# All Questions

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### What are the consequences of Planck's constant being different from the current value ?

Does it have drastic effects in the nature of the physical world ?
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### how to calculate the new value of equilibrium constant after doubling the volume of vessel

The equilibrium concentrations of A and B for the reaction A(g) + 2 B(g)=== C(g) are 3M and 4M respectively.when the volume of vessel is doubled and the equilibrium is allowed to re establish the ...
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### What is de-Broglie's hypothesis?

Was the relation between wavelength and momentum derived or is it just an empirical relation ?
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### Work and entropy

I am not able to conceive why work wouldn't increase the entropy of a system. If i am compressing a ideal gas adiabatically and reversibly, the gas pressure inside would increase,meaning more no of ...
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### Why do Bence-Jones proteins behave differently in urine heat test?

The preliminary test for proteinuria (proteins in urine) is precipitation/turbidity on heat due to denaturation. This turbidity should not disappear when 10% acetic acid is added - to differentiate ...
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### What is the hybridisation of hydrogen in methane?

I am trying to understand hybridisation. In methane carbon has $\mathrm{sp^3}$ hybridisation, but what is the hybridisation of hydrogen? Is it $\mathrm{sp^3}$? If yes then why?
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### Energy gap between 4d and 5f orbitals

As we know 4d orbital initially has lower energy than 5f orbital but upon filling 1 electron into 4d orbital its energy generally rises and exceeds the energy of 5f orbital. Why does not after filling ...
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### Crystallography - physical reason for ideal lattice approx

Why can we approximate a lattice as being infinite when we describe it as an ideal crystal? Is there any physical reason or is it just because the number of ions (/atoms) is so huge that we can treat ...
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### How to prevent dripping when using a Pasteur pipette with solvents like diethyl ether?

I'm trying to use a Pasteur pipette for pipetting diethyl ether and regardless of the angle I hold the pipette at, the diethyl ether will automatically start dispensing itself (I am unsure of what ...
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### Why the intensity vs. frequency graph initially increases for black-body radiation?

Max Planck had said that $E = n h \nu$ in his quantum theory. Then according to it, as the frequency of the light emitted increases, so the light's intensity should decrease. But it is not in the ...
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### How to breakdown wax, preferably beeswax

I have a project that I'm working on at the moment, but I'm stuck on this detail. I'd like to find out what can I supplement beeswax with that is organic, non toxic, and safe if accidentally consumed, ...
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### Small spills not dealt with [on hold]

What residues are left when drops of acid are left to evaporate on a bench? I wish to use bleach on concrete items. If I leave them to dry, is there any undesirable residue?
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### Reaction control on molecular level

Imagine I have a bottle with a random quantity of molecular hydrogen, and can apply exactly enough energy to break only one molecule of hydrogen. Is the reaction going to occur or the energy would be ...
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### Will lugols Iodine solution react with L-Phenylalanine?

And is possible to increase the iodine/potassium iodate concentration in the lugols by evaporating off the water? Hi, I'm making a moisturizer for my sister who has skin problems. Some potential ...
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### What makes DNA/Protein in a gel run in straight lines?

In a gel electrophoresis, let's assume an SDS-PAGE, I understand that the sample is loaded on a cuboidal well and the electric field is straight downward. It is easy to assume that the sample is going ...
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### Gel electrophoresis separates proteins on the basis of what property?

In SDS-PAGE for separation of proteins, SDS is an ionic detergent that coats the unfolded protein to mask its native charge and give at a uniform charge to length ratio. Since the length of the ...
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### Diffusion-controlled reactions, activation-controlled reactions and rate equation

I am confused as to where the rate equation can be applied and where not to be applied. https://en.wikipedia.org/wiki/Rate_equation In diffusion-controlled reactions from what I understand reaction ...
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### How to find the atomic mass of an element when the mass of the particular element is given? [on hold]

I would like know how to find the atomic mass of an element when the mass of the particular element is given. An example of such question would be An atom of an element weighs $5\times10^{-23}$. ...
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### Reactivity Towards Electrophilic Substitution [duplicate]

How do you decided which compound is the most or less reactive towards electrophilic substitution? For example, if the compounds are benzene, ethyl benzene, 2-phenylpropane and 2-methyl-2-...
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### Help needed with this numerical [on hold]

If 2.3 mol of a gas occupies 50.5 ml how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?
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### Memorizing inorganic equations [on hold]

I couldn't figure out an efficient way of recalling inorganic balanced chemical equations. When it comes to an exam, I feel that I always tend to write the half ionic equations and get the balanced ...
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### Methyl-alpha-d-lactopyranoside synthesis [on hold]

I found in my book information about methyl α-d-glucopyranoside synthesis, but now I must describe methyl-alpha-d-lactopyranoside. Sorry for my stupid question, but I couldn't find any examples of ...
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### How can we explain the exceptions in the periodic table? [duplicate]

I notice that chromium, molybdenum, copper, silver, gold, and roentgenium have an incomplete $s$ sub-shell and I'm usually told that it's because of the energy levels. However, I know there's got to ...
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### Why are these materials like gallium arsenide, gallium phosphide, aluminium gallium arsenide etc used in Light Emitting diodes?

Indium gallium nitride (InGaN): blue, green and ultraviolet high-brightness LEDs Aluminum gallium indium phosphide (AlGaInP): yellow, orange and red high-brightness LEDs Aluminum gallium arsenide (...
19 views

### corrosion equation of steel 304 in sulphuric acid [on hold]

I am a pre-university student. I would like to know what happen steel react with sulphuric acid. From what i know the reaction of pure iron with sulphuric acid is: Fe + H2SO4 --> FeSO4 + H2 I suppose ...
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### Acidic Strength of Nitrobenzoic Acid

The Correct acidic strength of the following : But according to me pK value of 2-nitro benzoic acid should be more than 4-nitro benzoic acid because NO2 might have H-bonding with COOH as NO2 have ...
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### Can a more electropositive metal replaced by a less electropositive one?

I read from this reference that rubidium is extracted by reduction of its chloride with calcium or sodium. How is it possible?. Their electronegativities are much higher than rubidium. I think ...
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### Are there stronger oxidation agent than fluorine gas?

Are there stronger oxidation agent than fluorine gas, so it could oxidize fluoride to fluorine? Also, in case of oxygen, fluorine gas can oxidize oxygen gas to the exotic dioxygenyl ion. Can anything ...
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### How to make .wrl files from Spartan output?

I am trying to make some 3D printed models of molecular orbitals. I tried using jmol to export the .wrl files, however, when I import the .spardir or any other kind of file exported from Spartan, I ...
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### Heat of reaction at constant pressure and constant volume [on hold]

When 1mole of liquid benzene is completely burned in oxygen to form liquid water and carbon dioxide gas change in enthalpy is -3264.58kj at 298k calculate the enthalpy of reaction at constant volume ...
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### Why acetaldehyde and acetone have almost equal water solubility? [on hold]

Given that boiling point of acetaldehyde and acetone are different due to H-bonding, why doesn't H-bond affect the solubility of these compounds in water?
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### Can I remove sugar from soda using microfiltration (using gelatin)

Basically will the sugar molecules be left behind in the filtration process I'm looking into this method for naturally and safely flavoring vape juice (sugar would burn on the coils) if not do you ...
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### chemical kinetics of TG analaysis [on hold]

Can some one help me figure out how to determine TG analysis Excel data for calculation activation energy?
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### Flynn-Wall-Ozawa (FWO) Method“ and ”Kissinger-Akahira-Sunose (KAS) Method [on hold]

Can any one tell me how to plot graph between 1/T and ln(β/T²) using KAS and FWO method in Microsoft Excel
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### Low solubility of propanal compared to propanol, propanone, propanoic acid and methyl ethanoate

I found on the internet that propanol, propanone, propanoic acid and methyl ethanoate where all completely soluble in water at room temperature. (23 degrees Celsius) But I found that propanal was, ...
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### How to stop ( Or slow down ) Diffusion Of A Gas [on hold]

I want to know how can you stop, or slow down diffusion of a gas out of a system. Argon is the gas that is being use. How can we stop or at least slow down the rate if which the gas escape?
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### How does H's ionization energy relate to its transition energy (Bohr's Model)?

I am currently reviewing some material about orbital energy levels. In my review book there is a short snipet that reads: "The IE of H from its ground state (n=1) is 1312 kj/mol. Because of the ...
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### What are some of the gases that due to their high compressibility are used in hospitals and our homes? [on hold]

What are some of the gases that due to their high compressibility are used in hospitals and our homes ?
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### How many moles of sodium are there in 10mls of 30% sodium chloride?

How many moles of sodium are there in 10mls of 30% sodium chloride? 30% of 10mls is 3g NaCL. There is 3000mg of NaCl and would that be divided by the molecular weight of NaCl or of just Na? I ...
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### Do polarizability and electron delocalization have analogous effects on leaving groups?

With respect to bimolecular substitution and bimolecular elimination reactions, both electron delocalization and polarizability have an analogous effect on a species, making them good leaving groups. ...
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### Why don't we see coupling for chemically equivalent protons? [duplicate]

I know that the peaks of chemically equivalent protons do not split with respect to each other in proton NMR. For example, we do not see coupling between the protons in ethane: the spectrum consists ...