# All Questions

28,650 questions
8k views

### Why does the solubility of some salts decrease with temperature?

It is well known to us that the Solubility of solute in a solution increases with the increase in the temperature because, when the temperature increases the molecules of the solvent gain more kinetic ...
15 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 ...
4 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
36k views

### Why does bond angle decrease in the order H2O, H2S, H2Se?

I know that bond angle decreases in the order $\ce{H2O}$, $\ce{H2S}$ and $\ce{H2Se}$. I wish to know the reason for this. I think this is because of the lone pair repulsion but how?
5 views

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 ...
10 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 ...
16 views

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### 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 ...
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.
545 views

### Negative oxidation states of Si

According to List of oxidation states of the elements, silicon has a possible oxidation state of $-4$. Now, I've been looking everywhere for a compound that contains Si(-IV), but I cannot find any ...
2k views

### How to rotate a chiral carbon

I know that to correctly assign R,S priorities I have to rotate the above figure until the H is projecting into the page (away from me). However, I don't know how to rotate the H and the rest of the ...
135 views

### Possibility of π–π stacking in non-aromatic systems

Is it possible to have π–π stacking for non-conjugated double bond systems? For example, can the carbonyl groups of two urea molecules participate in π–π stacking? Although urea prefers to stay in ...
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 ...
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! ...
468 views

### If polar non-polar intermolecular forces are stronger, why do polar compounds elute first in GC?

I remembering reading that the interaction between a polar molecule and non-polar molecule is stronger than the interaction between two non-polar molecules. However, in analytical chemistry classes, ...
31 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 ...
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 ...
12 views

### Compare stability of the given carbocation [on hold]

Give the order of stability of the given carbocations.
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 ...
8 views

### Interhalo compounds Permanent dipole Intermolecular force [on hold]

Which compound between ICl and BRCl has stronger permanent dipole?
39 views

### How to Calculate Lennard-Jones Parameters from TDDFT?

I am trying to develop parameters for AMBER force fields and to calculate Lennard-Jones parameters for the $\ce{Fe^3+}$ ion. I did a deep search and found that the best way to do this with a high ...
63 views

### Density of d-block elements

Something that confuses me slightly is the trends in density when comparing periods 4, 5, and 6 in the d-block. Looking at periods 5 and 6, the density peaks at group 8, with ruthenium and osmium, ...
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 ...
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.
1k views

### Decomposition of iron(III) acetate?

I recently asked about the synthesis of iron (III) acetate. I want a rather concentrated solution to use as a calligraphy ink (which will be dissolved in alcohol/water). Will it be okay to heat the ...
5k views

### Does iron(III) sulfate react with copper?

As my understanding, there should be an oxidation-reduction reaction: $$\ce{2 Fe^3+ + Cu → 2Fe^2+ + Cu^2+}$$ However, I always see the process using $\ce{FeCl3}$ to etch copper, but I never ...
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) & ...
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 ...
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### Largest alkane having a given alkane as its base name

What is the largest (most carbon atoms) alkane having heptane as its base name? For example, 2,2,3,3-tetramethylbutane is the largest (most carbon atoms) alkane retaining butane as its base name.