All Questions

Which of the following are true ?? (a) $dH=TdS +VdP$ (b)$ dE=TdS-PdV$ (c)$ dH=-SdT-PdV$ (d)$ dH=dE+PdV$ So in this question, these all quantity are in differential form. I couldn't ...

My mass spectrometry textbook says the following in a section on ionization energy (IE) and charge localization: Molecules with π-bonds have lower IEs than those without, causing the IE of ethene ...

What books are used by the students who have qualified for the national team which participates in the International Chemistry Olympiad ?? Like I know there is a camp / training period before the ...

$\ce{AgNO3 + NaCl}$ gives $\ce{NaNO3 + AgCl}$ but why it's vice versa is not possible. My question is how to predict if a double displacement reaction will occur naturally or not.

Can you complete the chemical equation: Sodium gluconate + sodium bicarbonate --> Does potassium bicarbonate yield the same results?

As part of a bigger project we were given this image. Its a mass spectrum produced in an accelerator with a Boron cathode. It was implanted in diamond. I assume the first peak is just $B^-$ but I have ...

One requires 0.01mole Na2CO3. Mass of Na2CO3 to be taken is.?

I have seen many sources describing the oxidation of alcohols with dichromate in great details; however, none or few gives a satisfactory description and explanation of the oxidation with acidified ...

Hello guys I need some clarification, i know that melanosome transfer to keratinocytes is regulated in part by par-2, and this receptor is activated by trypsin, sligrl and to a lesser degree tryptase. ...

Can anybody help me in calculating the percentage of $\ce{Cu2S}$ and Cu in the ore? I tried using basic mole concept but I must have made a lot of mistakes, because I got my answer as 125% (of Cu2S). ...

On rainy days there is a strong urin smell on trains in Tokyo. I suspect this smell comes from ammonia. On Wikipedia I read: Ammonia and ammonium salts are also found in small quantities in ...

Carbon steel is iron containing some carbon in various forms of iron carbide. When it rusts (oxidises), the iron becomes part of all kinds of crystalline and amorphous iron oxides and hydroxides, ...

I'm looking for the scientific methods for water quality tests. Unfortunately, the labs are not really specific what there are really doing. And I'm looking for the full spectrum of tests; metallic, ...

if we want to determine the quantity of zinc in an insulin formulation, we make standard solutions for the measurements and we also have the physical samples. In standard solutions it contains water, ...

I have a school group project to do and we want to be able to power an engine or a generator with water. We have some research and information on the project but we feel like theres some details that ...

What do the letters Y, Q, P and N mean in three-letter combinations involving DNA and/or RNA? I know, of course, about the bases A, C, G, T and U but..... Especially in articles (and forensic tv ...

I'm not sure how the concept and math work on this problem. Can someone show me how you can get the answer, both conceptually and using math?

Does solvolysis possible on unsaturated compound? If yes then how can we explain the following Kh/Kd data.

Are there any soluble compounds capable of absorbing radio-frequency or long microwave radio-frequency electromagnetic radiation? I have noted that metals are often used to absorb these signals, but ...

In acid-catalyzed hydrolysis, the hydronium ion is clearly reformed; however, in the base-catalyzed hydrolysis, an alcohol is formed as a by-product, but the strong base isn't reformed. Is it a ...

I am looking for true information about this video. The man in the video says that 5-MeO is synthesised from Melatonin in the human body. He also says that spending a week in a dark room will ...

A sample containing only $\ce{CaCO3}$ and $\ce{MgCO3}$ is ignited to $\ce{CaO}$ and $\ce{MgO}$. The mixture of oxides produced weight exactly half as much as the original sample. Calculate the ...

As there is no ring expansion I'm assuming that a carbocation should not form at ester carbon as it leads to ring expansion. But is there any an exception to it? Also the hint provided along with this ...

How can we distinguish between 1°, 2° and 3° alcohol by the means of turbidity ?

We were told that the cause for magnetism is the motion of electrons on an atomic scale which create magnetic fields. However I also know that moving charges produce electric currents. So my ...

I know that the $\mathrm{d}_{z^2}$ orbitals are named as a result from the conversion of the angular component of the hydrogen-like wave function in terms of Cartesian coordinates, but how come we ...

I have access to a large quantity of salvaged timber which was used in an industrial process of paint (yellow) production. The wood was arranged vertically in barrel staves approximately 25’ long ...

Calculate the $\mathrm{pH}$ of a $\pu{1.5e–11 M}$ solution of $\ce{HCl}.$ How is the $\mathrm{pH}~7?$

Can salt get dissolved in isopropyl alcohol, In order to make the liquid dry out faster and make some quick salt crystals?

Could anyone explain me why there is no angle change in $\ce{BF3}$ because of back bonding like in substances $\ce{H3BO3},$ $\ce{N(GeH3)3}$ etc.?

The constant measurement of concentration is required to find the rate law of a certain reaction. In an integrated rate law, concentrations are measured as a function of time. How do you measure the ...

although nitrogen and phosphorus belongs to the same family, yet $\ce{NH3}$ and $\ce{PH3}$ differ from each other in their reaction with $\ce{CuSO4}$ or $\ce{AgNO3}$. $\ce{PH3}$ acts as reducing agent ...

How many dipeptides are possible by the reaction of glycine and alanine? Glycine has no chiral centre. Alanine has one chiral centre. The products are alanylglycine and glycinylalanine (I not sure ...

I’m really stuck on this problem. This involves dissolving Borax: $$\ce{Na2B4O7•10H2O(s)<=>2Na^+(aq) + B4O7^2-(aq) + 10H2O}$$ $$\begin{align}\Delta H&=\pu{109 kJ/mol} \\ \Delta S&= \pu{...

When sodium nitrate ($\ce{NaNO3}$) dissolves in water at room temperature, the solution cools down. $\Delta H$ is positive because heat flows into the system during the process. I thought though, ...

I need help figuring how to solve this problem hydrated compound

Ok, I've got a strange question for you guys/gals. Forgive my ignorance on the subject but that is why I am here. Is there anyway to combine hydrochloric acid or another chemical with a culinary oil (...

I had a question about 4d. I explained that a few gas particles would change phase into liquid and that particles in liquid phase do not increase the pressure so the pressure will decrease. Is my ...

I'd like to bring down these impurities <0.1ppm (most concerned in the order of Al>As>Cd). For As I guess I could oxidate my Mg sample (by calculating its carbonate salt?) and then dissolve & ...

Let's say you produce biocrude oil in a wood gasifier, and you want to upgrade the biocrude so that it can be used as a lubricant oil. What would you need to do?

for exothermic (deltaH < 0), use equation delta H = -q/n. Then what is the sign of q, is q always positive?

If I showed you a compound's chemical structure will you be able to tell if it can be used as an explosive or we can only know that by conducting chemical experiments?

According to the Wikipedia article for Chalcopyrite it has a formula of: $\ce{CuFeS2}$ and a unit cell of: But from the unit cell it has 13 Copper, 10 Iron and 8 Sulphur. This doesn't match with the ...

Sir all the 4 opposition's are contain 2 same group or atom at the same side of carbon . While geometrical isomerism tells that it must be opposite .

How to calculate numbers of C6H12O6 which is dehydrated to form one molecule of amylose (Given that molar mass of glucose = 180) The question is not complete. But I want to know method to calculate ...

Water and $\ce{N2}$ is mixed together in a container, dissolved amount of $\ce{N2}$ is negligible (the container is lid by a piston). Initially, total pressure ($\ce{N2}$ + water) inside container ...

During oxymercuration and demercuration we use $\ce{Hg(OAc)2}$. But why we can't use $\ce{HCOO-}$ instead of $\ce{CH3COO-}$?

According to Wikipedia all of the alkali metals, as well as $\ce{Ca, Sr, Ba, Eu,}$ and $\ce{Yb}$ (also $\ce{Mg}$ using an electrolytic process[4]), dissolve in ammonia to give the characteristic blue ...

I have read that Polonium is the only metal that crystallizes forming SCC. I searched for a concrete explanation but all they were saying is the stability of Polonium at STP. I can't really comprehend ...

Given moles of H2 = 3 mol, moles of N2 = 9 mol for equation, 3H2 + N2 --> 2NH3, and the container containing both of them has 3L of volume after Equilibrium NH3 gives 50% mole fraction(Means that ...