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Author: Subject: The Short Questions Thread (4)
CharlieA
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[*] posted on 16-11-2015 at 11:18


Looks like we both win! It's just that you are talking apples and I am talking oranges.
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TotaLDarkness
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[*] posted on 16-11-2015 at 18:27
Calcium stearate particle sizes


Question

My current university project is to try and coat paper with various calcium stearate dispersions of various particle sizes.

The general rule of thumb i know is that larger particle sizes give rise to rougher grippier furnish. HOWEVER this is not the case. i found that it is in fact the smaller particle sizes which yielded rougher furnishing to the final coated paper.

Im a bit confused. can someone help explain this?

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CharlieA
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[*] posted on 17-11-2015 at 04:56


How do you define/measure "roughness"? Your findings seem to contradict sandpaper, where the smaller the particle size, the smoother the sandpaper.
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Camroc37
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[*] posted on 17-11-2015 at 19:10


Do you have to distill HEET brand Methanol, or is it pure enough for using? I bought a couple bottles today. What are the impurities if any?



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gdflp
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[*] posted on 17-11-2015 at 19:22


Search before asking questions. It shouldn't be others job to do your own research.
http://www.sciencemadness.org/talk/viewthread.php?tid=12831&...
http://www.sciencemadness.org/talk/viewthread.php?tid=7990
from 5 minutes of searching.
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CharlieA
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[*] posted on 18-11-2015 at 07:58
find the MSDS/SDS


Find the MSDS/SDS for the manufacturer/product you bought, to get some idea of the product's composition. Try

http://www.msdssearchengine.com
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Camroc37
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[*] posted on 18-11-2015 at 17:49


Quote: Originally posted by gdflp  
Search before asking questions. It shouldn't be others job to do your own research.
http://www.sciencemadness.org/talk/viewthread.php?tid=12831&...
http://www.sciencemadness.org/talk/viewthread.php?tid=7990
from 5 minutes of searching.

For fuck's sake.
I did search.
I can ask a question if I can't find the answer. I hate people that make a deal out of someone not being able to find an answer. This is called the fucking short question thread for a reason. I didn't go off and make a big deal of it, and I didn't force you to type a response.

[Edited on 19-11-2015 by Camroc37]

[Edited on 19-11-2015 by Camroc37]




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gdflp
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[*] posted on 18-11-2015 at 18:20


Quote: Originally posted by Camroc37  
Quote: Originally posted by gdflp  
Search before asking questions. It shouldn't be others job to do your own research.
http://www.sciencemadness.org/talk/viewthread.php?tid=12831&...
http://www.sciencemadness.org/talk/viewthread.php?tid=7990
from 5 minutes of searching.

For fuck's sake.
I did search.
I can ask a question if I can't find the answer. I hate people that make a deal out of someone not being able to find an answer. This is called the fucking short question thread for a reason. I didn't go off and make a big deal of it, and I didn't force you to type a response.

Well, considering that one of the links I posted was the first result from typing "HEET Methanol site:www.sciencemadness.org" into Google, I can't imagine you searched very thoroughly. This topic has been discussed many times on the forum, its not like the information is inaccessible in the least. If you're unable to find such widely posted information and need someone to search for you, what do you expect will happen if you decide to do more advanced experimenting or work in a professional environment? You certainly are not going to get others to search for you there.

Searching for information is a vital tool in chemistry, rediscovering what is already known and published is a waste of time and money. Even in "The Short Questions Thread", you're still taking the time of others to reply to your post. You're going to need to learn how to search sooner or later, that time might as well be now.
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Camroc37
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[*] posted on 18-11-2015 at 18:35


Quote: Originally posted by gdflp  
Quote: Originally posted by Camroc37  
Quote: Originally posted by gdflp  
Search before asking questions. It shouldn't be others job to do your own research.
http://www.sciencemadness.org/talk/viewthread.php?tid=12831&...
http://www.sciencemadness.org/talk/viewthread.php?tid=7990
from 5 minutes of searching.

For fuck's sake.
I did search.
I can ask a question if I can't find the answer. I hate people that make a deal out of someone not being able to find an answer. This is called the fucking short question thread for a reason. I didn't go off and make a big deal of it, and I didn't force you to type a response.

Well, considering that one of the links I posted was the first result from typing "HEET Methanol site:www.sciencemadness.org" into Google, I can't imagine you searched very thoroughly. This topic has been discussed many times on the forum, its not like the information is inaccessible in the least. If you're unable to find such widely posted information and need someone to search for you, what do you expect will happen if you decide to do more advanced experimenting or work in a professional environment? You certainly are not going to get others to search for you there.

Searching for information is a vital tool in chemistry, rediscovering what is already known and published is a waste of time and money. Even in "The Short Questions Thread", you're still taking the time of others to reply to your post. You're going to need to learn how to search sooner or later, that time might as well be now.

I do some more complicated things, and it seems like those are easier to find than the simple ones. I can't even find a source of OTC Nitric acid anywhere near me, and I've searched for hours altogether. I figured there would be something on HEET at youtube, but nothing. I read forums but prefer to see people actually doing an experiment.




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The Volatile Chemist
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[*] posted on 19-11-2015 at 10:32


Sometimes people search for things with SM's search engine. Of all the threads to ask on, this one is fine if someone hasn't UTSE.



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TheIdeanator
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[*] posted on 22-11-2015 at 11:22
Question


Can I pump gasses into a closed container with a pressure washer to achieve a chamber pressure close to the rated pressure?

I could modify the pump for cooling and I might be able to lubricate the insides, both of which are potential problems that can be addressed.
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NexusDNA
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[*] posted on 2-12-2015 at 12:21


Hi. does someone know what this glassware is for?

[Edited on 2-12-2015 by NexusDNA]

20151202_181916.jpg - 1.1MB




Bromine, definitely bromine.
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[*] posted on 2-12-2015 at 12:27


Looks like a pressure equalising addition funnel. The extra tap at the top is a nice touch although I am not sure how useful it would be most of the time.



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DraconicAcid
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[*] posted on 2-12-2015 at 12:31


We used to use something like that for solvent distillation. A large RBF below containing the solvent and drying agent, and a condensor above. Open the bottom tap to reflux the solvent over the drying agent, and close it to collect solvent. When you have enough, use a syringe through the upper tap to remove the quantity of solvent needed.



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The Volatile Chemist
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[*] posted on 2-12-2015 at 12:40


I'm pretty sure that's what it is. Perhaps a combination Strauss and Schlenk flask?



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NexusDNA
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[*] posted on 2-12-2015 at 12:50


Um, that might be it. I was thinking of a dropping funnel for inert atmosphere. The long neck at the top is intriguing.



Bromine, definitely bromine.
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[*] posted on 2-12-2015 at 13:04


What about an inert atmosphere chromatography reservoir?



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Yttrium2
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[*] posted on 2-12-2015 at 14:27


What happens when you drink an isoosmatic solution? Will this prevent the leaching of minerals?

Is it harmful to drink saltwater to go to the bathroom?

What would be an example of a semi permeable membrane for an osmotic pressure experiment?

How are most, or all metal ions turned to metals?

We did an experiment in class where we measured the energy required to break 2 of the H's off of H2SO4, what is this energy called? sulfuric is diprotic, quantity of energy required to release second proton, what is this called?

what are all these terms? I feel like I am missing one, there is inversely proportional, linear... ect.. What are the rest?

How come glass is amphorous and not crystalline?

How can lithium be an exception to the octet rule? I read in my book that lithium is an exception, along with beryllium, how are these exceptions?

Why does ozone accelerate the weathering of rubber?

How are heats of vaporization temperature dependent?

Partial pressure and atmospheric pressure change. How does atmospheric pressure affect partial pressure? Can someone explain partial pressure and what it is used for? I am having a hard time understanding it

Why does water efficiently absorb microwaves when microwaves wavelength is long and its energy per photon is lower?

Why does the emission spectra for neon light have so many colored bonds when there are only a few energy levels? - I mean how come when a photon is released from an electron falling from N3 to n1, how come a single color isn't released?
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[*] posted on 2-12-2015 at 14:52


Quote: Originally posted by Yttrium2  
What happens when you drink an isoosmatic solution? Will this prevent the leaching of minerals?

No.

Quote:
Is it harmful to drink saltwater to go to the bathroom

Depends if there are any Sharks in the saltwater.

Quote:
What would be an example of a semi permeable membrane for an osmotic pressure experiment?

A ceramic Plant Pot.

Quote:
How are most, or all metal ions turned to metals?

Usually the gain of a few electrons.

Quote:
We did an experiment in class where we measured the energy required to break 2 of the H's off of H2SO4, what is this energy called?

Disassociation enthalpy.

Quote:
sulfuric is diprotic, quantity of energy required to release second proton, what is this called?

Disassociation enthalpy.

Quote:
what are all these terms? I feel like I am missing one, there is inversely proportional, linear... ect.. What are the rest?

Fred, Jim and Shelia.
This answer is equally as valid as the question.

Quote:
How come glass is amphorous and not crystalline?

It's still a liquid, just really really slow.

Quote:
How can lithium be an exception to the octet rule? I read in my book that lithium is an exception, along with beryllium, how are these exceptions?

Orbitals. It's all about orbitals not just the rule-of-8.

Quote:
Why does ozone accelerate the weathering of rubber

Oxidation of the organic polymer.
Think about what 'Weathering' means.

Quote:
How are heats of vaporization temperature dependent

Nobody knows apart from zts16 and he's not saying.

Quote:
Partial pressure and atmospheric pressure change. How does atmospheric pressure affect partial pressure? Can someone explain partial pressure and what it is used for? I am having a hard time understanding it

Google Pitot Tube.

Quote:
Why does water efficiently absorb microwaves when microwaves wavelength is long and its energy per photon is lower?

They're not long enough to be outside that absobtion spectrum of water.

Quote:
Why does the emission spectra for neon light have so many colored bonds when there are only a few energy levels? - I mean how come when a photon is released from an electron falling from N3 to n1, how come a single color isn't released?

The same electron can be in one of several energy/spin states.

Check out the Quantum thread.

Please check on self-medication schedules, and if they have been observed or not.




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Metacelsus
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[*] posted on 2-12-2015 at 15:36


Pitot tubes are for measuring stagnation pressure of a flowing fluid, which is different than partial pressure of a gas.

[Edited on 12-2-2015 by Cheddite Cheese]




As below, so above.
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[*] posted on 2-12-2015 at 15:42


Ah yes. Quite So.

Please point the questioner in the Correct direction.




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Yttrium2
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[*] posted on 2-12-2015 at 15:49


Speaking of the right direction, would you care to elaborate a little on those answers Aga?

Here is a question I found interesting, it says it requires a special procedure. Can someone identify what special procedure they are referring to?20151202_154356.jpg - 96kB
windows 7 print screen
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Etaoin Shrdlu
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[*] posted on 2-12-2015 at 15:52


Great question. I see no special procedure there.
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[*] posted on 2-12-2015 at 16:09


Sideways is not good for me at this time of night.

However ...

it says 3.24g Ti, 5.40g Oxide (presumably Titanium Oxide)

5.40g - 3.24g = 2.16g to account for.

3.24g of Ti @ 47.867g/mol = 0.06768 mol

We're pretty sure it's an Oxide, so what does 0.06768 mol of O weigh ?

1.08g Holy Shit !

Two of those make 2.16g : the number we want !

TiO2 is likely the right answer,so Titanium Dioxide.


[Edited on 3-12-2015 by aga]




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[*] posted on 2-12-2015 at 17:38


Quote:
Quote: Originally posted by aga  
Quote: Originally posted by Yttrium2  
How come glass is amphorous and not crystalline?

It's still a liquid, just really really slow.


No, glass is an amorphous solid. That's practically the definition of a glass.

The glass we normally think of as glass is composed of long-chain polysilicate ions, with branches, paired with a mixture of sodium, potassium, calcium and sometimes other metal cations. When you melt glass, these ions don't flow freely, because they get tangled up in each other (an ordinary liquid could be visualized by a bucket of marbles that can be stirred up. Liquid glass is more like a bucket of cooked spaghetti). When it cools down, the ions can't get past the viscosity of the liquid to form an orderly crystal lattice, they just slow down and stop where they are. So it has the same internal structure as a liquid (but isn't one).

The same is true for things like plastic sulphur and nylon- long molecules which get tangled instead of forming crystals.





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