Xiaolei Zhu
  • Member for 8 years, 2 months
  • Last seen more than 2 years ago
Is pure water very corrosive?
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26 votes

That quote had false statements all over it. Type I ultra pure water (Milli-Q water, or others) are fairly common among all labs. They are not corrosive to stainless steel. As @chipbuster said, ...

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Have there been no advances in the determination of effective nuclear charges since Clementi and Raimondi in the 60s?
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13 votes

I would say the most important reason why no development for effective nuclear charges is that the concept of effective nuclear charges has fallen to disuse in the recent years. I can think of two ...

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Computational Chemistry (Ab Initio), what should I study?
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11 votes

Computational chemistry is not a new field, but yes it can be difficult to find the right approach to it, because it is so diversified. And that means to some degree what you need depends strongly on ...

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The Lewis structure of HNO3
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11 votes

Nitrogen is in the second row with no $d$ orbital in the valence shell. It obeys the octet rule and cannot have more than 8 electron. There are exceptions to the octet rule. Having less than 8 ...

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Wasn't Rutherford's assumption of gold foil to be made of single layer wrong?
8 votes

You were confused about the result of the experiment. It did not measure the size of the atom, but the size of the nuclei. Nucleus is the area of concentrated positive charge in the core of the atom, ...

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What's up with SiO₂ being tetrahedral?
7 votes

Every $\boxed{^{14}\textrm{Si}}$ atom is surrounded by 4 $\boxed{^8\textrm{O}}$ atoms. On the other hand, every $\boxed{^8\textrm{O}}$ atom is surrounded by 2 $\boxed{^{14}\textrm{Si}}$ atoms. ...

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EZ-Water - Fraud or breakthrough?
7 votes

According to the website of Dr Pollack himself, the health effect of EZ water is a proposed research project currently applying for funding. He has made no claim of any proven health effect, and he ...

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Does nitrogen pressure in tyres fluctuate to much a lower degree than air with changes in temperature?
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5 votes

There can be no scientific explanation, because the argument itself is incorrect. For the most part air is nitrogen. To be specific, about 80% of dry air is made up from nitrogen. In fact both ...

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Covalent bond deformation
5 votes

There are two distinct phenomena, which are somewhat related. Dynamical effect of molecular vibration Bonds do vibrate like springs, and as you said they can store energy by changing its ...

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How will these hydrogen atoms interact?
5 votes

How one atom interact with another atom is an difficult question and requires quite some calculations, even for a system with only two hydrogen atoms. Basically, this is done by solving the ...

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How does molecular orbital overlap affect energy?
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5 votes

Although the nature of orbital and wave functions can be puzzling, by the end of the day chemical bonds are hold together by the familiar electrostatic forces. Although the electrons don't have a ...

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Can a battery powered by iron and air really provide a feasible power source for automobiles?
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5 votes

This is certainly possible. In fact, there are a large number of metal-air batteries being developed all over the world. It is, however, strange that such high energy density is achieved, because ...

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Strong acid equilibrium
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4 votes

To be more strict, a strong acid is defined as one that completely ionize in aquatic solutions. And as always (in chemistry), completely means almost completely. In a strict sense the strong acid ...

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Atomic properties
4 votes

First it is very important to know that molecules don't freeze at one geometry and stay there forever. Even at absolute zero temperature, a molecule can go through any geometry imaginable, and what ...

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A full verion of the periodic table (For computer game)
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4 votes

You can find all these information on Wolfram Alpha. You can use the website directly to obtain these information, and you can call their API to directly fetch the data online from your own program. ...

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How to calculate molecular volume from the wavefunction?
3 votes

the volume seems to be already in the output: $\text{Molar volume}=305.994~\mathrm{bohr^3/mol}\ (27.304~\mathrm{cm^3/mol})$ But of course, this is defined with the volume inside a density contour of ...

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How to properly relate quantum mechanical energy to the classical world
3 votes

You are treating the car as an elemental particle without inner structure, where the only degree of freedom is the overall translation. Within this model, it is true that QM seems to produce very ...

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Hydrogen ozonide existence
3 votes

Yes. It exists in the atmosphere, is proposed to be intermediate in various atmospheric reactions and has been experimentally detected. See Science Vol*285* No.5424(1999): p81 Note: Full text is ...

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What are the known atomic oxygen species?
3 votes

In this content atom means isolated atom, which have defined quantum states. This is to be distinguished with atom in a molecule, which is an entirely conceptual construction that have not strict ...

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Why Inductive effect operates only through single bonds?
3 votes

The argument is false. Inductive effects happen through any covalent bond. It is true that as far as systems with multiple bonds are concerned, conjugation, hyper conjugation, or resonance effects ...

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What are the states of HX when reacting with alcohol and alkenes respectively, and Br2 when reacting with benzene?
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2 votes

The first reaction ($\ce{HX}$+Ethanol) happens in solution. High concentration of HX mixed with ethanol will produce the product. However, for $\ce{X}$ other than $\ce{Cl}$, more often one put ...

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pH range outside conventional 0-14
2 votes

In short, it is possible to have pH outside of this range. However, in such cases, pH fails to be a useful or even meaningful measure. In concentrated solutions, one should use concentration directly....

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Helium empirical wavefunctions
2 votes

If you want a quick and dirty expressions in terms of hydrogen atom wave functions, you can try this: For ground state you can get a quick approximation by applying effective nuclear charge. Then ...

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