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60cm3 of Oxygen was added to 10cm3 of a gaseous unsaturated hydrocarbon. After explosion and cooling to room temperature, the residual gaseous occupied 45cm3. What volume of Carbon Dioxide was formed in the reaction?
Edit:
I've tried to make equation out of it:
(CH2)n + O2 ---> CO2 + H2O
My problem now is I d... |
Platinum and Palladium are great catalysts. At the same time, other metals of the same family are not. What is the atomic level reasons for this? |
why platinum/palladium are such a good catalyst? |
$60\ \mathrm{cm^3}$ of oxygen was added to $10\ \mathrm{cm^3}$ of a gaseous unsaturated hydrocarbon. After explosion and cooling to room temperature, the residual gaseous occupied $45\ \mathrm{cm^3}$. What volume of carbon dioxide was formed in the reaction?
Edit:
I’ve tried to make equation out of it:
$$\ce{(CH... |
Making carbon monoxide gas from formic acid and sulphuric acid? |
From what I understand, the working agent inside a peltier cooler is Bismuth-Telluride. I've read a toxicity data-sheet regarding Bismuth-Telluride [here](http://www.espimetals.com/index.php/msds/50-bismuth-telluride).
If I were to use a peltier cooler inside a sealed cooling system, for example a thermoelectric co... |
What does change in entropy ($\Delta S$) represent ? How does change in entropy of a universe ($\Delta S_{univ}$) give us information about energy available to do work.
I would like to know the physical significance of entropy of universe and how it is related to energy energy released by system that can be used to d... |
How is change in entropy of universe related to the energy released by system that can be used to do work? |
The previous answers doesn't take into account the environment:
> They were operated in conditions of intense humidity/heat and were placed near the **sea**.
Near the sea means that there are certainly a lot of $\ce{Cl-}$ ions in your metal. Chloride ions are a very dangerous species for metals conservation they... |
You are correct in saying that it is possible but not common. This comes about as a consequence of the effective nuclear charge on the atom or Z. eff, and the size of the atom. Z effective if you are not familiar is a concept usually touched upon in chem 2 as a periodic trend. It is a measure of the charge felt by the ... |
I have about 2g of 99.5% Potassium.
I want to get rid of it, right now it's in a glass jar sealed.
What is the proper protocol? I was going to combust it in water and wash it down the drain but the by-product potassium hydroxide is caustic and hazardous so I don't think that's best.
Could I just throw it aw... |
> I was going to combust it in water and wash it down the drain
**No**, mixing it with water is a bad idea. Hydrogen gas will be liberated along with heat. In the presence of oxygen and heat the hydrogen will form a combustible / explosive mixyure.
> Could I just throw it away and it goes to a garbage facility ... |
I use Sodium persulfate to etch a copper board to produce a PCB. I mix 1 dl sodium persulfate with 1 liter hot water. When the water get cold, I heat it up by microwave. After the microwave, I see such crystallized particles at the bottom of the jar. Please note that there were not any solid particles in the acid befor... |
When I put aluminium parts into my dishwasher, they get tainted and they are sometime coverred with white dots similar to salt.
I don't think it is aluminium oxyde.
What is the chemical reaction that have an effect on aluminium but not other metals?
|
Why dishwashers are corrosive to aluminium? |
Why dishwashers are corrosive to aluminum? |
I want to enolize a ketone, let's take for instance acetone with a pKa value of about 20 (in $\ce{H_2O}$). Now I'd like to know if there exist rule of thumb (I don't think so), by how many pKa units the pKa of the ketone will decrease if we add one of the following lewis. I hope the lowering pKa values should be transf... |
How many units lowered pKa by addition of a lewis acid to a ketone? |
I want to enolize a ketone, let's take for instance acetone with a pKa value of about 20 (in $\ce{H_2O}$). Now I'd like to know if there exist rule of thumb (I don't think so), by how many pKa units the pKa of the ketone will decrease if we add one of the following lewis. I hope the lowering pKa values should be transf... |
By how many pKa units will the pKa value of a ketone be minimized by addition of a lewis acid? |
I want to enolize a ketone, let's take for instance acetone with a pKa value of about 20 (in $\ce{H_2O}$). Now I'd like to know if there exist rule of thumb (I don't think so), by how many pKa units the pKa of the ketone will decrease if we add one of the following lewis. I hope the lowering pKa values should be transf... |
The previous answers doesn't take into account the environment:
> They were operated in conditions of intense humidity/heat and were placed near the **sea**.
Near the sea means that there are certainly a lot of $\ce{Cl-}$ ions in your metal. Chloride ions are a very dangerous species for metals conservation they... |
I want to enolize a ketone, let's take for instance acetone with a pKa value of about 20 (in $\ce{H_2O}$). Now I'd like to know if there exist rule of thumb (I don't think so), by how many pKa units the pKa of the ketone will decrease if we add one of the following lewis. I hope the lowering pKa values should be transf... |
> I was going to combust it in water and wash it down the drain
**No**, mixing it with water is a bad idea. Hydrogen gas will be liberated along with heat. In the presence of oxygen and heat the hydrogen will form a combustible / explosive mixyure.
> Could I just throw it away and it goes to a garbage facility ... |
Sodium polyacrylate is a white powder with a characteristic odor. But when we add water to this powder, instead of forming a aqueous solution , it instantaneously solidifies and forms more amount of powder like substance, also called " hot ice".
Why and how this phenomenon occur?
video link - https://www.youtube.... |
Do you just have to remember that it is? |
How do you know that Sodium Hydrogencarbonate is amphiprotic? |
Do you just have to remember that it is?
For example, I know that substances with CHs are hydrocarbons. Does such a 'code', if you will, exist for amphiprotic substances ? |
Platinum and palladium are great catalysts. At the same time, other metals of the same family are not. What are the atomic level reasons for this? |
Well a reaction which is spontaneous has negative value of Gibbs or Helmholtz free energy. This free energy is the energy which is made available to be used for work.
How does that relate to your question? Both Gibbs and Helmholtz free energy are derived from the argument that change in entropy of the universe is gr... |
We know that both solids and liquids can exhibit metallic luster. I wonder whether there is a gas that when filling a transparent envelope (such as a glass tube) would make it appear with metallic luster? |
Is there a gas with metallic luster? |
Can the same argument be applied to Nitrous acid and Nitrite ion in aqueous medium? |
If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium? |
If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium?
Can the same argument be applied to Nitrous acid and Nitrite ion in aqueous medium? |
When I put aluminium parts into my dishwasher, they get tainted and they are sometime covered with white dots similar to salt.
I don't think it is aluminium oxide.
What are the chemical reactions that have an effect on aluminium but not other metals?
|
> I was going to combust it in water and wash it down the drain
**No**, mixing it with water is a bad idea. Hydrogen gas will be liberated along with heat. In the presence of oxygen and heat the hydrogen will form a combustible / explosive mixture.
> Could I just throw it away and it goes to a garbage facility ... |
Suppose that I take a pressure vessel that can hold up to 2000PSI force. Now I fill it with water (not completely, but around ~90%) and now I start to heat it with direct flame, LPG gas cylinder. What will happen after this, is what I want to know.
Although I don't know anything about it but following are some guess... |
What happens when heating water in a pressure vessel? |
what can I do with a degree in analytical chemistry other than working in the lab ?
and what is the future of being an organic chemist ?
can I be a researcher in both of them ?
or it's better to take organic chemistry if I want to be a researcher?
thank you for your great help |
Nitrogen triiodide on slightest contact explode to evolve dense purple fumes of iodine. Why this phenomenon occur?
video link - https://www.youtube.com/watch?v=2KlAf936E90 |
- what can I do with a degree in analytical chemistry other than working in the lab?
- And what is the future of being an organic chemist?
- Can I be a researcher in both of them?
- Or it's better to take organic chemistry if I want to be a researcher? |
What's the future of an organic and/or analytical chemist? |
Suppose that I take a pressure vessel that can withstand up to 2000 PSI. Now I fill it with water (not completely, but around 90%) and start to heat it with a direct flame. What I want to know is, what will happen?
Although I don't know anything about it, here are some guesses that I think might happen:
1. The w... |
Good question... would a *plasma* qualify? Metallic luster is due to a sea of electrons, free to move and to reflect (well, re-radiate) incident radiation. A plasma can be created in a gas, such as the interstellar medium, or in Earth's atmosphere. The [Kennelly-Heaviside layer][1] is such a "shiny", reflective layer, ... |
I'd like to produce a synthetic version of foot odor for joke purposes. My company sells novelties. What could I use to create something virtually identical. Would simply mixing the correct proportions of 3-Methylbutanoic acid, Propionic acid, Butyric acid & Methanethiol do it? Would I need Ammonia? I found this:
h... |
What specifically makes oceanic desalination so expensive? |
What makes oceanic desalination so expensive? |
I'd like to produce a synthetic version of foot odor for joke purposes. My company sells novelties. What could I use to create something virtually identical. Would simply mixing the correct proportions of 3-Methylbutanoic acid, Propionic acid, Butyric acid & Methanethiol do it? Would I need Ammonia? (I found [this](... |
[Polytetrafluoroethylene][1] was discovered by accident. It now is an important material in the industry mainly because of its extremely high bonding energy, which prevents corrosion , halts reaction, and reduces friction (yea [carbon-fluorine bonds!][2])
And people definitely put it to the test, making it contain s... |
Is there ANY chemical that can destroy PTFE, or Teflon? |
[Polytetrafluoroethylene][1] was discovered by accident. It now is an important material in the industry mainly because of its extremely high bonding energy, which prevents corrosion , halts reaction, and reduces friction (yea [carbon-fluorine bonds!][2])
And people definitely put it to the test, making it contain s... |
Corrosion Resistant Products, Ltd., with the help of Dupont, has established [this source of information][1] on what can and cannot eat teflon.
Here's a list:
- Sodium and potassium metal - these reduce and defluorinate PTFE, which finds use in etching PTFE
- Finely divided metal powders, like aluminum and and... |
[Polytetrafluoroethylene][1] was discovered by accident. It now is an important material in the industry mainly because of its extremely high bonding energy, which prevents corrosion , halts reaction, and reduces friction (yea [carbon-fluorine bonds!][2])
And people definitely put it to the test, making it contain s... |
Just to add a bit to Ben's excellent answer...
- A number of fluorinating agents also react with PTFE, $\ce{XeF2}$ and $\ce{CoF3}$ being examples
- Ben mentioned the reaction of magnesium metal. Typically with metals they must be in intimate contact with the PTFE surface, so molten metals or metals dissolved in ... |
Just to add a bit to Ben's excellent answer...
- A number of fluorinating agents also react with PTFE, $\ce{XeF2}$ and $\ce{CoF3}$ being examples
- Ben mentioned the reaction of magnesium metal. Typically with metals they must be in intimate contact with the PTFE surface, so molten metals or metals dissolved in ... |
Common saying. <br>**Ultra hardness,** (*10 on Moh's scale; 10000 HV on Vicker's Hard Test (iron merely 30-80))*<br> **hyper thermal conductivity,** (*2320 W*$m^{-1}$*$K^{-1}$, or over ten times better than the heatsink <br>in your computer!*) <br>**extreme pressure resistance,** *(withstands a crushing 600 gigapascals... |
Are diamonds REALLY forever? |
I asked this over at [Physics][1], but no one seemed to know, so I'll try here:
If I fill a plastic bottle with a small amount of rubbing alcohol, shake it around and hold a match to the bottle neck, I'll get a flame wooshing out of the opening. This can easily be used to propel the bottle upwards, like a rocket. I ... |
What factors are influencing a woosh rocket? |
After looking further into indigo production, I came across a related structure called [indirubin](http://wikipedia.qwika.com/de2en/Indirubin).
![indirubin][1] ![indigo][2]
............**Indirubin**........................................................**Indigo**
(is there a better way to forma... |
Why don't you just run the calculation and see for yourself (rather than forever speculating)? Do you know how to use the steam tables? Suppose the water is in a 1 liter container initially at 20 C, and the liquid takes up 90% of the volume, while water vapor in equilibrium with the liquid water at 20 C occupies the ... |
I have been studying alkanes, alkenes & alkenes for a while, and I see in the examples that all the basic structural formulas start with CH3 then CH2 and the last carbon atom is CH3 but the one that is attached to the singe/double/triple bond is CH. (Please correct me if i'm explaining it with the right terms)
Anywa... |
Nitrogen triiodide, on slightest physical contact, explodes to evolve dense purple fumes of iodine. Why does this phenomenon occur?
video link - https://www.youtube.com/watch?v=2KlAf936E90 |
I have been studying alkanes, alkenes & alkenes for a while, and I see in the examples that all the basic structural formulas start with CH3 then CH2 and the last carbon atom is CH3 but the one that is attached to the singe/double/triple bond is CH. (Please correct me if i'm explaining it with the right terms)
Anywa... |
I'm simple man who doesn't know much about anything. I just enjoy my life. Lately I like chemistry a lot. I want to learn chemistry at home. How do you recommend I do it?
Do i need to do chemical experiments to become good at chemistry?
I can learn about reactions with books. For example:
O + H2 -> H2O
... |
How to learn chemistry at home? |
> how long would it take for this super-material to convert to the stuff
> I scribble with?
No, despite the fact that James Bond said "[Diamonds are Forever][1]", that is not exactly the case. Although Bond's statement is a fair approximation of reality it is not a scientifically accurate description of reality.
... |
Just to add a bit to Ben's excellent answer...
- A number of fluorinating agents also react with PTFE, $\ce{XeF2}$ and $\ce{CoF3}$ being examples
- Ben mentioned the reaction of magnesium metal. Typically with metals they must be in intimate contact with the PTFE surface, so molten metals or metals dissolved in ... |
How do you calculate the energy required to break a bond ? Say it's a C-OH bond and I wanted to determine the heat (energy) and time it would take at that heat to break the bond. |
As extracting scorpion venom goes, how would one most effectively store and preserve Scorpion venom for future research? My thoughts are lyophilization, however I am not sure that would be the best of all methods in this case. Thoughts? |
What Method Would I Use To Preserve Scorpion Venom? |
I was helping some students today, quite successfully, until I came across this problem:
$$\ce{A <=> B + C}$$$$\ce{C + D \to E}$$ The first equation is a fast process with forward and reverse rate constants $k_+$ and $k_-$, respectively.
The second process is slow, with rate constant $k_1$.
The objectiv... |
This is an outdoors & chemistry question.
I have an old and functional water bladder, shown below. On it, there are markings that *coffee, beer, wine, hot drinks* etc. must NOT be stored inside, only water.
While I realize that wine is acidic, damaging the bladder and becoming poisonous, beer seems to me quite ... |
> Reaction of toluene at high temp gives us (o-m)toluene; whereas at normal conditions of electrphillic attack, it gives us (o-p) directing.
Why does this happen at high temp although as methyl group is activating and o-p directing? |
How does toluene react at higher temperatures and why? |
I have a macbook battery that shows as completely dead (doesn't hold the laptop on even for a second). It now started bulging, and in last week it inflated to about 50 % extra thickness, like this - I can see the inflated battery packs filled with gas.
.
The following image exists as a part of the answer.
![enter image description here][2]
But why is the following image not part of the answer?
![enter image description here][3]
Are the above... |
Silver, Gold and Platinum are amongst the best conductors of electricity, but also the amongst the most unreactive. Since electrical conductivity depends on the number of delocalized electrons, if an element gives up its electrons readily (making it highly reactive), then shouldn't that mean it will be a great electric... |
Why is it that the least reactive metals are the best electrical conductors? |
Does Deuterium Peroxide exist? Wikipedia has no reference. Also, the sites for delivery of chemicals like "Pubchem" or "Chemspider" has no reference.
In my book, a preparation of D2O2 is given,
K2S2O8 + 2D2O → 2KDSO4 +D2O2
If D2O2 exist, what is its physical properties(structure and apperarance etc.) ?
... |
Does deuterium peroxide exist? Wikipedia has no reference. Also, the sites for delivery of chemicals like "Pubchem" or "Chemspider" have no reference.
In my book, a preparation of $\ce{D2O2}$ is given,
$$\ce{K2S2O8 + 2D2O -> 2KDSO4 +D2O2}$$
If $\ce{D2O2}$ exist, what are its physical properties (structure and ... |
I have a macbook battery that shows as completely dead (doesn’t hold the laptop on even for a second). It now started bulging, and in last week it inflated to about 50 % extra thickness, like this – I can see the inflated battery packs filled with gas.
 required to break a bond say it's a C-OH bond how do you then calculate or determine the heat in °c and time it would take at that heat to break the bond? |
How to calculate the requirements for breaking a bond? |
Recently, there has been a [question by Voldemort](http://chemistry.stackexchange.com/questions/34078/the-lewis-structure-for-nco) concerning different resonance structures of $\ce{NCO-}$, requesting an explanation why one resonance structure would be more preferred than another.
There has been a little discussion o... |
I am aware that this answer does not describe a ‘chemical that can destroy PTFE’. However, since you are also asking ‘is there anything that can destroy Teflon through only chemical means?’, and in order to complete the other answers, I would like to add that PTFE can be easily destroyed by means of **radiation chemist... |
How to know if the following chemical structure of morphine is an R or S? What I basically need to know is: which chirality center do we use to make the decision?
![enter image description here][1]
[1]: https://i.stack.imgur.com/7dWoj.png |
Why in odd electron sharing molecules (like NO ) the bond containing 3 electrons is considired to be half covalent bond? |
Silver, Gold and Platinum are amongst the best conductors of electricity, but also the amongst the most unreactive. Since electrical conductivity depends on the number of delocalized electrons (along with resistivity), if an element gives up its electrons readily (making it highly reactive), then shouldn't that mean it... |
[Polytetrafluoroethylene][1] was discovered by accident. It now is an important material in the industry mainly because of its extremely high bonding energy, which prevents corrosion, halts reaction, and reduces friction (yea [carbon-fluorine bonds!][2])
And people definitely put it to the test, making it contain so... |
This is an outdoors & chemistry question.
I have an old and functional water bladder, shown below. On it, there are markings that *coffee, beer, wine, hot drinks* etc. must NOT be stored inside, only water.
While I realize that wine is acidic, damaging the bladder and becoming poisonous, beer seems to me quite ... |
"Drinking water" plastic - can I store beer in this? |
Can anyone tell me what is the difference between catenation and allotrophy? I would like the basic explanation. |
I was helping some students today, quite successfully, until I came across this problem:
$$\ce{A <=> B + C}$$$$\ce{C + D \to E}$$ The first equation is a fast process with forward and reverse rate constants $k_+$ and $k_-$, respectively.
The second process is slow, with rate constant $k_1$.
The objectiv... |
[Here][1] is the link to the page in which I don't understand the answer to the last question (Question 13). The question states:
>Draw all of the constitutional isomers and stereoisomers of compounds named
tribromocyclobutane (all structures must contain a cyclobutane ring).
The following image exists as a part o... |
Yes, $\ce{T2O}$ has been prepared and is available in significant quantity. When relatively pure, the energy released by the radioactive decay process is so intense that $\ce{T2O}$ will boil. It must be transported in a shielded, cryogenic dewar.
A significant difference between compounds containing an element bon... |
Once you have calculated the bond energy (enthalpy) required to break a bond, say it’s a $\ce{C-OH}$ bond, how do you then calculate or determine the temperature in °C and time it would take at that temperature to break the bond? |
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