40 votes

Would it be possible to destroy gold?

Other than a nuclear reactor, the only chance is to dump it into a volcano. Having a much higher density than magma, it will just fall through until it hits earth's mantle. Then it's really gone. OK, ...
Karl's user avatar
  • 12k
34 votes

Is "stainless" a bulk or a surface property of stainless steel?

Let's divide the steel world into two classes: 1) rusting steel and 2) stainless steel. Rusting steel, in the presence of oxygen and moisture, will oxidize, forming hydrated iron oxides/hydroxides ...
James Gaidis's user avatar
33 votes

Would it be possible to destroy gold?

As other answers have pointed out, you can't 'destroy' gold chemically. Putting it in a nuclear reactor for an extended period of time will functionally convert most of it to an isotope of mercury. ...
Austin Hemmelgarn's user avatar
32 votes

Would it be possible to destroy gold?

Not destroying gold, but still giving a good appearance, is this time-honored story of how two golden Nobel prizes were "hidden" from the Nazis by dissolving the gold into aqua regia. The aqua regia, ...
Oscar Lanzi's user avatar
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21 votes
Accepted

Is "stainless" a bulk or a surface property of stainless steel?

It is usually a bulk property though you would need to know exact regulations for your country to be certain. Stainless steel is steel (i.e. iron + a little bit of carbon) alloyed with another metal (...
SteffX's user avatar
  • 2,992
14 votes
Accepted

If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

A good question, but not sure it's possible, at least by polishing the given structure: if the boride layer is tightly bonded, I'd imagine it would be hard to remove such a layer, leaving the isolated ...
DrMoishe Pippik's user avatar
13 votes

Would it be possible to destroy gold?

If you don't use any nuclear technology, you can't destroy gold. Everything that you can do to the gold, can be undone.1 What you can do: you can make its reconstruction economically infeasible. ...
peterh's user avatar
  • 906
12 votes
Accepted

Is adsorption exothermic, and if so, why?

There are two common arguments presented as for why $\Delta H < 0$: Argument (1): Well, indeed I see nothing wrong with the argument presented by the textbook. If adsorption takes place ...
getafix's user avatar
  • 8,485
11 votes

Is "stainless" a bulk or a surface property of stainless steel?

"Stainless" is not a specific definition. The stainless steel with the least alloy is $5\% \; \ce{Cr}$ ( grade 501) according to AISI (It can't be cut with an oxygen/acetylene torch-like regular steel)...
blacksmith37's user avatar
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10 votes
Accepted

When using LPCVD, is it possible to pattern a silicon wafer with poly-silicon using a mask?

In my fab experience, the answer is no, you are not going to inhibit deposition of silicon with some other material. You might well change the final grain size, but it will deposit. Furthermore, LPCVD ...
Jon Custer's user avatar
  • 8,399
10 votes

How to remove stain from pavement after having dropped sulfuric acid on it?

You did the right thing by neutralizing with a base. The best solution is to let time heal the stain. The surface is obviously damaged, but there is no way to reverse that damage. The stain will only ...
AChem's user avatar
  • 39.8k
10 votes

Why are van der Waals' forces between gas molecules strong near its critical temperature?

Critical temperature is kind of measure of the strength of intermolecular van der Waals force. Comparison of actual and critical temperature is kind of comparison of average kinetic energy of ...
Poutnik's user avatar
  • 41k
9 votes

Would it be possible to destroy gold?

Gold is extremely difficult to get rid of, either chemically or physically. Gold is produced when a massive star goes supernova. Every single atom of gold in the entire universe is the result of the ...
Mausy5043's user avatar
  • 191
9 votes

Is "stainless" a bulk or a surface property of stainless steel?

Quick and simple: Steel = iron + carbon (less than 2%; also called "forgeable iron") Adding chromium (min. 12 %) makes it stainless. These chromium atoms are spread over the full volume of your block,...
rüdiger's user avatar
9 votes
Accepted

Effect of solutes on surface tension

Davies and Rideal1 published the following graph. This graph nicely describes the action of various solutes on a solution. It's clearly visible that: Addition of $\ce{MeOH}$ reduces the surface ...
Aniruddha Deb's user avatar
8 votes

If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

Undoubtedly yes. Giamello et al.[1] give an example involving a very subtle effect of this nature on a magnesium oxide (100) surface (meaning a square array of magnesium and oxygen atoms lying along ...
Oscar Lanzi's user avatar
  • 56.1k
8 votes

If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

Sure! The example most surface scientists should be familiar with is that of alpha silicon carbide or $\ce{\alpha-SiC}$. Alpha silicon carbide (α-SiC) is the most commonly encountered polymorph, and ...
uhoh's user avatar
  • 5,758
7 votes

Hardy Schulze law

In order to explain the Schuze-Hardy rule, you have to take into account that you are working with a colloidal dispersions stabilized electrostatically. The stability of this dispersions is well ...
PAEP's user avatar
  • 1,055
7 votes

Would it be possible to destroy gold?

Gold has one principal isotope (gold-197) and all other isotopes are unstable and decay mostly by beta emission into isotopes of mercury. Given that its cross section is 98.7, it will act as a neutron ...
ted thomas's user avatar
6 votes
Accepted

How does polydimethylsiloxane stick to glass?

If you ask a chemist about PDMS and its adhesion to glass, she will immediately think of the work done in constructing micro-reactors. This is because one method of manufacturing micro-reactors is to ...
DarrenRhodes's user avatar
6 votes

Why even the most volatile solvents leave a residue after evaporating?

If the surface material is clean and neither soluble nor reactant in any way with the solvent, then it is probably a solvent purity issue. If you have a good micro-balance, you could pour a known ...
airhuff's user avatar
  • 17.4k
6 votes
Accepted

How does water freeze and crystallize on a cold superhydrophobic surface?

As acknowledged in your question, there are a large number of factors at play here. The most basic of these is that there are three fundamental mechanisms by which freezing of a droplet can initiate ...
airhuff's user avatar
  • 17.4k
6 votes

Where does the potential energy of capillary action come from?

Where does this potential energy of capillary action come from, or is this an exception or something? First, the laws of thermodynamics still apply. Second, you have to account for the energy balance ...
Karsten's user avatar
  • 39.8k
6 votes

If something is not hydrophilic, is it necessarily hydrophobic?

Two water drops 1 mm apart do not attract each other, if I omit gravity and electrostatic charges. Are they hydrophobic ? No, they are not. The relevant intermolecular forces are contact ones, ...
Poutnik's user avatar
  • 41k
6 votes
Accepted

LEED - determining surface structures

An incomplete list of suggestions: From the position of the spots, did you determine their mutual distances (e.g., to discern a square from a rectangle), and angles if you connect «the dots»? Beside ...
Buttonwood's user avatar
  • 29.1k
5 votes
Accepted

Why does the BET equation take into consideration a multimolecular-layer, even though it deals with chemisorption?

Brunauer–Emmett–Teller (BET) explains the physical adsorption of gas molecules on a solid surface, and doesn't address chemisorption. Even the wikipedia link that you provided, makes that quite ...
getafix's user avatar
  • 8,485
5 votes

How does polydimethylsiloxane stick to glass?

As the above comments mention, van der Waals interactions are the primary types of intermolecular forces forces involved in the adsorption of any molecule onto a surface. Given that PDMS does not ...
jamaica's user avatar
  • 826
5 votes
Accepted

Using results of current experiments in silanization, how to achieve a higher contact angle?

It's always good to clean glass surfaces with oxygen plasma or UV ozone treatment before silianizing, but 108° is pretty good with an alkylsilane. The best you will be able to do with this type of ...
Michael DM Dryden's user avatar
5 votes
Accepted

What is the chemical structure of ceramic nonstick coating on pans?

There is a near continuum (and thus a potential infinitude) of relative concentrations of the different components of ceramics and their means of fabrication, but US Patent US7879449 B2 (PDF) gives a ...
airhuff's user avatar
  • 17.4k
5 votes

Substances comprised of large molecules are liquids at room temperature?

You may give porphyrins a try. These dyes are of interest for molecular electronics, and to render them less crystalline / more glassy, alkyl chains are attached to the central motif. One recent ...
Buttonwood's user avatar
  • 29.1k

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