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12 views

Why is there no visible reaction when sodium sulfate is added to zinc nitrate?

Why is there no visible reaction when sodium sulfate is added to zinc nitrate? The product is a clear and colorless solution and no precipitate if formed.
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0answers
17 views

Why does mercury(II) nitrate form only when using concentrated nitric acid?

In the reaction between mercury and nitric acid, mercury(II) nitrate only forms when concentrated nitric acid is heated up and added to it, if the acid is dilute, mercury(I) nitrate forms. I ...
0
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0answers
26 views

Example of a chemical bond that occurs by adding a substance? [closed]

It's been ages since I've studied chemistry... and since there is no chemists around me I hope it's ok that I ask this question. I am looking for an example from chemistry where there are two, or more,...
0
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1answer
17 views

How much heat is lost to the calorimeter when hot water is mixed with cold?

If a student adds $\pu{100.00 g}$ of hot water at $\pu{50.00 °C}$ to $\pu{100.00 g}$ of cold water at $\pu{25.00 °C}$ and measures a heat change of $\pu{10707.37 J}$ for the hot water and $\pu{4778.86 ...
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0answers
26 views

Organic "friendly" oxidizers

are there any oxidizers I can use with organic solvents (ethanol, acetone...) that won't make them blow up? I need to dissolve metals in anhydrous organic environment, but I don't really need ...
-1
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0answers
15 views

Meta-arsenous acid (HAsO2) is written as molecular, Why?

I really searched everywhere and to be honest I did not get the question well either, thank you in advance.
0
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1answer
19 views

Why is sodium carbonate a diacidic base?

We know,the acidity of bases is defined by the number of replaceable $\ce{OH-}$ ions,or in case of oxides,it is the number of moles of $\ce{HCl}$ it reacts completely. But we know $\ce{Na2CO3}$ is ...
0
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1answer
27 views

Understanding weak acid-strong base titration

Today I stumbled across a website which defined the titration of weak acid and strong base as the following: "The titration of a weak acid with a strong base involves the direct transfer of ...
1
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0answers
19 views

Consequences of aluminum presence in rust removal electrolysis

I am using electrolysis to clean and remove rust from carbon steel parts. For the anode I use sacrificial carbon steel. For the cathode I use the steel part I am cleaning. The electrolyte is a ...
-1
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0answers
11 views

Osmosis when pressure is low [closed]

In the following question: I know the answer is option B, but why not A.
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0answers
19 views

Isomer only appears in carbon compounds? [closed]

Isomer is a property that appears only in carbon compounds? Is it the property of an optical isomer that appears only when carbon forms a tetrahedral structure? Can other atoms come to the center of ...
-4
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0answers
30 views

Anti-Stokes percent

What are some examples of things that have a highest % of anti-Stokes shifts? Like most emissions is like 95% Stokes, 5% anti-Stokes. What phenomenon have some of the highest percentage of anti-Stokes?...
-1
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0answers
16 views

Reimer tiemann reaction of para nitrophenol

I was having a doubt regarding the Riemer Tiemann reaction on para nitro phenol. What would be the major product since the nitro group has a -R effect on the ortho position? Any links or books or ...
1
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0answers
22 views

Recycling flow if the chemical process of acetylene and hydrocyanic acid

I'm having some issues trying to solve this problem, because the concentration of inert in the recycling flow that I calculated is bigger that the concentration of the inert that is enterying to the ...
2
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1answer
27 views

Which ion has a greater paramagnetic property?

I just recently began studying the Molecular Orbital Theory in Chemistry and I just learnt about the paramagnetic and diamagnetic nature of molecules based on their unfilled and filled orbitals. Now ...
1
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0answers
16 views

Why is the formation of the nitro isomer more favorable under acidic conditions

In the reaction between chloropenataamminecobalt and nitrite either the NO2 or the ONO linkage isomer is formed. This preference seems to be mainly due to the pH of the solution with acidic conditions ...
9
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1answer
178 views

What's the difference between a 'centered' and 'side' double bond on a structural formula?

It's hard to explain since I don't know what you'd call this but here's what I mean: You can see that the oxygen is drawn with two bonds centred on the diagram while the nitrogen has a single centred ...
0
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1answer
43 views

Role of electrolysis and conductivity in electrophoresis

I have a question concerning electrophoresis. I often heard that the buffer is not only important to hold the pH constant, but also to provide ions, in order to have a current. Seems logical. But ...
-1
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0answers
21 views

Slowing down the reaction of Liquid sodium glass with Calcium chloride

I d'like use Calcium chloride as hardener of liquid glass to make fireproof cement. In this way: $\ce{CaCl2 + Na2O(SiO2)_{\mathrm{{n}}}-> 2NaCl + CaO(SiO2)_{\mathrm{n}}}\downarrow$ But reaction ...
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0answers
26 views

Can a hydrate react with an acid differently than the anhydrous substance?

I am interested in $\mathrm{Na}_2\mathrm{S}\cdot3\mathrm{H}_2\mathrm{O}$ reacting with $\mathrm{HCl}$. Does it produce $\mathrm{H_2S}$ at room temperature? More generally can a hydrate of a substance ...
1
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1answer
22 views

Chemical product to restore a rubberized coating that became tacky / sticky?

I have several Dell Latitude E6520 laptops whose the palmrests became tacky / sticky. This problem also concerns other models sharing the same "rubberized" palmrest coating (E6320, E6420, ...
0
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0answers
22 views

Why are HOMO and LUMO energies invariant under spin-flip?

Atomic theory says singlet and triplet energies for the same orbital differ because of exchange interaction. However, molecular orbital (MO) theory describes the energy between the HOMO (highest ...
-1
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0answers
25 views

What are the chemical properties to optimize for drug and what makes the problem difficult? [closed]

I come from a computer science background (not chemistry), however, my supervisor told me that my thesis is going to be about doing an application of machine learning-based drug design optimization. ...
-1
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1answer
33 views

Why Na2CO3 is conjugate base

The defintion of conjugate base is the base formed by removing 1 proton from acid. For example if $\ce{H2SO4}$ is acid then it dissociates as $\ce{H+ + HSO4-}$. Now we consider $\ce{NaHCO3}$. If we ...
-1
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0answers
24 views

R/S classification and D/S classification in optical isomers [closed]

I want to know the difference between the D/S classification and the R/S classification of optical isomers.
1
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1answer
34 views

Titration of CH3COONa with HCl and pKa determination from half equivalence point

I am trying to experimentally determine the $\mathrm{p}K_\mathrm{a}$ of acetic acid by titrating sodium acetate with $\ce{HCl}$. The $\mathrm{pH}$ curve starts in the alkaline region (since sodium ...
0
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0answers
23 views

TCP and KCP product

Q: According to me, the kinetic controlled product(KCP) should be While the Temperature controlled product(TCP) is: What should be the answer to this question because no temperature has been ...
1
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0answers
27 views

Are there any pathways that can change a solution to all colors of the rainbow?

The challenge's like this. Suppose you have a beaker containing a liquid of transparent or any color. You add some drops of another liquid and the beaker turns into, say, red after some swishing. You ...
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0answers
13 views

How do I measure concentration of CO2 evolved from a decomposition reaction of a metal carbonate?

Context: I have to design and perform an experiment in school where I have to decompose various metal carbonates and measure the rate of reaction. I realise one way to do it is to measure the ...
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0answers
11 views

How are covalent character and lattice energy determined by the same rules

Fajan's rules give Covalent Character ( C.C.) = k * polarisiblity * polarising power = k * net product of charges * radius of anion * 1/radius of anion. Similarly, Lattice energy ( L.E.) = k * net ...
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0answers
26 views

Can a Cis alkyl epoxide originate from a halohydrin and does the stereochemistry of halohydrin determine Cis/trans isomerism

Does the stereochemistry of a given halohydrin determine the outcome of the epoxide being either cis or trans. for example if (2S,3R)-3-Chloro-2-butanol is subjected to basic conditions is there a ...
2
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0answers
24 views

Changing Variables in Thermodynamics

I have a question about changing variables in the context of thermodynamics, but I suppose this would extend to any set of variables that have defined and nonzero partial derivatives on a given set of ...
0
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1answer
22 views

Physical meaning of enthalpy change when internal pressure Is not constant

My chemistry textbook states the following "general enthalpy" formula for the change in enthalpy when the internal pressure is not constant: $∆H= ∆U + ∆(PV)$ How is the internal pressure ...
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0answers
24 views

Why does a carbanion produced through heterolytic fission have a -1 charge instead of a charge of 0?

Titled below is an except from a paragraph detailing about covalent bond fissions: I am very confused as to why a carbocation and carbanion would get a +1 and -1 charge instead of +1 and 0 in such a ...
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0answers
18 views

What are the possible products of this reaction [closed]

What are the possible products of this reaction, and explain why I couldn’t get the right answer for this question
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0answers
10 views

Anionic surfactants sensitivity to hard water

It is known that anionic surfactants can be sensitive to hard water, as well that the sensitivity decreases according to their headgroup, where carboxylates are the most sensitive, followed by ...
-1
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0answers
33 views

Why can’t we prepare all 15 geometrical isomers of Mabcdef type octahedral complex

He gave that only three in fifteen have been isolated ,why couldn’t we able prepare those additional 12 Geometric isomers? Can we prepare our desired geometric isomer?
-2
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1answer
61 views

Why sodium metabisulphite is not an oxidising agent?

We know that maximum oxidation state of sulphur is +6.Whereas the oxidation state of sulphur in sodium metabisulphite is +3 and +5. Can't these oxidation states reduces a lower oxidation state? If it ...
-1
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0answers
42 views

Is the oxygen atom in an oxime sp2-hybridised?

In JEE Advanced 2021 (a popular competitive exam in india), a question was asked in Chemistry section about hybridization of atoms. The question is as follows: The provisional answer is 8. But, i ...
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0answers
26 views

Ion Flux in nerve cells

Cell membranes separate intracellular and extracellular space, and the membrane is permeable to certain ions depending on the excitation of the nerve cell. The extracellular space contains many ...
-4
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0answers
22 views

Can you please explain the importance of Isomerism? [closed]

I am having a really hard time understanding Isomerism. I just started out with Organic Chemistry 3 weeks ago, I finished Inductive effect, Resonance, Mesomeric, Hyperconjugation, Electromeric effects....
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0answers
39 views

What is the time required? [closed]

The electroosmotic velocity of a solution in a particular capillary is 0.736 mm/s. A 21.9 kV potential is applied across the 57.6 cm long capillary. How long will it take a cation with an ...
2
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1answer
55 views

Can LaCl3, FeCl3 be used as a "Lewis Acid" substitute for AlCl3 in Friedel-Crafts reaction?

AlCl3 is a Lewis acid. In Friedel-Craft reaction, purpose of AlCl3 is to produce electrophile, which later adds to benzene nucleus. This electrophilic aromatic substitution allows the synthesis of ...
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0answers
27 views

Why do ZnO particles clump when mixing it into a cream?

I added ZnO powder to a store-bought moisturizer and mixed them together. The ZnO particles ended up clumping in the moisturizer, where I thought they would stay apart and stick to the moisturizer. I ...
3
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1answer
99 views

Size and maximal power output of a battery of electrochemical reactions

For a battery working and chargeable on electrochemical reaction, how does the size of the battery affect its maximal power output? Specifically, With any chemicals/materials available and current ...
0
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0answers
24 views

What's the chemistry behind making colored a PTFE gasket colored?

There are various classes of PTFE gaskets with different color codes orange, brown, light brown, etc. How do they make PTFE colored? Is it some sort of organic dye or some PTFE complex with metals, ...
0
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0answers
11 views

Organic solvent that won’t attack either PET or butyl rubber?

I am looking for a suitable organic solvent for dissolving dried-on polyurethane adhesive on a substrate of nylon/butyl/polyester. Acetone is ruled out because it attacks polyester (PET) and Toluene ...
3
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2answers
62 views

Acidic strength comparison of squaric acid and rhodizonic acid

These two are dibasic acids with the following structures (squaric acid and rhodizonic acid in order). Empirical evidence proves that squaric acid is more acidic than rhodizonic acid. It is a ...
-4
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0answers
24 views

Does evaporation break the bonds between hydrogen and oxygen? [closed]

After sublimation occurs in ice to create a gas, is the product hydrogen gas + oxygen gas? Or H2O in a gaseous state? Will the molecular bonds break?
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0answers
20 views

How do we actually calculate attraction and repulsion while explains bond length? [closed]

I am a high school student and in my textbook there is a figure given in which two isolated hydrogen atoms approaches each other and we define bond length as the distance between their nuclei at ...

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