Go Back   Science Forums > Physical Sciences Forums > Chemistry
Reply
 
LinkBack Thread Tools
Old 05-13-2008   #181 (permalink)
Mohit Pandey's Avatar
Questioning


Location:
Gwalior, India
 
Mohit Pandey has a spectacular aura aboutMohit Pandey has a spectacular aura aboutMohit Pandey has a spectacular aura about
 



Not Ranked  0 score     
Question Cathode Ray tube experiment

J.J thomson experiment for discovering cathode rays
Gases under normal pressure are bad conductors of electricity. But why they become good conductors when they are subjected to low pressure ?
Under low pressure, their atoms would be allowed more movement and therefore inter-molecular space would increase. So, how does it allows to current to flow? Please clear the concept of low pressure, if needed.


----------------
Chinese Proverb:He who asks is a fool for five minutes, but he who does not ask remains a fool forever.
Reply With Quote
Old 05-14-2008   #182 (permalink)
UncleAl's Avatar
Creating


Location:
Southern California, USA
 
UncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond reputeUncleAl has a reputation beyond repute
 



Not Ranked  0 score     
Re: Chemistry 101

In hard vacuum electrons freely flow down a voltage gradient once overcoming the vacuum work potential of the cathode. Under low pressure a conductive neutral plasma does not rapidly quench (second order kinetics).

If you had vapor of a stable free radical, would that be electrically conductive?


----------------
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm
Reply With Quote
Old 05-14-2008   #183 (permalink)
HydrogenBond's Avatar
Creating


 



Not Ranked  0 score     
Re: Chemistry 101

Quote:
OK. But I had asked why atomic mass, which is relative to mass of C-12 and mass number, which is found by counting the no.s of protons and neutrons, are so close?
I interpret this to mean why are protons and neutrons in roughly a one-to-one proportion, so the average atomic weight is close to this proportion? We do get a little C13, but this is not stable but decays. It often takes a solar event to make C13 from C12. If the sun suddenly stopped shining the mass of C would actually slowly go toward C12.

It appears the one neutron and one proton ratio within carbon is the most stable or at the lowest energy. What is interesting is hydrogen averages close to 1 AMU with one proton and zero neutrons. Tritium is at the other extreme with a 2 to 1 neutron to proton ratio. Everything else is in the middle, with 1 to 1 being the closest to the mass number. Hydrogen is the odd duck.
Reply With Quote
Old 05-15-2008   #184 (permalink)
Mohit Pandey's Avatar
Questioning


Location:
Gwalior, India
 
Mohit Pandey has a spectacular aura aboutMohit Pandey has a spectacular aura aboutMohit Pandey has a spectacular aura about
 



Not Ranked  0 score     
Re: Chemistry 101

Quote:
In hard vacuum electrons freely flow down a voltage gradient once overcoming the vacuum work potential of the cathode. Under low pressure a conductive neutral plasma does not rapidly quench (second order kinetics).

If you had vapor of a stable free radical, would that be electrically conductive?
Sorry, uncleAl. I am not understanding your point, especially the red ones.


----------------
Chinese Proverb:He who asks is a fool for five minutes, but he who does not ask remains a fool forever.
Reply With Quote
Old 05-15-2008   #185 (permalink)
modest's Avatar
Creating

Moderator

Location:
U.S. Midwest
 
modest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond repute
 



Not Ranked  0 score     
Re: Chemistry 101

Quote:
Originally Posted by Mohit Pandey View Post
OK. But I had asked why atomic mass, which is relative to mass of C-12 and mass number, which is found by counting the no.s of protons and neutrons, are so close?
The atomic mass is close to the nucleon number because nearly all of the mass of an atom is the protons and neutrons. Electrons don't have much mass by comparison. Since 1 amu is 1/12 C-12 this means the number of nucleons (protons plus neutrons) will come close to the atomic mass.

-modest


----------------
Reply With Quote
Old 05-17-2008   #186 (permalink)
christian_george's Avatar
Curious


 
christian_george is an unknown quantity at this point
 



Not Ranked  0 score     
Chemistry 101

I'd like to say that I am quite disappointed to a poll about the 10 greatest inventions in the planet for the past 2000 years. They should have included the microscope!

Last edited by GAHD; 05-18-2008 at 10:18 PM.. Reason: link removed, read the rules
Reply With Quote
Old 06-09-2008   #187 (permalink)
Michaelangelica's Avatar
Creating

Editor
Basic Subscription
Sponsor

Location:
North of Sydney Australia
 
Michaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond reputeMichaelangelica has a reputation beyond repute
 



Not Ranked  0 score     
Re: Chemistry 101

I know all true chemists will be horrified by this question as a chemical = a chemical =an organic chemical.

But-
I just purchased some cheep Blood and Bone for my garden ($1 a kilo)
But it says same scary things on the ingredients list for someone who wants to buy something that came from organic 'ground up cows' or whatever

EG
N (as blood bone and flesh) 5%
Phosphorus citrate soluble 3%
Phosphorus citrate insoluble 2%
Calcium as bone 10%
Calcium as rock phosphate 2%
Fine material (??) 60%
Coarse material (?) 40%

So am I getting "organic" ground up cow or not?
Reply With Quote
Old 06-09-2008   #188 (permalink)
modest's Avatar
Creating

Moderator

Location:
U.S. Midwest
 
modest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond reputemodest has a reputation beyond repute
 



Not Ranked  0 score     
Re: Chemistry 101

Nothing there is “unnatural” or scary in any way. It isn’t all biological in origin as it lists rock phosphate which literally is rock high in phosphorous. This is normal - and it says "as" rock phosphate rather than "from" rock phosphate which should mean the phosphorous was not manufactured from the rock artificial-like.

However, this is not a complete list of ingredients. It’s more a breakdown of the main components of a fertilizer. For instance, this product probably doesn’t have the cadmium that an artificial fertilizer would have. While I would think this is certainly the case and a very good thing at that - it’s impossible to say this is the situation for sure from the list above because it isn’t a comprehensive list of ingredients.

Bottom line - nothing in that list jumps out as scary.


----------------

Last edited by modest; 06-09-2008 at 11:33 AM..
Reply With Quote
Old 06-10-2008   #189 (permalink)
Mercedes Benzene's Avatar
Student

Moderator
Editor

Location:
Montgomery County, Maryland
Latest blog entry:
 
Mercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond reputeMercedes Benzene has a reputation beyond repute
Send a message via AIM to Mercedes Benzene
 



Not Ranked  0 score     
Re: Chemistry 101

Yeah, I would have to agree with modest. There isn't anything extraordinary or "scary" about that list.
Can you provide any more details?


----------------
My Hypo-blog.

"No power in the 'verse can stop me."

Moderator -- Chemistry, Biology, Watercooler, Competitions, Architecture.
Join our Facebook group
Reply With Quote
Old 06-16-2008   #190 (permalink)
Lwelson's Avatar
Curious


 
Lwelson is an unknown quantity at this point
 



Not Ranked  0 score     
Re: Chemistry 101

Hi any chance in giving me an understanding of how plastics are made? i have to do a presentation on 'plastic' and everything about it.
Many thanks
Luke
Reply With Quote
Reply

Bookmarks

Tags
101, basic, chemistry, chemistry help, questions


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old-fashion Chemistry Mercedes Benzene Chemistry 6 05-21-2006 01:36 PM
The use of applied Chemistry newbie2k6 Chemistry 1 01-17-2006 01:30 PM
chemistry dongwoneun Chemistry 1 06-02-2005 11:52 AM
Chemistry Project aznhiphopkids Science Projects and Homework 4 01-30-2005 10:17 AM
Chemistry analizer alexander Chemistry 3 01-07-2005 07:33 PM

» Advertisement
» Current Poll
Who's the sexiest man alive? Johnny Depp or Robert Pattinson?
Johnny Depp - 27.27%
3 Votes
Robert Pattinson - 0%
0 Votes
Someone else (please specify) - 45.45%
5 Votes
I'm too macho to think a guy is sexy - 27.27%
3 Votes
Total Votes: 11
You may not vote on this poll.


All times are GMT -8. The time now is 01:51 AM.

Hypography?

Hypography [n.]: A combination of "hyperlink" and "bibliography" - ie, a list of links to electronic documents. Comparable to discography and bibliography, but not cartography.

We have been online since May 2000, and aim to be the best place to find and share science-related content of all kinds.

Share the love!

Please add more science to your life. Use our RSS feeds on your blog, your portal, or your favorite feedreader!


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.3.2
Copyright © 2000-2009 Hypography
Part of the Hypography - Science for Everyone Network