All Questions

-1
votes
1answer
26 views

Real gas equation at high molar volume

How would the van der Waals equation of state look like when molar volume of gas is high? Does high molar volume correspond to low pressure? My textbook says that A real gas behaves similar to an ...
-1
votes
0answers
18 views

Why does NO prefer oxidation at lower temperature to give NO2 [closed]

Oxidation of compound at higher temperature is favorable condition but NO prefer oxidation at lower temperature to give NO2
-1
votes
1answer
28 views

Which solution has higher boiling point?

Between a 2%(w/v) aqueous solution of NaCl and RbCl, which will have a higher boiling point. Here there are two competing factors. First there's the fact that NaCl has a higher concentration. So it's ...
-1
votes
2answers
53 views

Questions on Neutral oxides

Neutral oxides, are non metal oxides which are neither acidic nor basic. I have noticed a pattern for neutral oxides which I am unsure actually holds true. $\ce{CO}$, $\ce{H2O}$, $\ce{NO}$ and $\ce{...
0
votes
1answer
35 views

What is the balanced equation of BH3/THF with an amide to form an amine? [closed]

I am doing a green chemistry project as an undergraduate and need the balanced equation to complete the calculations. I cannot find the right information online so any help would be greatly ...
4
votes
1answer
61 views

C4v point group complexes and the group orbitals (MO Theory)

Out of curiosity, what would the group orbitals be like in a C4v complex (square planar complexes or octahedral complexes with 5 identical ligands and 1 other) look like? I get a irreducible ...
0
votes
0answers
35 views

Benzocaine base to HCl [closed]

how would you change freebase benzo to the hydrochloride salt? I got some online and did not notice it was freebase, now I'm stuck and cannot use it. I tried dissolving in acetone and adding HCl but ...
-2
votes
0answers
17 views

Friedal craft of carboxyl group [closed]

Carboxylic acids do not undergo friedal craft because They are deactivating The catalyst aluminium chloride(Lewis acid) bonds to carboxyl group. Why the Lewis acid bonds to an acidic group and can ...
-1
votes
0answers
16 views

Base use in aldol [closed]

Why do we use a base in this type of condensation and is there a compound that gives cannizzaro reaction while having alpha hydrogen ?
1
vote
1answer
73 views

Work done in an irreversible process

I was given a problem to identify whether the given statement is true or false. And the statement was: "Consider an ideal gas which is expanded from $(P_{1},V_{1},T_{1})$ to $(P_{2},V_{2},T_{2}).$ ...
0
votes
0answers
12 views

Reduction of which oxide will be easier according to Ellingham diagram in terms of ∆g [closed]

According to Ellingham diagram reduction of which oxide will be easier in terms of ∆G
0
votes
0answers
20 views

Monitoring amino acid esterification

I am trying to monitor the esterification of a non UV active amino acid.I used thionyl chloride and Methanol as reagents. As amino group is unprotected, Ninhydrin should give positive result for both ...
-2
votes
1answer
27 views

How do I get a 20% ratio of sodium bisulfate with 1 gallon water? [closed]

How many lbs do I add to 1 gallon of water to get a 20% sodium bisulfate ratio? I am in the middle of anodizing some aluminum.... I just threw the whole 3 lbs in... hopefully it works... I ended up ...
0
votes
0answers
31 views

Melting sticky hands? [closed]

If I were to, say, order 10,000 sticky hands in bulk, melt them down, and then pour the resulting goo into a large (nonstick) mold of a giant Ultimate Sticky Hand, would the giant hand be sticky? I'm ...
-1
votes
0answers
29 views

Calculate the value of equilibrium constant K [closed]

Calculate K for the following reaction: $$\ce{2A <=> 3D}$$ given the following $K$ values: $$ \begin{align} \ce{A &<=> 1/2 B + C} &K_1 &= 82.36 \\ \ce{3 D &&...
-3
votes
0answers
22 views

What is azeotropic mixture and how components are separated from it . And factors of formations of azeotropic mixture [closed]

What is azeotropic mixture and how components are separated from it . And factors of formations of azeotropic mixture
-2
votes
0answers
27 views

organic chemistry problems [closed]

how many of nitrogen(N) are present in a 2.0l aliquot of a 3M ca(no3)2 solution? 13mg of vitamin c was detected in a test . 200mg of ground tablets were used in the preparation. if the weight of one ...
1
vote
1answer
31 views

Is there a difference between a chelate ligand and a polydentate ligand?

I'm confused because my lecture notes state that chelate ligands are a subset of polydentate ligands.
1
vote
1answer
73 views

Determine surface area of heat exchange tube

A heat exchanger is used to cool down a stream of $\pu{20 kg s-1}$ of water from $\pu{80 °C}$ to $\pu{60 °C}$. The cooling water enters at a rate of $\pu{12 kg s-1}$ and $\ce{20 °C}$. The overall heat ...
0
votes
0answers
24 views

What is the difference between exhaust cement to furnace cement

Exhaust cement and furnace cement appears to have,more all less,similar properties.Them both based on sodium silicates which resist high temperatures. I assume that they are not made exactly the same,...
0
votes
0answers
29 views

Why zinc sulphate solubility is higher in ethylene glycol than water?

I'm trying to find saturation point for dissolved zinc sulphate in water and ethylene glycol. Based on my knowledge, water is more polar than ethylene glycol as reflected in its higher dielectric ...
-1
votes
0answers
25 views

The anode and the cathode in an electrochemical cell [duplicate]

In an answer on this website, Why is it important to use a salt bridge in a voltaic cell? Can a wire be used?, the person says that that the Zinc electrode is the anode, how come ? In my school notes, ...
0
votes
1answer
47 views

Why can't an electrochemical cell be a single cell? [duplicate]

If I put two electrodes of two different metals in 1 solution containing ions for both of the metals and connect these electrodes with a wire, do I still have an electrochemical cell ? Or does it have ...
0
votes
1answer
38 views

MO diagram for pentaamminechlorocobalt(III)?

I was considering the MO diagram for [Co(NH3)5Cl]2+, and figured it’d be as follows: 5 sigma interactions from the NH3 ligands; by reducing a reducible representation one obtains 2A1 + B1 + E 2 pi ...
0
votes
0answers
23 views

Acidity of alcohols [closed]

The acidic nature is due to the polarity of the OH bond Groups like CH3,C2H5 increase the electron density on oxygen, decreasing the polarity and hence decreasing the acidic nature. My doubt is if ...
0
votes
1answer
56 views

Nuclear equations for the decay of radon-222 to lead-206 [closed]

I have to answer this on my worksheet. I understand nuclear chemistry equations a bit, as well as the process of alpha decay and somewhat about what happens when an atom changes its number of protons ...
-2
votes
0answers
16 views

Bachelor thesis examples online [closed]

I was trying to search online for some examples of undergrad thesis in either chemistry or biochemistry, but could not find very much. I realize it is much more common to publish for master students ...
5
votes
0answers
46 views

Ab initio MD simulations in VASP

I'm not sure if this is an appropriate question for Chemistry.SE, but I'm taking a stab. I'm running ab initio MD calculations in VASP and I'm trying to optimize different input tags. On the VASP ...
-1
votes
0answers
34 views

Why ammonium hydroxide precipitates metal salts?

When I was going through the chapter on pnicotgens, I got to know that ammonia acts as a Lewis base and it dissociates in water giving out hydroxide ion and the further hydroxide of ammonia, which we ...
15
votes
4answers
3k views

How could the ideal gas law be discovered from experiments on real gases?

The gas laws, namely Boyle's Law, Charles' Law, Avogadro's Law and Gay-Lussac's Law, are all experimental laws. Combining these laws, we get the ideal gas law $pV=nRT$. Also, "real life" gases do not ...
0
votes
0answers
25 views

Dilute 20 drums of caustic soda solution 50% with 60 drums water to get caustic soda 10% solution [closed]

i want to buy caustic soda 50% solution and then dilute it with water to get 10%. for example; i will buy 20 drums 208 litre per drum and then dilute with 60 drums water to get caustic soda 10%. am i ...
7
votes
1answer
75 views

How do the def2-SV, def2-SV(P), and def2-SVP basis sets differ?

I am trying to calculate the energy of complex molecules with DFT and have a question about the Ahlrichs (Karlsruhe) def2 basis sets. What is the difference between the def2-SV, def2-SV(P), and def2-...
0
votes
0answers
21 views

3D printing of alumina

I want to print a structure of alumina, and the 3D printer that I am using is an extrusion-based printer. So I need your help in knowing that what composition (binders and deflocculant) of alumina ...
0
votes
1answer
40 views

How does increasing temperature reduce the efficiency of solar cells?

I've seen several answers and trying to confirm. 1) Does temperature increase the ground state energy of electrons once they reach the positively doped semiconductor, thus reducing the voltage ...
-1
votes
0answers
21 views

How to safely remove epoxy putty in one piece? [closed]

Recently, I repaired an hole in the exhaust pipe with epoxy putty ("PROPOXY20", the one that came in a stick). The size of the epoxy repair is about 10 cm × 10 cm. I made a mistake, so I would like to ...
0
votes
0answers
25 views

I'd like to ask, how to make permanent ink, that will be invisible when used, but after like 1hr - 3days it will appear (preferably dark color)? [closed]

URGENT.Can someone help me on how to make permanent ink, that will be invisible when used, but after like 2 or 3 days, it will appear (preferably dark colors)? Thank you.
0
votes
2answers
39 views

Determining the formula of zirconium oxide

I am doing the following question (from the 1988 HSC Chemistry paper): In the 19th Century the atomic weight of zirconium (Zr) was known but there was considerable doubt about the formula of ...
0
votes
1answer
19 views

How to apply the Principal of Atom Conservation (POAC) [closed]

27.6 g $\ce{K2CO3}$ was treated by a series of reagents so as to convert all of its carbon to $\ce{K2Zn3(Fe(CN)6)2}$. Calculate the weight of the product. I am asking here is that, why we are ...
1
vote
0answers
12 views

Should I plate cast iron with copper first before nickel plating?

I have some antique handplane lever caps I would like to retore back to their former glory. They are made of nickel plated cast iron. The plating pin holed and flaked in areas, creating rust spots. ...
-1
votes
0answers
27 views

Problems with getting uniform color in a liquid [closed]

I have a dark oil. I pour it into a one gallon container of light mineral oil that is basically colorless. I add and mix until the one gallon container is the exact color I want. Now I pour mixture ...
2
votes
0answers
43 views

Stability of methoxy-methyl and tropylium carbocations

Which is expected to be more stable: methoxy-methyl carbocation $(\ce{CH3-O-CH2+})$ or tropylium $(\ce{C7H7+})$ cation? I think because oxygen would donate its lone pair so there will be complete ...
7
votes
2answers
89 views

What library/program can draw molecules in 3D programmatically?

Molecular graphics software is usually interactive. But I am looking for a library or program that would be able to render a given molecule based on the commands from another program. I would like to ...
1
vote
1answer
37 views

When a piston cylinder system that evolves isothermally and quasistatically is irreversible?

Suppose we have two states: $\ce{A}$ and $\ce{B}$. Considering a quasi-static isothermal process of an ideal gas, (and another condition, that is $T = T_\mathrm{surr}$) that join those states. Then ...
0
votes
1answer
55 views

Solubility of dimethyl ether in aliphatic hydrocarbons

I'm having trouble finding information on the solubility of dimethyl ether in a hydrocarbon like butane, propane, or isobutane. I've read that its soluble in methanol, ethanol, isoproanol, ...
5
votes
4answers
97 views

Where does the potential energy of capillary action come from?

Capillary action is when water pulls itself up a paper towel, glass tube or a tree. It is going up, which results in an increase in potential energy. According to the law of conversation of energy, ...
-1
votes
2answers
49 views

How can I determine the highest boiling point given a list of molecules? [closed]

I know that the highest boiling point has to do with which has the strongest intermolecular force. I also know that the strongest would be ionic, then hydrogen bonding, then dipole-dipole, then london ...
0
votes
1answer
41 views

Does ammonium react with water in an ammonia solution?

In the following equilibrium: $$\ce{NH3 + H2O <=> NH4+ + OH-}$$ Is it possible for the ammonium to simultaneously establish another reaction with water? $$\ce{NH4+ + H2O <=> NH3 + H3O+}$...
-2
votes
0answers
34 views

Can someone help me solve this question? [closed]

Can someone please help me solve this chemistry question? I am stuck. Covalent bonds form when atoms ____ ____a _____ of electrons. How many covalent bonds does water have? ____ What are the answers....
-1
votes
1answer
36 views

why does only barium hexa aluminate gets formed ?why not octa or tetra? [closed]

We are researching on uses of barium hexaaluminate as catalyst. Why does barium react with alumina to get only hexa product , why doesn't it react to form products like barium octa aluminate?
3
votes
1answer
163 views

What does x mean in (1-x)A – xB composite materials, molar ratio, weight ratio or volume fraction?

I've been collecting data about ceramic materials and often I get to see composite materials are described as $(1-x)\ce{A} - x\ce{B}$. I am confused what this $x$ means. And I haven't seen any of the ...

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