All Questions

-1
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0answers
2 views

sodium gluconate + sodium bicarbonate =?

Can you complete the chemical equation: Sodium gluconate + sodium bicarbonate --> Does potassium bicarbonate yield the same results?
0
votes
0answers
5 views

Why aspirin dose is reduced in gastric achlorydia?

Aspirin remains in unionised form in acidic $pH$ but this unionised form is a diffusible form which is helpful in absorption across lipid membrane. My reasoning almost tries to contradict the ...
0
votes
0answers
9 views

I need to identify the peaks in this boron mass spectrum

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 ...
-1
votes
0answers
6 views

One requires 0.01 mole of Na2CO3. Mass of Na2CO3. 10H2O to be taken is? [on hold]

One requires 0.01mole Na2CO3. Mass of Na2CO3 to be taken is.?
0
votes
0answers
9 views

Chemical equation for oxidation of primary alcohol with acidified potassium permanganate

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 ...
0
votes
0answers
10 views

Does N-linked glycoslation inhibition increase or decrease par-2 recepto aar activity

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. ...
0
votes
0answers
20 views

The roasting of 100g of Copper ore yielded 71.8g pure copper. The ore is composed of of Cu2S and CuS, with 4.5% inert impurity

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). ...
2
votes
0answers
13 views

Can air conditioning cause urin smell?

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 ...
1
vote
0answers
12 views

What happens to the carbon in carbon steel when it rusts?

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, ...
-1
votes
0answers
11 views

What are the scientific methods for water quality measurements

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, ...
0
votes
0answers
7 views

Positive or negative error using FAAS

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, ...
-1
votes
0answers
21 views

How do you use water as fuel for a generator

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 ...
2
votes
1answer
24 views

What do GGN, AAP, TCN, CAP, CCN, TGQ, etc. mean in DNA analysis?

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 ...
-2
votes
0answers
16 views

Acid/Base Indicator

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?
-2
votes
0answers
14 views

Regarding deuterium isotopic effect on solvooysis

Does solvolysis possible on unsaturated compound? If yes then how can we explain the following Kh/Kd data.
0
votes
1answer
20 views

Soluble compounds to absorb radio-frequency electromagnetic radiation

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 ...
1
vote
0answers
16 views

Why isn't the base reformed in base-catalyzed hydrolysis of esters?

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 ...
-4
votes
0answers
32 views

5-MeO from Melatonin in the body? [on hold]

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 ...
-4
votes
0answers
8 views

percentage composition of a mixture [on hold]

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 ...
-1
votes
2answers
38 views

Reduction of ester in presence of ketone group

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 ...
-4
votes
0answers
20 views

How can you distinguish between 1°, 2° and 3° alcohol by the means of turbidity? [on hold]

How can we distinguish between 1°, 2° and 3° alcohol by the means of turbidity ?
-1
votes
0answers
35 views

Why aren't we zapped on touching a magnet? [on hold]

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 ...
1
vote
1answer
63 views

Why is there a z² label for d orbitals, but no x² and y² labels with corresponding shapes?

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 ...
-2
votes
0answers
13 views

Sulfuric Acid danger [on hold]

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 ...
-2
votes
1answer
21 views

Calculating the pH of Strong Acid Solutions

Calculate the $\mathrm{pH}$ of a $\pu{1.5e–11 M}$ solution of $\ce{HCl}.$ How is the $\mathrm{pH}~7?$
-2
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0answers
14 views

Dissolving salt in alcohol

Can salt get dissolved in isopropyl alcohol, In order to make the liquid dry out faster and make some quick salt crystals?
-4
votes
0answers
25 views

Why there is no angle change observed in boron trifluoride (due to back bonding)?

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.?
0
votes
0answers
17 views

Measurement of concentration during a given reaction to determine rate laws [on hold]

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 ...
0
votes
0answers
26 views

NH3 and PH3 differ from each other in their reaction with CuSO4 or AgNO3. why?

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 ...
0
votes
1answer
37 views

How many dipeptides are possible by the reaction of glycine and alanine?

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 ...
0
votes
0answers
41 views

Finding the temperature at which the system reaches equilibrium

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{...
-1
votes
2answers
47 views

What are the system and surroundings when dissolving sodium nitrate in water?

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, ...
-5
votes
0answers
20 views

Hydrated compounds [on hold]

I need help figuring how to solve this problem hydrated compound
0
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0answers
40 views

Hydrolyzing Oils? [on hold]

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 (...
-3
votes
0answers
31 views

Ap chemistry question 2019 gasses

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 ...
-1
votes
1answer
22 views

What is the most convenient way to purify Mg from Al>As>Cd?

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 & ...
-1
votes
0answers
10 views

Upgrading Biocrude Oil [on hold]

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?
-2
votes
0answers
11 views

Question about delta H = -q/n [on hold]

for exothermic (deltaH < 0), use equation delta H = -q/n. Then what is the sign of q, is q always positive?
0
votes
1answer
48 views

Can we tell if a compound is explosive by just looking at its chemical structure?

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?
0
votes
1answer
9 views

Understanding the unit cell of Chalcopyrite vs its formula

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 ...
-4
votes
0answers
24 views

Which of the following can show geometrical isomerism? [on hold]

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 .
-1
votes
0answers
7 views

calculation of numbers of C6H12O6 dehydrating to form one molecule of amylose [on hold]

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 ...
-2
votes
0answers
35 views

How to calculate Water and N2 is mixed together [on hold]

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 ...
-2
votes
0answers
17 views

In OMDM (oxymercuration and demercuration) why we don't use formate instead of actete?

During oxymercuration and demercuration we use $\ce{Hg(OAc)2}$. But why we can't use $\ce{HCOO-}$ instead of $\ce{CH3COO-}$?
0
votes
1answer
45 views

Would dissolving Mg in NH3 help me purify Mg from all elements other than Li, Na, K, Rb, Cs, Fr, Ca, Sr, Ba, Eu and Yb? [on hold]

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 ...
0
votes
1answer
60 views

Why is Polonium the only metal to crystallize forming Simple Cubic Cell?

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 ...
-1
votes
0answers
18 views

how to calcuate this Equilibrium Calculation question?

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 ...
-2
votes
1answer
22 views

Which statement is correct about cellulose and amylose? [on hold]

Choice A : Cellulose is more stable than Amylose Choice B : Amylose is more stable than cellulose Choice C : Cellulose have helical structure while amylose does not Choice D : Amylose have helical ...
0
votes
0answers
20 views

Oxidation of Hexaaquachrom (II) with air

I had the reaction: $$\ce{Cr(H2O)6^3+ -> Cr(H2O)6^2+}$$ using $\ce{Zn}$ as a reducing agent. the colour turning from green to blue and I know that with contact with air the solution becomes ...
-2
votes
0answers
7 views

electrochemical measurment [on hold]

what is the problem behind the shift in my curves (current density versus potential), it did not start from 0 it starts from -4 or -6 as initial potentials I want to know exactly the problem behind ...

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