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votes
2answers
401 views

To which state of matter does the flame belong to?

I had this question from the day (9 years old, now 16) that I learned about states of matter. I have asked many of my teachers, some of them told me it's a gas some that it's a plasma. Can anyone ...
0
votes
2answers
446 views

Converting 1,4-benzenedimethanol to benzene and methanol?

I have the molecule 1,4-benzenedimethanol: How could I produce two methanol molecules and one benzene molecule? (Is there a catalytic reaction method available for this?) I'm guessing that hydrogen ...
1
vote
2answers
835 views

If “Gas” belongs to “State of Matter” then what does “Metal” belong to?

My question is, if "gas" belongs to "State of Matter" then what does "Metal" belong to. Gas can be substituted with any state of matter(in the analogy); metal can be substituted with metalloid or ...
1
vote
0answers
579 views

Calculation of molar volume at certain temperatures and pressures

I was wondering are there any calculators/calculations/means of calculation of molar volume at certain temperatures and pressures that don't use the Ideal Gas Law? i.e. The calculation of molar ...
0
votes
2answers
189 views

I want to make electricity of aluminiun cans i.e. reverse the process of refinning aluminium. Any ideas?

Recycling Al cans to produce electricity,i.e. to reverse the process of electrolysis and produce electricity
27
votes
1answer
2k views

Suggest methods and basis sets for a variety of systems

Please help me with any/all of the cases below. In the following cases, the named method and basis set are not suitable for the chemical systems. Why aren't they? Could you suggest a suitable method/...
1
vote
4answers
3k views

Lifetime of a (reversible) hydrogen fuel cell system

I am trying to determine how long a system that constantly converts water into H and O and then back will last, as in roughly how many cycles. Now this system can either be made of say a reversible ...
164
votes
1answer
35k views

Why can we smell copper?

If I can smell an object, it means that molecules of it are getting separated from it, so they can reach my nose. As far as I know, metals don't sublimate, especially not in room temperature. However, ...
0
votes
2answers
9k views

Lemon juice and carbonic acid reaction

I was doing a chemistry project to see if the pH of a carbonated solution effects the time taken for it to settle after being disrupted, and I am trying to map out the reaction when the components are ...
0
votes
1answer
132 views

Is it possible to use diatomic carbon to utilize a new type of fuel that takes away the waste product of carbon dioxide being released into the air? [closed]

These days, we as a community what to polish and make our world a greener environment. I found a way to accomplish this task, however I don't know if it is applicable. I am wondering if the use of ...
3
votes
1answer
2k views

Is hydrogen peroxide safe for cleaning porcelain?

From my understanding hydrogen peroxide only reacts with bacteria in a way that it should burn them more or less. If that is true, can I then safely use hydrogen peroxide to clean my bathroom sink ...
5
votes
2answers
2k views

Is tea powder better dissolved when put in hot water?

I usually make tea by adding two spoons of tea powder to water at room temp. and start to heat it. My friend said it will be better to add the powder once the water starts boiling. She said that it ...
0
votes
0answers
62 views

What is the nature and character of fire? [duplicate]

What is fire? Is it a material or energy or something else? Please explain it to me. My friend asked me this. I am stuck with this problem.
1
vote
1answer
1k views

Ionic Product of Water

Why is the ionic product for water ($K_\text{w}$) temperature dependent? The concentration of $\ce{H+}$ and $\ce{OH-}$ ions in pure water is $[\ce{H+}] = [\ce{OH-}] = 1.0\times 10^{-7}\ \mathrm{mol/l}$...
5
votes
2answers
620 views

What does it mean by degree of aromaticity of a molecule?

This is a fundamental question, though I didn't really get the meaning/idea what does it mean by aromaticity or degree of aromaticity. Does it mean the ability of a molecule to be aromatic?
1
vote
1answer
225 views

Calculating mass of krypton from mole fraction

There are two gases in a container: krypton and carbon dioxide. If the mass of the gases is 35 grams, and total pressure of the container is 0.708 atm, and the pressure of krypton is 0.250 atm. What ...
2
votes
1answer
595 views

Spices are absorbed or adsorbed in food?

When we cook food, we add several spices and condiments which enhance color, taste and smell. Are these spices and condiments just adsorbed on the food particles? Or are they absorbed? For example ...
2
votes
2answers
1k views

Calculating the molartity of DNA in a cell

In the following questions use a value of 3 for $\pi$, $6 \times 10^{23}$ for Avogadro’s number and 660 for the molecular weight of 1 bp of DNA. The volume of a sphere of radius r is $4/3\,πr^3$. ...
1
vote
1answer
121 views

Why is the pressure value altered in this gas law numerical?

When I work through the following problem it is unclear to me why 0.00120 mmHg is converted to 0.00332 mmHg. What is the temperature of 0.00332 g of mercury in the gas phase with pressure of 0....
1
vote
1answer
3k views

How do I determine crystal field splitting (for example, for [Ni(CO)4])?

How to know how many electrons are there in $T_{2g}$ and $E_g$ orbitals? I think rather than a broad answer, an example would help. So, consider the compound $\ce{Ni(CO)4}$ and how to calculate CFSE ...
2
votes
0answers
193 views

Can TBE electrophoresis buffer be stored in a PETE container?

I'm doing a science project on agarose gel electrophoresis and would like to know if it is safe to store Tris/Borate/EDTA buffer solution inside a PETE container since I will be making about 10L of ...
4
votes
1answer
171 views

Chemical Spill in Charleston, West Virginia

I live in Charleston, WV. On 1/9/2014 we were told not to use our tap water for anything other than flushing the toilet after a storage facility leaked over 7,400 gallons of 4-methylcyclohexane ...
2
votes
3answers
1k views

Is there a hydrophobic gas?

I am looking into the subject of water repelling and have been led to the hydrophobic subject area. I have two questions regarding this subject. Is there a hydrophobic gas ? If a hydrophobic ...
3
votes
1answer
740 views

Configuration Interaction matrix composition from electronic configurations

The six electronic configurations below could all be found in the matrix elements of the CI matrix at CISD level. How do I construct the 6 x 6 CI matrix composed of these six configurations and which ...
1
vote
1answer
4k views

why are Ca(OH)₂ and Al(OH)₃ less soluble than Na(OH) in water

Even though it has more $\ce{OH}$ groups and still it is very weak in terms of dissolving? please clarify to me in terms of polar and non polar solubility, how to determine whether a compound is ...
5
votes
2answers
257 views

Why does hydrogen so easily take the place of oxygen in organic molecules during reduction reactions?

It goes without saying that every reduction agent has different reducing properties and strengths in terms of what sort of bond it can reduce/hydrogenate. But, why does it generally follow that ...
5
votes
1answer
577 views

Voltage vs current density - why are both parameters important to control an electrochemical reaction?

In many electrochemistry scholarly articles/studies they talk about certain specific reactions occurring at certain voltage potentials, while in other articles they talk about current density as the ...
2
votes
1answer
2k views

reaction between Iron(ii) and Vanadium(v)

When we reduce Vanadium (V) using iron(II), why are we adding 85% Phosphoric acid? After the above reduction, if we are going to titrate the mixture with Potassium permanganate, why are we adding ...
1
vote
1answer
1k views

is there any mnemonic for the AXE method?

Is there any mnemonic that helps remembering the names of the different geometries (Shapes) that we obtain from applying the AXE method ?
5
votes
2answers
11k views

Why is platinum used as a catalyst in fuel cell electrodes (and elsewhere)?

I have rather basic knowledge of chemistry (at the level of a first year college class). But maybe somebody can still clarify with some simple words: What makes platinum a good catalyst for the ...
3
votes
2answers
110k views

What is the pKa Range for weak acids and bases?

Am I correct in assuming that the following is true? $\mathrm pK_\mathrm a < 3$ is for a strong acid $3 < \mathrm pK_\mathrm a < 7$ is for a weak acid $7 < \mathrm pK_\mathrm a < 11$ ...
1
vote
1answer
222 views

What can I use as a sacrificial electrode to stop the oxidation of aluminium?

For a solution of chromimum phosphate when putting in to solution aluminum there is removal of the aluminum. It is possible to prevent a galvanic cell, stop the etching of the aluminum, by putting ...
1
vote
2answers
214 views

How to find how much there is of a compound given the following information?

The detailed version of the question: If we burn a strip of magnesium in air, there will be two main products, magnesium oxide and magnesium nitride. If we then treat that mixture with water, the ...
3
votes
3answers
1k views

Alternatives to Ring Stands

I'm trying to find an alternative to simple ring stands to hold a simple electrochemical cell. The issue is that it is difficult to adjust the height to the right position to within even a couple ...
3
votes
1answer
367 views

How to synthesize t-Boc protected derivative of PVA

I've been toying with different potential recipes for DIY photoresist. My current favored design is a chemically amplified resist based on PVA (poly(vinyl alcohol)). For those who are unaware, a CAR ...
-2
votes
1answer
294 views

Thermodynamics Problems! [closed]

A cylinder, 0.5 m long and of cross section $S$, closed at each end is fitted with a smooth thermally insulating piston, so as to contain gas in each end A and B. Initially, the piston is in ...
4
votes
1answer
556 views

SN2 nucleophilic attack with alpha unsaturation

The following two questions prompted me to ask this question. Determine the order of the following compounds according to reactivity in Williamson Ether Synthesis. a. $\ce{CH3CH2CH2Br}$ b. $\...
2
votes
3answers
11k views

What is the pH of 1M Glycerol?

If the pKa of Glycerol is 14.15. How do you calculate the pH for it? I assume that the Henderson-Hasselbalch derivative that works for weak acids and bases is not applicable here.
1
vote
1answer
6k views

What is an equivalent?

I want to know what is an equivalent and how is it different from equivalent mass. How to calculate and why is it used in chemistry for knowing concentration?
3
votes
2answers
2k views

Reduction of terephthalic acid to an alcohol (or phenol?)

I want to convert terephthalic acid (TPA) to an alcohol (however I think the correct term would be "a phenol"). I've read that lithium tetrahydridoaluminate ($\ce{LiAlH4}$) can produce an alcohol ...
2
votes
1answer
146 views

Do the compounds NaₓIrO₂ and NaOsO₂ exist?

Based on some physics background, I want to know whether have scientists synthesized these two materials: $\ce{Na_{$x$}IrO2}$ and $\ce{NaOsO2}$ in the lab, if so, what properties do they have? I ...
3
votes
1answer
1k views

What's the difference between mass spectrometry, mass spectroscopy, and mass spectrography?

It seems that the terms mass spectrometry, mass spectroscopy, and mass spectrography are mostly used like synonyms. Is this correct? Or is there a difference?
3
votes
4answers
842 views

How to read a given chemical formula?

I'm trying to read this chemical formula but I'm a bit confused. I'm hoping that someone could help break this down for me to explain what the various parts mean. Someone purchased epigallocatechin in ...
5
votes
2answers
567 views

Can lye be extracted from bamboo ash?

I know that the best source of lye is hardwood. A brief search tells me that Bamboo is considered a hardwood of the monocotyledon variety. I've done a lot of searching to find this answer, but I can't ...
5
votes
1answer
1k views

How to predict a COSY NMR spectra for an AMX spin system?

Does anyone know how to draw (predict) a hypothetical COSY NMR spectra for AMX spin system (the spin of A M X nuclei is 1/2)?
1
vote
1answer
199 views

Ideal gas derivations

For an ideal gas, how can someone obtain this: $$ \bar{V}dP = RdT- P \bar{dV}$$ from which it can de deducted, that for a constant temperature $$ \frac{dP}{\bar{dV}} = -RT $$
2
votes
1answer
310 views

explain the reaction mechanism [duplicate]

$\ce{ROH + NaBr + H2SO4 -> RBr + NaHSO4 + H2O}$ What is exactly the reaction mechanism. Is it $\ce{NaBr + H2SO4 -> NaHSO4 + HBr}$ and then $\ce{HBr}$ reacts with $\ce{ROH}$? If yes the why ...
3
votes
1answer
4k views

Decomposition products of PET

On Wikipedia, it says that polyethylene terephthalate (PET) decomposes at temperatures above 350°C. What are these decomposition products? I read further that acetaldehyde is produced, but is that ...
7
votes
1answer
166 views

Ozone catalysis

I know that catalysts don't change chemical equilibrium because they accelerate both the reactions in the same way. I can't understand why CFC catalysts accelerate ozone destruction but not ozone ...
1
vote
1answer
3k views

Why is gold sol used for intra-muscular injection?

In my textbook it is written that gold sol is used for intramuscular injection. But, actually what is its use? Why would people use such a precious element for injection. Can other colloids be used ...

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