All Questions

-1
votes
0answers
5 views

The factor by which the percent hydrolysis of CH3COO Is greater in CH3COONH4 than in CH3COONa is

Both Conc. Being 1 M ,The factor by which the percent hydrolysis of CH3COO Is greater in CH3COONH4 than in CH3COONa is
0
votes
0answers
9 views

Conformer generation for radicals

Is there an automatic way to generate conformers for radical like systems (spin multiplicity is doublet)? My system for the study is a substituted fullerene with a missing H atom from the functional ...
0
votes
0answers
11 views

What fluorescent materials absorb visible light and emit UVC light?

What fluorescent materials, if any, exhibit anti-stokes shift such that they absorb visible light and emit ultraviolet light in the range of 250-285 nm? I'm interested in particular in materials that ...
-2
votes
0answers
14 views

How is the Iron electron configuration 1s2 2s2 2p6 3s2 3p6 3d6 4s2? [duplicate]

How come the electron configuration of iron is 1s2 2s2 2p6 3s2 3p6 3d6 4s2 not, 1s2 2s2 2p6 3s2 3p6 4s2 3d6 ?
-1
votes
0answers
12 views

Bonding Scheme for Structure and Bonding Lab

I want to know how I would do bonding scheme for NH3, H2O and C6H12.This is my first time being introduced to this concept. I know how to identify the electron geometry and hybridization.
0
votes
1answer
10 views

Determining the concentration after half-life period

I was given the reaction In diluted solution and with neutral pH, the reaction reacts according to a reaction velocity law of pseudo-1. order: $$-\frac{dc_{DNPA}}{dt}=k_{obs},\quad k_{obs}=k\cdot c_{...
-1
votes
1answer
14 views

Can I have a homogeneous 2 molal solution of copper(II) sulfate at 20 °C?

I'm doing a high school chem project where I am making a calibration curve of copper(II) sulfate for spectrophotometry in which I make solutions with five different concentrations. The most ...
0
votes
0answers
16 views

Calculating the amount of a product at the reaction equilibrium

$\ce{Cr2O3}$ can be reduced to the elements chromium with high temperature and carbon by this two reactions: $$ \begin{align} \ce{Cr2O3(s) + 3C(s) &-> 2Cr(s) + 3 CO(g)} \label{rxn:1}\tag{1}\\ \...
-1
votes
0answers
22 views

Cr to Cr2o3 (not in powder form)

how do you obtain Cr2O3 from Cr (large pieces)? Is there any acids who could be used? I only know of heated (NH4)2Cr2O7 to get Cr2O3 but this result in powder. I'll appreciate any suggestions! ...
-1
votes
0answers
13 views

Compare stability of the given carbocation [on hold]

Give the order of stability of the given carbocations.
-1
votes
0answers
8 views

Interhalo compounds Permanent dipole Intermolecular force [on hold]

Which compound between ICl and BRCl has stronger permanent dipole?
-1
votes
1answer
16 views

Determining the equilibrium constant

this is freely translated, I hope it's not too bad. The reaction to dehydrate Methylcyclohexane to Toluene in the gaseous phase: Formulate the reaction equilibriums constant. Now, that's not a ...
-1
votes
1answer
24 views

Does diluting the titration flask change the molarity

I was solving the following problem on a test and I thought the answer was A, but the answer is actually D. Below is the problem and my reasoning: Answer choice B is clearly incorrect because the ...
2
votes
1answer
32 views

Model of an ideal liquid in chemistry

In chemistry there are ideal models/concepts of ideal crystal, ideal gas and even ideal solution, but there is no model/concept of ideal liquid. In physics (fluid dynamics, to be precise) there is a ...
-1
votes
2answers
23 views

Solubility and pH

I was reading about antacids. It stated that in earlier times $\ce{NaHCO3}$ and a mixture of aluminium and magnesium hydroxide were used as antacids. In excess $\ce{NaHCO3}$ can make the medium ...
6
votes
2answers
1k views

Would sodium explode in salt water?

I’ve seen the video etc of sodium being put into freshwater and the reaction of flames/small explosion but I wonder if the same reaction would occur if conducted in salt water such as the ocean.
-1
votes
0answers
16 views

Equations for Iron (III) Nitrate reacting with Sodium Carbonate? [on hold]

I know that Iron (III) Nitrate reacts with Sodium Carbonate to form a precipitate. But I'm not sure how to write these equations. I have to also indicate oxidation states (charges on each ion) & ...
1
vote
0answers
9 views

Natural orbital population analysis in Gaussian

Within (restricted) density functional theory and Hartree-Fock, respectively the Kohn-Sham orbitals and spin orbitals are the natural orbitals, with occupation numbers either 2 or 0. As I understood, ...
0
votes
1answer
20 views

Is there any difference between thermal energy at room temperature in fluids(water) vs air?

Context of the question: I was reading on hydrogen bonds, specifically how close they are to the thermal energy of the fluids. So I googled the value of thermal energy at room temperature, which was $\...
-1
votes
0answers
20 views

How does seed crystal provide orientation to silicon melt in Czochralski process?

As i was curious in knowing orientation planes provided by seed crystal to silicon wafers(Ingot). In Czochralski process silicon melt of around 1400 degree a Here process is explained in general In ...
0
votes
0answers
27 views

Should I use MCPBA here?

I came across a question that asked for a method to convert propene to glycerol. I used the method in the pic, but I'm worried about two steps- Step-2, This reaction is just made up by myself! I'm ...
2
votes
1answer
31 views

Is Beer-Lambert law also valid for fluorescence and luminescence?

When I measure optical density in a microplate reader the absorbance is proportional to the concentration and the height of the liquid. Is Beer-Lambert law also valid for fluorescence and luminescence?...
0
votes
0answers
33 views

Probability of the single molecule reaction to happen

I am trying to simulate the single particle second order reactions with known rate constants $k_1$ and $k_{-1}$ in Python. The point of this simulation is to fit the real experimental data to the ...
1
vote
2answers
53 views

Which Oxygen atom in HCOOH (formic/methanoic acid) does Carbon donate its electrons to, to obtain a partial positive charge?

I was wondering if the Carbon atom in HCOOH (methanoic/formic acid) forms a positive partial charge by donating its electrons to both the Oxygen atoms, since they both possess a higher ...
-1
votes
0answers
8 views

How do i calculate the standard enthalpy change by using the substitution method? [on hold]

unless if using the cycle method is easier, please do show the calculation please
-2
votes
0answers
27 views

partial pressure [on hold]

The partial pressure of the $\ce{CO2}$ in a reactor kept at $\pu{2000 K}$ is $\pu{0.700 atm}$. After addition of hydrogen, the equilibrium $\ce{CO2(g) + H2(g)<=>CO(g) + H2O(g)}$ with $K_p=4.40$ ...
-1
votes
0answers
25 views

How were the densities of elements in the periodic table solved? [on hold]

Is there a formula for finding the density of an element? Example: density of Aluminum is 2.70 $\frac{g}{cm^{3}}$ I've tried using the ideal gas law (PV = nRT) with using the constants at STP (1 mol =...
-1
votes
1answer
28 views

What does the quantum number l refer to? [on hold]

Pls tell me if I am correct on the following points about quantum number l: 1)l refer to the names of orbitals and their shapes 2)the number of l tells the number of types of orbital in a shell
0
votes
0answers
21 views

Conductivity of aqueous solutions

Which $\ce{0.10 M}$ aqueous solution exhibits the lowest electrical conductivity? A) $\ce{HC_2H_3O_2_{(aq)}}$ B) $\ce{HNO_3_{(aq)}}$ C) $\ce{NH_4C_2H_3O_2_{(aq)}}$ D) $\ce{Ca(...
-1
votes
0answers
16 views

What is the final temperature of both the water and the quicklime? [on hold]

CaO + H2O = Ca(OH)2 + 65.2KJ/mol If a 500 g sample of water reacted with 10.0g of quicklime, what would the final temperature be? Assume that the initial temperature of both the water and the ...
-1
votes
0answers
15 views

How can I write electron configuration for Li2O? [on hold]

I know how to write electron configuration for Lithium and Oxygen separately, but I don't how to write it as a compound Li2O. Please explain this to me. Thank you.
0
votes
0answers
20 views

Aliphatic resin (wood glue) and Kerosene

Is it safe to combine wood glue and kerosene? Will the polymer chain length be destroyed? The thought is that i could stabilize wood slabs by driving the wood glue polymers into the wood by ...
-1
votes
0answers
31 views

Copper sulfate and Postassium iodide Reaction [on hold]

I conducted an experiment with these two aqueous solutions. I understand that the following is not true: CuSO4(aq) + KI(aq) → CuI2 + K2SO4 This means that since CuI2 doesn't exist, so the ...
-1
votes
1answer
23 views

Is the equilibrium constant related to concentrations

In an acid-base reaction, let K be the equilibrium constant and t the equilibrium position. We learned that K is only affected by temperature, while t is affected by other factors including ...
0
votes
0answers
25 views

Calculating temperature change of Helium due to Joule-Thomson effect

We are trying to fill a rocket helium tank that is 78 liters with Helium, final pressure 0f 10,500 psi. We plan to pressurize high pressure tanks to 20,000 psi using a compressing pump system, so that ...
2
votes
0answers
14 views

High concentration of ferric ion catalyst decreases rate of decomposition of hydrogen peroxide in the Fenton reaction

I did a project on the Fenton reaction and rate of decomposition of $\ce{H2O2}$. I used colorimetry to measure the rate of decolourisation of methylene blue when I mixed $\pu{5e-6 mol}$ $\ce{FeCl3}$ ...
2
votes
0answers
38 views

What is Delta H for dissolution? [on hold]

An ionic compound has a solubility of $1\ \mathrm M$ in water at $25\ ^\circ \mathrm C$ and its solubility increases as the temperature is raised. What are the signs of $\Delta H^\circ$ and $\Delta S^\...
-2
votes
0answers
16 views

Can theobromine have enantiomers [on hold]

So I was wondering if the compound theobromine can have enantiomers if so, why and where. I currently don't know where the chiral center is, I only know that it has positional isomers.
-1
votes
0answers
18 views

How to remove protein smell?

When I took a chemistry class a few years ago and I remember the teacher saying , like dissolves like. So with that logic, is there a say to denaturalize protein? I spilled a protein shake in the back ...
0
votes
0answers
26 views

Temperature increase in the reaction between magnesium and steam [on hold]

I want to approximate the temperature increase for a piece of magnesium reacting with steam $$\ce{Mg(s) + H2O (g) → MgO (s) + H2 (g)} \quad\Delta H = \pu{-360 kJ mol-1}$$ So, I've made a couple of ...
-1
votes
0answers
17 views

Finding unknown compound [on hold]

A compound X (mol. wt. = 86) doesn't shows tautomerism and has double bond equivalence equal to 1. But, Structural Isomers of X can show tautomerism. (Structural isomer of X is a mono substituted ...
-1
votes
2answers
27 views

why is are weak acid-strong base and strong acid-weak base reactions irreversible?

In the case of both are strong, I can see why it's irreversible, because the acid is very willing to give a proton and the base is very willing to take one. Now here are my 2 main questions: 1-in the ...
2
votes
1answer
34 views

will the autoionization of water reduce due to common ion effect?

When a weak acid is added to water , will the dissociation of water reduce due to common ion effect caused by increased H+ concentration due to acid , my text book said common ion effect is caused by ...
-3
votes
0answers
17 views

Can h2o2 be decomposed by alcohol or is Noah + cao favourable? [on hold]

I have answered a question asking which of the products can decompose h2o2 I answered naoh + cao (one of the options given) But they said its wrong
-1
votes
1answer
22 views

Opening the imidazoline ring in tolazoline

Hello. I was studying about the alkaline ring opening or purines. While doing research, i came across this compound. This got me thinking if we can use the same procedure to open the imidazoline ring ...
0
votes
0answers
14 views

Sorting ions by radius and ionization energy

Sort the ions $\ce{F-}$, $\ce{Mg^2+}$, $\ce{O^2-}$ by their ionic radius and the minimal energy needed to remove an electron. For the radius I considered that they all have the same electron ...
0
votes
0answers
21 views

Is this true that the decay bones catch fire as the reacn. In the figure [on hold]

here I have given you the picture of reacn between calcium and phosphorus which forms Ca3P2. And this reacts with HoH to form phophine gas and this reacts with oxygen to have a fire I want to ask you ...
1
vote
2answers
37 views

Waste water treatment [on hold]

This is a very simple question: Why are oxidized compounds generally thought to be less toxic/polluting than reduced species? This is used in waste water treatment where oxidizing agents (such as ...
-1
votes
2answers
40 views

Finding mole fraction from molality

Calculate the mole fraction of ammonia in a $\pu{2.00 m}$ solution of $\ce{NH3}$ in water. What I know is that the formula for mole fraction is $$X = \frac{\text{no.-of-moles-of-solute}}{\text{(no.-...
0
votes
1answer
30 views

Gibbs free energy ΔG=ΔG°+RTln(Kp) different expressions for ΔG

ΔG=ΔG°+RTln(Kp) If I understand it correctly, the ΔG in this equation gives the "distance" in Gibbs free energy of a chemical system at a particular moment in a reaction (encoded by the Kp) to the ...

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