votes
0answers
24 views

Would you help me with this topic? [closed]

Starting with the malonic ester and any other organic or inorganic reagents you want using. Design the synthesis of 4-methylhexanoic acid below.
0
votes
0answers
14 views

State character meaning [closed]

Can someone explain what the state of "3 1 E" means? I know the 1 stands for singlet, but what does the 3 and the E stand for? Thanks!
0
votes
0answers
26 views

I have conducted an experiment exploring surfactants and their role in surface tension [closed]

I measured the radius of a water droplet without a surfactant. I then applied a layer of a surfactant and measured the radius of the water droplet on this coated surface. The radius of the droplet on ...
0
votes
0answers
30 views

While adding simultaneous equilibria , when is the dissociation constant of both reactions the same?

I have a doubt regarding chemical and ionic equilibrium .In reactions involving simultaneous equilibria , instead of analysing the equilibrium simultaneously we sometimes add/substract both the ...
4
votes
0answers
60 views

Mechanism of Wiliamson Synthesis

I was studying about Williamson's Synthesis, and my textbook had the following statement: Williamson's Synthesis is a nucleophilic substitution reaction and proceeds via $\ce{S_N2}$ mechanism. Then ...
2
votes
1answer
84 views

Effect of d-orbital electron shielding on atomic radius

In a standard book it is given: "Atomic radius of Gallium is less than that of Aluminium. This can be understood from the variation in the inner core of the electronic configuration. The ...
0
votes
1answer
15 views

Do ambident nucleophiles form functional isomers?

I came across cyanide and isocyanide in an example for functional isomerism. As they are also ambident nuclephiles, I wanted to know if other ambident nucleophiles would also exhibit functional ...
9
votes
1answer
316 views

Why is a conformer of hydrogen peroxide rotationally inactive?

Hydrogen peroxide may exist in four different forms depending on the dihedral angle, $d = \angle\,\ce{H-O-O-H}$. The four conformers are: Conformer I with $d = 0^\circ$, Conformer II with $d = 60^\...
0
votes
0answers
34 views

In benzyne intermiediate of anisole why -I effect of OCH3 is considered not +M effect of it?

Here they considered -I effect of $\ce{OCH3}$ so carboanion is stable at orthroposition; But $\ce{OCH3}$ also shows $\text{+M}$ effect if $\text{+M}$ is shown carboanion will be stable at meta ...
3
votes
0answers
31 views

Action of Fuller's Earth on Marble and Limestone

Using Fuller's earth is a very common and harmless way to treat marble and limestone that has been damaged/corroded by atmostpheric pollutants such as PM2.5/PM10 carbon particles (Soot) , Oxides of ...
-2
votes
1answer
62 views

Cause of reversible reactions in terms of Gibbs free energy

Heading I recently learned about the standard Gibbs free energy change of reaction, ΔG=ΔH-TΔS, and how its sign indicates whether the conversion of (ALL) reactants and products is spontaneous or not. ...
0
votes
1answer
45 views

How can I filtrate Pd2(dba)3 and P(o-tol)3? (Celite filtration failed)

I am conducting an organic synthesis involving Stille coupling, using $\ce{Pd2(dba)3}$ and $\ce{P(o-tol)3}$ as catalysts. Reaction solvent is toluene in which the catalysts also dissolve. Many texts ...
2
votes
0answers
52 views

Calculating the apparent molecule length from density of the bulk [closed]

I'm interested to estimate the apparent length of the water molecule assuming it could be approximated as a cube. This is an intentional simplification. Calculating molecule length from volume in ...
-1
votes
0answers
17 views

Could freezing water or making jelly interpreted as a carnot cycle? [closed]

This was a question of a homework, but I'm really confused if it really makes sense. All that I read about carnot cycle always involves gases and even if those cases are reversible process how do we ...
7
votes
1answer
456 views

Can hydrogen peroxide reduce ferric ion to ferrous ion?

I have studied that hydrogen peroxide always oxidizes ferrous ion to ferric ion (source of study : NCERT Chemistry Part II, Textbook for Class XI), but a question came in IIT JEE 2015 which states: ...
-3
votes
0answers
18 views

Calculate the lattice energy of rubidium fluoride from the following data [closed]

Calculate the lattice energy of rubidium fluoride from the following data: Heat of sublimation of Rb(s)= +36kJ/mol ; Standard heat of formation of RbF(s)= +155kJ/mol ; Ionization energy of Rb(g) = +...
-1
votes
0answers
40 views

Finding shortest C=O bond length [closed]

I'm confused with this question. I get the feeling that in the presence of electron-donating groups, the bond length should increase, but I'm not sure why. Can someone help me out here? Thanks.
0
votes
2answers
47 views

Is a hydrocarbon necessary for combustion? [closed]

Oxygen, heat and fuel are essential for combustion. What counts as a fuel? Is a hydrocarbon essential for combustion? Is combustion, say, of magnesium really combustion? And what's the difference ...
-2
votes
0answers
38 views

How do you precisely change the pH with calcium carbonate? [closed]

I produced some tamarind juice (made of boiled and filtered tamarind). Tamarind has a high content of tartaric acid. The $\mathrm{pH}$ is at $3.30$ which is too acidic for consumption. I want to raise ...
2
votes
0answers
45 views

What is/was “uraneous oxide”? Was it an accepted name for a compound or mixed oxides of uranium?

In This National Technical Reports Library page for a 1965 report Method for Coating Actinide Particles in the list of keywords both Uranium compounds and Uraneous oxide are listed. But I don't find ...
-1
votes
0answers
15 views

How do you determine the Lewis formula using VSPER theory when one or more double or / and triple bonds occur? [closed]

I have some questions about determining the Lewis formulas of molecules. I basically proceed like this: if a molecule consists of two atoms, I draw it linearly, and select the bond so that if one ...
1
vote
0answers
18 views

Confusion regarding nucleophilicity [duplicate]

My teacher told me that to compare nucleophilicity, check the size of the attacking atom. Bigger the attacking atom more the nucleophilicity. But while reading Solomon, I found out that the order of ...
7
votes
2answers
328 views

Looking for caffeine partition coefficients

As part of a project, I'm looking to carry out a liquid-liquid extraction of caffeine from an aqueous phase to an organic phase, using dichloromethane or ethyl acetate. So I'm looking for the ...
7
votes
1answer
104 views

How to understand the chemical formula of Prussian blue complex w.r.t its crystal structure?

Note: Just to be clear, I do not refer to "complex molecules" (i.e. "complex" as "complicated"), but to actual complexes. I am trying to understand the structure of ...
6
votes
0answers
59 views
+50

Temperature control and side reactions in PPAA (T3P) couplings

In a lot of procedures for amide couplings (acid + amine) using PPAA, the coupling agent is added to a cooled solution of the acid, amine, and a non-nucleophilic base such as DIPEA. This is done even ...
-1
votes
1answer
52 views

How can we predict the formula of a coordination compound by just knowing the ligand and central metal?

Question: On complete reaction of $\ce{FeCl3}$ with oxalic acid in aqueous solution containing $\ce{KOH}$, resulted in the formation of product A. The secondary valency of $\ce{Fe}$ in the product A ...

15 30 50 per page