All Questions

0
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0answers
3 views

Natural deodorant with magnesium powder turning neon yellow!

I am not a chemist but need some help. I make organic deodorant with magnesium instead of baking soda for folks with sensitive skin. But the deodorant often turns bright, neon yellow when it gets ...
2
votes
1answer
41 views

What exactly color does ozone gas have?

This answer to a now closed question says that ozone gas has a "slight blue" color. But there are lots of blue colors: sky blue, ultramarine, phthalo blue, many others — what is closer to the color of ...
0
votes
0answers
13 views

Why does carbon steel remove garlic odor from fingers?

What reaction is responsible for the well-known ability of carbon steel implements (e.g. a chef's knife, or cleaver), being used to remove garlic odor from one's fingers after chopping/slicing it? ...
0
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0answers
27 views

Why is C-O bond that is in picture breaking, other C-O where I have shown Red arrow can also break?

the bond that's breaking has a partial double bond character due to conjugation, and it must be strong, why will it break? Why the C-O bond on the right(shown by a red arrow) can't break, it weaker ...
0
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0answers
19 views

Iodoform on acetone gives one product?

During the Iodoform reaction of acetone why does only one alpha Carbon get halogenated and not both??
-1
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0answers
17 views

Haloalkanes and Haloarenes

What are the product that we get on reaction of ethylene glycol with excess HI? Confused that both OH will go substitution or elimination then addition
2
votes
0answers
19 views

Are the dsp3 hybrid orbitals degenerate?

I learned in general chemistry that hybridization of n orbitals produces n hybrid orbitals with the same energy (degenerate). However, in Housecroft and Sharpe inorganic chemistry, I read the ...
0
votes
0answers
16 views

Which of the following sustituents has the highest priority according to sequence rule? [on hold]

A) - CH(OCH3)2 B) - COCH3 I aswered it b ,but my teacher says its a. I can't understand why !! I am sure it is b!! Please, explain for me.
0
votes
0answers
16 views

Finding all Chemical Reactions Given Products and Reactants

given only the products and reactants, is it possible to find all possible chemical reactions involving those species? I'll use the example that user Floatzel98 had in their original post before ...
-1
votes
1answer
29 views

Why is the H2O molecule an antigen despite its tiny size and simplicity?

I just saw a news article about a woman with Aquagenic Urticaria which basically means she produces antibodies against H2O molecules which causes very bad symptoms if she touches or drinks water. We'...
0
votes
1answer
14 views

Copper powder amount dissoved in water [on hold]

How much copper powder dispersed into 2 liters of water will result in a 10 ppm concentration? I am not a chemist.
-1
votes
0answers
15 views

Ethers hydroysos in acidic medium [on hold]

Plz provide the detailed to how to hydrlyse this ester.
2
votes
1answer
21 views

How to quickly diffuse a dye through still water

I'm doing an engineering experiment soon and would like to be able to quickly dye water. The water is still (i.e. not moving) and I would prefer not to physically disturb the water as best I can. ...
1
vote
2answers
20 views

Why neglecting OH Ions from charge balance?

I have a problem, in which the concentration of $\ce{Ca^{2+}}$ ions in water should be related to the partial pressure of $\ce{CO2}$ (assuming the water is an open system and in equilibrium with ...
0
votes
0answers
15 views

How to sythesize gamma-Aminobutyric acid [on hold]

I want to synthesise gamma-Aminobutyric acid (GABA) an amino acid. Can anyone point me towards some clear instructions? Regards,
-1
votes
0answers
11 views

What is the expected trend in the evaporation rate of a mixture of alcohol and essential oil considering both are volatile? [on hold]

A volatile solvent and volatile solute mixture. Can you guide me to some studies that have literature values or that justifies why and whether the evaporation rate of these mixtures will increase or ...
0
votes
2answers
35 views

molecular orbital theory

i read in my textbook that the energy diagram of moleculal orbits is different for atoms nitrogen and below them. my question is which one of the energy diagrams to use in heteronuclear compounds like ...
3
votes
2answers
49 views

Ionic equilibrium between multiple ions

This is a question from IIT-JEE 1993: For the reaction $$\ce{[Ag(CN)2]^- -> Ag^+ + 2CN^-}$$ the equilibrium constant at $\pu{298 K}$ is $\pu{4e-10}$. The silver ion concentration in a ...
-1
votes
1answer
46 views

Stoichiometry of the redox reaction with crystallohydrate

Consider the following balanced equation: $\ce{2 Al(s) + 3 CuCl2 . 2 H2O (aq) → 3 Cu (s) + 2 AlCl3 (aq) + 6 H2O (l)}$ If we began the experiment with 0.99 g of Al, according to the ...
5
votes
0answers
34 views

Effect of spontaneous transmutation of atom in crystal

What happens to a compound when one of its atoms changes via spontaneous nuclear reaction to an atom with very different bonding? For example, suppose an atom of beryllium-7 in a crystal of $\ce{BeF2}$...
17
votes
2answers
548 views

Can a stoichiometric mixture of oxygen and methane exist as a liquid at standard pressure and some (low) temperature?

This answer to the question Pre-mixing cryogenic fuels and using only one fuel tank written by a non-chemist (me) begins with: At STP: LOX's boiling point is 90.19 K Methane's freezing ...
2
votes
0answers
19 views

What is the mechanism of platinum as catalyst poisons on alumina?

I'm wondering if anyone knows by what mechanism is platinum (or other noble metals) catalyst on alumina substrate poisoned? Presently, I'm using platinum on alumina to decompose a hydrogen peroxide / ...
-2
votes
0answers
17 views

Typical proportions of alpha and beta forms of D-glucose in powder?

does anyone know, if you order D-glucose, CAS number 50-99-7, from a source such as Sigma, is this a mixture of the alpha and beta forms and in what sort of proportions that mixture is likely to be? ...
1
vote
0answers
20 views

Why do surfactants lower the surface tension

Everybody knows that detergents, or generally amphiphilic substances, lower the surface tension. Of water, usually. I wonder if that's true of any polar solvent (most likely)? What happens in a ...
-2
votes
0answers
17 views

carbon dioxide concentration of water [on hold]

If you let 10L of distilled water sit at atmospheric pressure, how much $\ce{CO2}$ will it contain in ppm when it reached it equilibrium with the air? (Assuming the air contains 350 PPM of $\ce{CO2}$...
-2
votes
0answers
18 views

Gibbs Free Energy questions [on hold]

https://nimb.ws/avHnge Gibbs Free Energy questions. Please help.
-2
votes
0answers
40 views

How would this reaction go? [on hold]

I feel like this would be a simple reaction, but I'm not sure if there will be secondary things, like unwanted by-products such as HBr, Br2, halogenation of random molecules, etc.
3
votes
0answers
22 views

Chugaev and Selenoxide Elimination giving different products

In class we are going over intramolecular elimination. In this question I will provide two similar reactants that provide a different mixture of products. The chugaev elimination gives a 50/50 ...
2
votes
0answers
15 views

Diazo Coupling reaction with para substituted phenol?

Usually Diazo coupling occurs at para position until the para position is occupied , in which case coupling occurs at ortho position . While solving questions I found in both the cases as shown , ...
0
votes
2answers
66 views

The thermal decomposition of NH4Cl [on hold]

When you heat NH4Cl it decomposes into NH3+ HCl gases. My question is why does it decompose into ammonia and hydrogen chloride gases on the molecular level. Is it because in the N-H-Cl bond, The N-H ...
-4
votes
0answers
12 views

Electro chemistry [on hold]

Find the value of the emf of the following battery at 25 ° C, specifying the polarities of the electrodes and writing the spontaneous global reaction:
0
votes
0answers
34 views

Melting point in hydrocarbons

Checking out the molecular structure and the melting points of various hydrocarbons I concluded: 1)branching increases the melting point of a hydrocarbon molecule 2)symmetry increases the melting ...
-5
votes
0answers
16 views

Hydrocarbon Nomeclature question [on hold]

Give the name of each compound that is shown.
1
vote
0answers
38 views

Antiaromaticity can be explained by Hückel method?

Pentalene is one of the most famous antiaromatic molecules. But I obtained its energy of $\pi$ system as $8\alpha+10.46\beta$ by Hückel method (with a bit complicated but straightforward calculation). ...
0
votes
0answers
38 views

Why does dissolving salts in water raise its surface tension?

I am studying liquids' properties and in my chemistry book there's written that surfactants lower water's surface tension and it explains why, but it doesn't explain why salts raise it.
-1
votes
1answer
25 views

Drug pH and pKa known, is it an acid or a base? [on hold]

I want to answer the question if a drug which is analysed for pH and pKa is ionised or not ionised in a cow stomach with a pH of 6. The drug has a pH of 8,52 and a pKa of 8,78. Since the pH is 8,52 ...
0
votes
0answers
20 views

Replace benzylic hydrogen with NO2 [on hold]

I don't know any method to replace the benzylic hydrogen from, say, toulene. Please suggest one.
1
vote
1answer
16 views

Polyethylene terephtalate Biodegradability

I'm looking into plastics and how they break down. I have learned 3 ways oxo-biodegradation, photodegradation and thermaldegradation. Does anyone know how PET (polyethylene terephtalate) degrades?
-1
votes
0answers
23 views

How would I find the percent yield of this problem? [on hold]

If 4.35 g of phosphoric acid are added to 5.25 g of KOH, what is the percent yield of the reaction if only 3.15 g of potassium phosphate is isolated?
-2
votes
0answers
22 views

Aromaticity when lone pair atoms present [duplicate]

I am having trouble identifying aromatic compounds when elements other than carbon, like oxygen, nitrogen are present. I know the (4n+2) Huckel rule of electrons required for aromatic/anti aromatic ...
0
votes
0answers
32 views

How do I draw a curly arrow diagram for the oxidation of primary alcohol to an aldehyde and subsequently to a carboxylic acid? [duplicate]

I've determined the chemical equations for both the mechanisms, but I'm unable to draw curly arrow diagrams for the two reactions using potassium dichromate as the oxidising reagent. I'm not sure how ...
0
votes
2answers
84 views

A simple question about the direction of a chemical reaction

I do not know much about Chemistry and whatever I knew has become rusty. I have a very simple query. I take a beaker containing pure $\ce{H2SO4}$ solution and immerse a rod of pure $\rm Zn$ into it. ...
0
votes
1answer
18 views

Why do properties of colloidal solution depend only on dispersion medium's physical state? [on hold]

According to a past year JEE question, properties of colloidal solution depends only on dispersion medium's physical state and not on nature of dispersed phase or dispersion medium, or temperature of ...
-1
votes
0answers
23 views

Can I use magnesium sulfate instead of manganese sulfate for winkler titration?

I accidentally bought magnesium sulfate (Epsom salt) instead of manganese sulfate for Winkler titration. (Yes I made the biggest mistake ever!!) Is there a way I could use Epsom salt instead of ...
2
votes
0answers
18 views

Can Weinreb amides be used to form 1,3 dicarbonyl compounds?

Weinreb amides are useful in reducing acid chlorides (and esters) to form ketones due to the fact that the more reactive keto group is unmasked only after treatment with acid and water, which destroys ...
1
vote
0answers
21 views

Deuteration of following enone - mechanism?

What happens when the above compound is subjected to DCl in MeOD? As a result of tautomerism, I'd expect at least 7H atoms, two alpha to carbonyl carbon (right side), and five at gamma position (two ...
-1
votes
0answers
14 views

How to deal with coordinate bonds while dealing with formal charges?

When we calculate the formal charge of an atom in a molecule we consider the non-bonding pair as 2 electrons and any covalent bond as 1 electron. Ok then what about dative bonds,how many electrons do ...
0
votes
0answers
27 views

What can sulfate refer to? [on hold]

What can sulfate refer to? So far, I've got these senses: A sulfate is an anion - a single charged $\text{SO}_4^{2−}$ sulfate unit. Sulfates can mean a class of chemical compounds, such as sulfate ...
1
vote
0answers
9 views

How to define the reduced mass for estimating Kinetic Isotope Effects

I am trying to think about radical reactions using zero-point energies (from the harmonic oscillator model). I have read that substitution of a bond with isotopes can alter the rate of a reaction. ...
2
votes
0answers
22 views

Emergence of Lognormal distribution for the concentration of chemical compounds

I'm currently reviewing the literature about lognormal distributions describing/approximating the variability of a given chemical compound across different cells/ samples etc etc. The main argument ...

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