0
votes
2answers
10 views

Do only metals form ions?

This may be a very dumb question, but do nonmetals form ions? I am asking this because I was reading something and I came across the phrase "metal ions," which left me to wonder whether or not there ...
0
votes
0answers
5 views

What materials are used to thermally imprint graphics on cotton fabrics?

For example t-shirt shops transfer color masks onto the cotton fabric using a thermal press. What materials are those masks made of?
0
votes
1answer
8 views

Formalin fallen out of solution

Is there a way to bring back into solution a bottle of formalin that has crystallized? The bottle has been stored for several years at room temperature. Thanks in advance.
0
votes
1answer
7 views

Mixing 1 cubic meter of HCl and NaOH: Temperature rise of a metal container?

Say I (perfectly) mix 1 $m^3$ of 1 M $\ce{HCl}$ with 1 $m^3$ of 1M $\ce{NaOH}$ at standard air pressure and room temperature within a metal vessel. Heat of neutralization for strong acids and bases is ...
6
votes
1answer
200 views

Why water spills on our shirt change its colour?

While drinking water, some of it fell on my shirt and as usual, as has happened to many of us, the colour darkens? So why does this happen ? Is it due to some chemical effect or physical one ?
0
votes
0answers
11 views

When do one have to actually calculate the net charge of an amino acid?

When the pH and the pKa levels differ by 2 or more you don't need to calculate the net charge. What you do then is to just count the negative and positive charge and add them up. When pH=pKa you also ...
0
votes
1answer
8 views

Solubility of Gold in low concentrations

When preparing ICP-MS calibration standards for trace metal (~100 ppt) analysis, the values for Gold do not remain stable for more than a day. The standards are prepared using commercially available ...
1
vote
1answer
11 views

Why does phosphorous give a free electron in silicon doping?

Extrinsic semiconductors are created by doping an intrinsic semiconductor; typically silicon is doped with phosphorous to create free electrons or boron to create "holes". In the case of phosphorous ...
2
votes
0answers
8 views

What angle limits should apply to Graham condensers?

I have seen Graham condensers set at an angle (perhaps as low as 30 degrees from horizontal). I guessed this wouldn't be a problem because siphoning would clear the condensate. But I recently saw an ...
3
votes
0answers
10 views

Which are the appropriate washing solvents for gas chromatography equipment?

I work in a laboratory where gas chromatography is used extensively. We handle terpenes and terpenoids (alcohols, ketones, and acetates derived from terpenes), organic solvents (acetone, acetonitrile, ...
8
votes
1answer
376 views

Are long Oxygen molecules possible?

Are large oxygen containing molecules possible? Either large rings, or chains with hydrogen atoms at the ends. Like this: $\ce{H-O-O-O-O-O-O-O-O-O-... -O-O-O-O-O-H}$
0
votes
0answers
11 views

The solubility of salt A in water 40 g/l at 25 °C [on hold]

10 g of salt A are dissolved in water to form 500 ml solution x at 25 °C. Find the concentration of the resulting solution x
0
votes
0answers
20 views

Mass percentage of KClO3 in decomposition reaction

When heated, a 3.40 g sample mixture of $\ce{KClO3}$ decomposes and produces 685 cm$^3$ $\ce{O2}$ gas at 30 $^{\circ}\mathrm{C}$ and 101 kPa. What is the mass percentage of $\ce{KClO3}$ in the ...
0
votes
0answers
16 views

charge on nascent atoms

What is the charge on nascent atoms? Like [H] or [O] I initially thought that they were like free-radicals, without any charge but having unpaired electrons instead. I asked my teacher, who said that ...
-1
votes
0answers
13 views

How do I prepare the following solution I found in a research paper?(Details given below)

So I came across this research paper to synthesize nanoparticles and I want to replicate the experiment they did.Here is their experimental procedure(in their words) : 1.FeCl2·4H2O and FeCl3·6H2O ...
1
vote
1answer
24 views

Name the following coordination complex

What are the IUPAC rules when naming a coordination complex like: $$\ce{[Pt(NH3)4][Pt(NH3)Cl3]}$$ Now according to my textbook, it is named as tetraammineplatinum(II) ...
4
votes
1answer
39 views

What advantages does the mole have over counting large numbers using SI prefixes?

I'm trying to understand why chemists use the mole unit instead of just counting and using SI prfixes to simplify the big numbers with units such as zetta- or yotta-molecules (yotta=10^24). Here's ...
0
votes
0answers
15 views

p-orbital versus s-orbital energies in hydrogenic atoms [duplicate]

In hydrogenic atoms, how can it be that the s-orbitals have the same energy as the p-orbitals (provided they have the same principle quantum number of course), even though on average the electron is ...
3
votes
1answer
114 views

How to calculate the pH of low concentration Hydrochloric acid in water

For relatively high concentrations of $\ce{HCl}$, I usually just assume that $\ce{[H+] = [HCl]}$, because $\ce{HCl}$ is a strong acid and completely ionizes. By taking the negative log of the ...
-2
votes
0answers
12 views

Solubility rate vs temperature as a percentage [on hold]

I am doing an experiment on the solubility rate vs temperature. I have recorded the time it has taken for certain substances to dissolve. How do I work out the solubility rate as a percentage?
0
votes
0answers
9 views

Zirconium enolates stereoselective addition to carbonyls

Why do zirconium enolates almost always afford syn aldol products stereo-selectively with other carbonyl compounds?
1
vote
1answer
31 views

Regioselectivity for electrophilic aromatic substitution with multiple strongly electron withdrawing groups

At which position will electrophilic substitution on p-cyanonitrobenzene occur? As both are -M groups, there are two possible sites of reaction, meta to each of the groups. The answer is meta to ...
1
vote
1answer
20 views

Calculation of the lowest energy conformation with a webbased solution or freeware

I like to draw a molecule in different conformations in a) website or b) freeware and Calculate its relative energy difference (for example to the lowest global energy conformation) Display the ...
0
votes
0answers
8 views

Does plastic packaging affect the food in them and if so how? [on hold]

Does plastic packaging of food have effects on them, how do they do?
0
votes
0answers
4 views

With respect to colloid chemistry explain why sky is red in the morning and evening and blue at noon

Can colloid chemistry explain the phenomena behind why sky is red in the morning and evening but blue around noon?
1
vote
0answers
21 views

Is atom other than hydrogen form bond similar to hydrogen bond?

For instance, is there any "lithium bond"? If not, why other atoms don't form such type of bonding?
1
vote
1answer
44 views

Can we have Aromatic rings in a non-aromatic structure

Is it possible to have aromatic rings inside a structure that itself is non-aromatic? Is there an example.
0
votes
2answers
42 views

Why is this named incorrectly?

In my Ap chem class I got this sheet with the names of a bunch of common polyatomic ions. One of them is named monohydrogen phosphate ($\ce{HPO4^2-}$). In naming, I learned not to use ‘mono-’ if it’s ...
1
vote
1answer
32 views

At what point does Avagadros law not apply?

A mole of hydrogen gas takes up 22.4 L, but so does a larger molecule like $\ce{CO2}$. Methane ($\ce{CH4}$) is an even larger sized molecule, but a mole of it will still take up 22.4 L. I would assume ...
0
votes
1answer
23 views

How much does a light heat the air around it?

My dad told me to turn off the lights when I'm not using them because it will keep the house cooler. I don't think he is correct that a light can heat up the room. How much of a difference in the ...
3
votes
0answers
19 views

Combustion without hydrogen

Is there any fuels without hydrogen that will combust. My friend believes there might be and do to my experience I have never heard of one. Please explain and if u can show a balanced equation of this ...
2
votes
1answer
33 views

Molecules Molecules?

Question is simple I was just wondering if for example If I have a water molecule (H2O) and I have hydrochloric acid and they will get bound together, would they become a molecule made of molecules, ...
1
vote
0answers
17 views

Program to covert WFN-file to Molden

I have tried google but without success so here the question: does anybody know a tool that can covert WFN-file to Molden or to Molpro format (including orbital info not the coordinates only).
0
votes
2answers
34 views

How do things “glow in the dark”?

The only explanation that I can come up with for what makes things "glow in the dark" is that there is probably a chemical reaction slowly releasing the light that was previously absorbed. Am I ...
1
vote
0answers
13 views

The conversion of energy during electroplating

I've made a test and i've faced a problem with a part of a question which says: "What is the conversion of energy occuring in electroplating? " I answered that it is conversion from electric energy to ...
2
votes
1answer
22 views

Can rocket candy explode during the preparation?

I would like to follow the steps in this video: https://www.youtube.com/watch?v=hyPysthIRss After I mixed the Potassium nitrate KNO3 and the ...
0
votes
0answers
25 views

What type of hybridization does phosphorus have in P2O5?

I'm inclined to think that P has a $dsp$ hybridization in that compound, because it makes 5 bonds and 2 of them are $\pi$ bonds - with oxygen. However, I found in some websites that it may have $sp^2$ ...
0
votes
1answer
17 views

Cooking with vinegar and lemon juice (Carpaccio)

I know the Maillard reaction to cook at 140-160 C. I know the low temperature cooking reaction to cook at 70 C. But which is the reaction that allow us cooking meat or fish with vinegar or lemon ...
2
votes
4answers
116 views

Work Done Upon Molecules

In which of the following processes is energy transferred into the substance by work ($w > 0$)? a) Expansion of a gas against the surroundings b) Expansion of a gas into a vacuum c) Vaporization ...
0
votes
0answers
14 views

Ambidentate ligands

What are the eligibility criteria for ligand to be ambidentate? Is the size of cation and anion or hard and soft acids are only conditions for ligand to be ambidentate?
1
vote
1answer
32 views

How do scientists count the exact number of electrons, protons, neutrons in the atom?

An atom is very small so it is probably difficult to focus exactly on a single atom. I wonder how scientists count the exact number of electrons, protons, neutrons in an atom of a certain element. ...
4
votes
1answer
27 views

What is a food-safe level of exposure of plastic containers to heat?

There are many articles about how heat can trigger the release of potentially harmful carcinogens from plastic containers into the food or liquid they contain. Specifics they fail to mention, though, ...
1
vote
0answers
6 views

Steps in mechanism of pyruvate dehydrogenase

I am having some trouble with certain steps in the above mechanism (from Proteopedia) detailing the mechanism of action of pyruvate dehydrogenase converting pyruvate to acetyl-CoA. In the first ...
0
votes
0answers
25 views

How can I measure the amount of CO2 in grams in a known volume of soda based on its weight?

We have a soda machine that can fill either still water or soda. In both cases the amount is 400 ml in the beaker, but the soda weighs a little less. How can we use the volume X = 400 ml and the ...
2
votes
0answers
21 views

Do more double bonds cause a bigger number of stereoisomers in cycloalkenes?

If trans double bonds cause cycloalkenes to be chiral, does a second trans or maybe cis double bond induce another chiral plane and hence four stereoisomer are possible for the given cyclodiene? The ...
6
votes
2answers
131 views

Are all higher cycloalkenes chiral?

Are all higher trans-cycloalkenes chiral as trans-cyclooctene is? This question supplements my previous question: Why is trans-cyclooctene chiral? See also the follow-on question: Do more double ...
1
vote
2answers
42 views

Percent concentration of 500 μM of H2O2

What is the percent concentration of hydrogen peroxide which has a molar mass of $500~\mu\mathrm{M}$? Is $500~\mu\mathrm{M}$ $\ce{H2O2}$ toxic to the eyes? A particular honey has a concentration of ...
-1
votes
0answers
10 views

Separate hydrogen in gas phase chromatography using helium as carrier gas [on hold]

Why isn't helium used as carrier gas to separate hydrogen in gas chromatography? My search so far didn't yield a reasonable result, but maybe you have an idea.
4
votes
1answer
43 views

Is Hydrogen Bonding a Type of Dipole Dipole Interaction

I understand that dipole dipole forces is due to the attraction of the different partials charges of atoms in different molecules due to their different electro-negativities. For example in ...
0
votes
0answers
9 views

Anomalous configuration for Palladium?

The p block elements generally have the general valence she'll configuration as $$n\mathrm{p}^{1-6}\,n\mathrm{s}^{1-2}.$$ Expected electronic configuration for palladium is $$\ce{^46Pd} = ...

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