All Questions

Filter by
Sorted by
Tagged with
1
vote
1answer
52 views

Does the explosion of TNT include oxidation?

This comment below the question Rocket explosion compared to kT of TNT; has one ever knocked something over at a distance? suggests that ...TNT includes it's own oxidizer... Explosion isn't the ...
-1
votes
0answers
11 views

DNA Codons Amino Acids Cryptography [on hold]

I came across this cool cryptography tool https://www.dcode.fr/codons-genetic-code that uses biology and/or chemistry to encode a string. It's used in cryptic hunts in interschools I attend. I ...
-1
votes
0answers
7 views

rate of reaction of the following reaction is 1.5 mol lit-1 sec-1 we have to find the consumption of reactants and formayion of product? [on hold]

I cannot find the consumption of reactants and formation of product please answer my question?
-1
votes
0answers
8 views

Vrms, Vmps, Vavg of a gas if singly present and if present in a mixture [on hold]

Why is the ratio of Vrms, Vmps, Vavg of for eg CO2 different i.e. 1:1:1 when it is present singly in the container whereas √3:√..... while being present in a mixture?
-1
votes
0answers
20 views

Which is more acidic in nature [on hold]

Please explain this question. How to solve other problems related this question.
0
votes
0answers
49 views

Gibbs free energy of phosphorus pentachloride decomposition reaction

The equilibrium constant at $\pu{227 °C}$ for the equation $$\ce{PCl5(g) <=> PCl3(g) + Cl2(g)}$$ is $K_p = \pu{4.50E3 bar}.$ Calculate the value of $Δ_\mathrm{rxn}G^\circ$ at $\pu{227 ...
-1
votes
0answers
18 views

Dilutions - finding original concentration [on hold]

How would you go about this question? I am confused about where to start in terms of calculating the original concentration of glucose.
18
votes
3answers
1k views

How do Precipitation Reactions behave in the Absence of Gravity?

How do precipitation reactions behave in the absence of gravity, say on the International Space Station (ISS)? I have seen water taking the shape of a sphere and not that of the container in space due ...
-2
votes
0answers
24 views

Constructing a π-system given a molecular formula

Is there a simple way to construct a π-bond system (the molecular bond diagram but solely for π-bonds) for a polyatomic molecule solely being provided a molecular formula (i.e. benzene $\ce{C6H6})?$
0
votes
2answers
57 views

Why do significant figure rules contradict each other? [duplicate]

So I came across a problem in my chemistry textbook that brought up another question. The problem had to do with calculating the mass% composition of chlorine in a certain molecule. So to go about ...
-1
votes
1answer
22 views

How to find osmolarity of a solution contatining salt and glucose?

What is the osmolarity of a solution that contains $4.00\%$ (m/v) $\ce{NaCl}$ $(M = \pu{58.44 g mol-1})$ and $3.00\%$ (m/v) glucose $(M = \pu{180.18 g mol-1})?$ I know you have to convert percentages ...
2
votes
0answers
25 views

Will disodium EDTA effectively destroy Tollens' reagent?

As I understand it, if I mix $\ce{[Ag(NH3)2]NO3}$ and $\ce{Na2EDTA}$ the silver will complex much more strongly with the EDTA than the ammonia, and the hydrogen ions will protonate the ammonia, ...
0
votes
0answers
17 views

Cyclohexane as a Solvent

I was wondering, why is cyclohexane used as a solvent in the synthesis of nylon. Typically, I see it being used to dissolved adipose chloride, but why is this the case?
4
votes
2answers
165 views

Determine structure from NMR

So I've come across this lovely spectrum of a compund where only its chemical formula is given with C5H9NO. I have made the pictures of the spectrum available below. obviously there is some pretty ...
4
votes
1answer
70 views

Cases when Raoult's law is unsolvable

Setup Consider a closed binary mixture of known total molar composition $n_i$, held at volume $V$ and temperature $T$. The equilibrium phase composition is determined by $\mu_i^{vap} = \mu_i^{liq}$. ...
-4
votes
0answers
22 views

Write a balanced chemical equation for: [on hold]

A.) The gas evolution reaction that occurs when a double displacement reaction between aqueous ammonium carbonate and aqueous lithium hydroxide. B.) The complete combustion reaction of heptane ...
-3
votes
0answers
17 views

What factors affect the purity of crystals? [on hold]

more specifically, what factors will affect the purity of copper sulphate crystals obtained via filtration and crystallisation? I need 5 factors.
1
vote
1answer
42 views

What is the stability order of the carbocation and carboanion?

So I came up with examples as below: 1 2 Now I am confused about the +I and -I effect in these structures since to my knowledge it can only be applied when there is a substituent (I might be wrong)...
1
vote
2answers
69 views

Real Gas Behaviour

For a fixed amount of a real gas when a graph of $Z$ vs $P$ was plotted, then at a very high pressure slope was observed to be $\pu{0.01 atm^-1}.$ At the same temperature and pressure if a graph is ...
-2
votes
1answer
85 views

What is so special about Beryllium (Be) and Magnesium (Mg)? [on hold]

I am asking this because after studying periodic properties and trends of elements I have come to an understanding that these two elements ($\ce{Be \& Mg}$) are many of the time exception to the ...
-1
votes
0answers
35 views

How can we compare the order of basicity among the following? [on hold]

My problem is I am unable to compare how basic these compounds are. I tried to compared the resonance effect among these compounds, but as these compounds do not have the property of alternate double ...
6
votes
1answer
103 views

Heat involved in isenthalpic process

Question 28 from [1, p. 4.4]: An ideal gas is expanded irreversibly from $\pu{5 L}$ to $\pu{10 L}$ against a constant external pressure of $\pu{1 bar}.$ The value of heat involved $(q)$ in this ...
-1
votes
0answers
26 views

Help, I don’t know how much silicon dioxide and titanium dioxide to use in my homemade wax [on hold]

I am working on adding a silicon dioxide and titanium dioxide powder to a homemade wax of mine but I don’t know what percentage of my total weight I should use for the si02 and ti02 to be effective.
1
vote
1answer
52 views

Why doesn't hydrazine contain a double bond between two nitrogen atoms? [on hold]

I know that the Lewis structure of hydrazine contains $\mathrm{sp^3}$ hybridized nitrogen atom but on analyzing it's structure I realized there are many bond pair and lone pair repulsions. Instead of ...
2
votes
1answer
24 views

Resonance with different size orbitals

The equilibrium for this reaction is on the left side. Why is this? I thought since the sulphur in molecule X has bigger p-orbitals than the oxygen in molecule Z, resonance would be a less important ...
1
vote
1answer
44 views

Winkler's method in the absence of iodide

I'm currently doing an IB chemistry individual investigation on the effect of adding bleach to water on the water's dissolved oxygen content. I've used Winkler's method for this and I'm just wondering ...
1
vote
1answer
56 views

Number of Stereoisomers for Terpin

Terpin (4-(2-hydroxypropan-2-yl)-1-methylcyclohexan-1-ol) has two $\mathrm{sp^3}$ carbons with different substituents on a cycloalkane, so it has two cis-/trans-isomers, and from what I was taught, is ...
-1
votes
0answers
15 views

Using Fiber Bragg Grating for chemical detection but it is not responding as required.What to do?

I am using the chemicals Nacl, Ethanol and a reference of water and putting it in the Fiber Bragg grating of 1552nm, which is connected to the optical meter and the other end to the light source.I ...
-1
votes
1answer
50 views

How to make deionized water drinkable? [on hold]

Having an unusally large and complete laboratory in high school, complete with a spectrometer, the class was told to never drink the deionized water after making it. I wonder, how do you make the ...
-1
votes
1answer
49 views

Chemichal difference between liquid sucralose and powder sucralose [on hold]

In my country (Brazil), sucralose comes in this two forms, liquid and powder. Looking on the nutritional table, liquid sucralose have no significant amount of carbohydrates or kcal; On the powder ...
2
votes
0answers
46 views

What is the right color of calcium copper titanate?

I'm browsing Alibaba for calcium copper titanium oxide $\ce{CaCu3Ti4O12}$ (CCTO) and I find it variety of colors: pure brown, pale brown, reddish brown or grayish dark brown. Wikipedia does not tell ...
-3
votes
0answers
18 views

Organic Chemistry--GOC(Resonance) [closed]

In how many of the following 2nd is more stable than first?
-1
votes
0answers
27 views

Aromatic or non aromatic compound [duplicate]

I am providing a picture of an organic compound , according to me the compound should be non aromatic as it has sp3 hybridized carbon in other ring , but in NCERT textbook it is written the given ...
-1
votes
0answers
31 views

Why is it called phosphodiester bond [on hold]

I´m currently studying the DNA-molecule and I´m trying to understand why it is called phosphodiester bond and not phosphoester bond, why di? Thankful for answer!
1
vote
0answers
20 views

UV-Vis absorbtion spectra of a radical cation/anion. Is it different compared to its even counterpart?

I am studying gas-phase Uv-Vis spectra of radical molecules. If one electron is removed/captured from the neutral even electron molecule, what can I expect from the absorption spectra? Will new peaks ...
-3
votes
0answers
20 views

“Cold Boiling” and its physico-chemical basis and applications [closed]

I need some information about "Cold Boiling" and its Physico-chemical basis and application in dissolving organic materials such as biofilms, pus and so on.
9
votes
3answers
510 views

How do I figure out how many hydrogens my compound actually has using a mass and NMR spectrum?

Question 3: It said $m/z = 122,$ and $m/z = 124$ is in a $3:1$ ratio, so I figured that meant that chlorine is present. Then I thought $m/z$ was the actual compound's molecular mass. So I used ...
4
votes
2answers
71 views

Clarification on the Clausius inequality

In Atkins' Physical Chemistry the criteria for spontaneity using Gibbs energy was calculated using the Clausius inequality: $$\mathrm dS ≥ \frac{\mathrm dq}{T},$$ and at constant pressure, $\mathrm ...
1
vote
0answers
39 views

Classic/killer/easy application for the deuterium kinetic isotope effect?

I'm a physicist. While visiting someone's o-chem class I learned about the existence of the deuterium kinetic isotope effect. This seems like an extremely sweet example of zero-point energy, and I ...
-1
votes
0answers
22 views

lowering the pH of NaOCl solution [on hold]

Hypochlorous acid is only commercially available in the form of sodium hypochlorite. From a chemical equilibrium standpoint, As the pH of the solution decreases, some of it changes to hypochlorous ...
0
votes
1answer
54 views

Thermodynamic statements [closed]

Question 13 from [1, p. 4.2]: Which of the following statements is true? (a) An ideal gas always obeys the equation: $PV^γ = \mathrm{constant}$ in adiabatic process. (b) An ideal gas ...
-2
votes
0answers
13 views

What is the standard value of enthalpy of dissociation of hydrated copper sulphate? [closed]

I performed the experiment. But I am not sure about the result. If I could know the standard value, I can verify my result.
0
votes
1answer
29 views

Reduction potential as a function of pH

I have read that Latimer diagrams can be represented both in an acidic medium (pH = 0) and in a basic medium (pH = 14). I would like to know how to calculate the reduction potentials as a function of ...
-2
votes
0answers
56 views

How do I compare the order of acid strength of formic acid, acetic acid, phenol and ethanol? [closed]

Compare the acid strength in the following: $\ce{HCOOH}$ $\ce{CH3COOH}$ $\ce{C6H5OH}$ $\ce{C2H5OH}$ I tried to take a look at their conjugate bases stability but can't really ...
2
votes
2answers
96 views

Calculating partial pressure of carbon monoxide

$\ce{ZnO}$ is exposed to pure $\ce{CO}$ at $\pu{1300 K}$ and the equilibrium $$\ce{ZnO(s) + CO(g) <=> Zn(g) + CO2(g)}$$ is then established at $\pu{1 atm}$ pressure. The density of the ...
-3
votes
1answer
47 views

Finding the percentage of chloride in an unknown solution [closed]

“A student dissolves 0.907g of an unknown solid in water. He adds excess AgNO3 and precipitates AgCl. He obtains 2.350g of AgCl. What is the percent of Chloride in the unknown solid?” Hello I’m ...
-1
votes
0answers
14 views

Dissolution of dilute solutions of hydrogen peroxide and sodium hypochlorite [closed]

Can dilute solutions of hydrogen peroxide and sodium hypochlorite be mixed in a suitable container? If yes, to what extent?
0
votes
0answers
25 views

Inorganic foreign author books for odd electron species [duplicate]

I need a foreign author book which explains odd electron species in great detail ,(explaining dimerization , energetic) telling hybridization of central atom with one unpaired electron on it pls tell ...
0
votes
0answers
18 views

Forming Basis Functions from 6-31G Basis Set for Carbon Atom

I am a computer science grad and I am working to write an electronic structure calculation program and I am stuck at forming basis functions using 6-31G Basis set for atoms having higher atomic ...
0
votes
0answers
11 views

trisodium phosphate and water heat of reaction [on hold]

I would like to know the trisodium phosphate and water heat of reaction. Can trisodiumphosphate in a closed vessel cause exotherm?. I am asking this because a closed vessel having tsp caused ...

15 30 50 per page