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Not science as such but . . .

Started by Dave, March 04, 2017, 10:20:59 AM

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Dave

Just in case you need to convert something in a sciencey article to something you might understand the Engineering Toolbox has useful tables and formulae.

Use this thread for anything you might think a useful adjunct to understanding science.
Tomorrow is precious, don't ruin it by fouling up today.
Passed Monday 10th Dec 2018 age 74

hermes2015

Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
"Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se."
― Charles Eames

Dave

Quote from: hermes2015 on March 04, 2017, 10:54:08 AM
Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
Glad you liked it, Hermes! Thought it was worth bookmarking myself.

Didn't even know elements had electronegativities, so now I have something to look up myself!

Tomorrow is precious, don't ruin it by fouling up today.
Passed Monday 10th Dec 2018 age 74

hermes2015

Quote from: Gloucester on March 04, 2017, 12:07:24 PM
Quote from: hermes2015 on March 04, 2017, 10:54:08 AM
Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
Glad you liked it, Hermes! Thought it was worth bookmarking myself.

Didn't even know elements had electronegativities, so now I have something to look up myself!

You can think of electronegativity as a measure of how much an atom loves electrons, in other words, how strongly it attracts electrons. This can induce a dipole in a molecule that causes it to be polar, and this has a great effect on the properties of the molecule.
"Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se."
― Charles Eames

Dave

Quote from: hermes2015 on March 04, 2017, 12:59:06 PM
Quote from: Gloucester on March 04, 2017, 12:07:24 PM
Quote from: hermes2015 on March 04, 2017, 10:54:08 AM
Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
Glad you liked it, Hermes! Thought it was worth bookmarking myself.

Didn't even know elements had electronegativities, so now I have something to look up myself!

You can think of electronegativity as a measure of how much an atom loves electrons, in other words, how strongly it attracts electrons. This can induce a dipole in a molecule that causes it to be polar, and this has a great effect on the properties of the molecule.
Read the Wiki entry - well, as far as the maths anyway! I presume that is a charge dipole rather than a magnetic one?
Tomorrow is precious, don't ruin it by fouling up today.
Passed Monday 10th Dec 2018 age 74

Tank

If religions were TV channels atheism is turning the TV off.
"Religion is a culture of faith; science is a culture of doubt." ― Richard P. Feynman
'It is said that your life flashes before your eyes just before you die. That is true, it's called Life.' - Terry Pratchett
Remember, your inability to grasp science is not a valid argument against it.

hermes2015

Quote from: Gloucester on March 04, 2017, 02:08:22 PM
Quote from: hermes2015 on March 04, 2017, 12:59:06 PM
Quote from: Gloucester on March 04, 2017, 12:07:24 PM
Quote from: hermes2015 on March 04, 2017, 10:54:08 AM
Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
Glad you liked it, Hermes! Thought it was worth bookmarking myself.

Didn't even know elements had electronegativities, so now I have something to look up myself!

You can think of electronegativity as a measure of how much an atom loves electrons, in other words, how strongly it attracts electrons. This can induce a dipole in a molecule that causes it to be polar, and this has a great effect on the properties of the molecule.
Read the Wiki entry - well, as far as the maths anyway! I presume that is a charge dipole rather than a magnetic one?

You've got it. The electrons spend more time at one end of the molecule, causing a charge dipole.
"Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se."
― Charles Eames

joeactor

Cool...

If you have a WordPress site, there's a nifty converter plug-in called "Oppso":
https://tah.wordpress.org/plugins-wp/oppso-unit-converter/

You can even configure it to convert anything you'd like - I used it for Rubber Chickens (scroll down):
http://www.joesdump.com/2014/04/28/chicken-measuring/

Dave

#8
Quote from: hermes2015 on March 04, 2017, 02:18:29 PM
Quote from: Gloucester on March 04, 2017, 02:08:22 PM
Quote from: hermes2015 on March 04, 2017, 12:59:06 PM
Quote from: Gloucester on March 04, 2017, 12:07:24 PM
Quote from: hermes2015 on March 04, 2017, 10:54:08 AM
Thanks, Gloucester, that is really very useful. I could not help myself, I just had to test it by looking for electronegativities of elements. Sure enough, I found a table within one minute! I will give this link to my students.
Glad you liked it, Hermes! Thought it was worth bookmarking myself.

Didn't even know elements had electronegativities, so now I have something to look up myself!

You can think of electronegativity as a measure of how much an atom loves electrons, in other words, how strongly it attracts electrons. This can induce a dipole in a molecule that causes it to be polar, and this has a great effect on the properties of the molecule.
Read the Wiki entry - well, as far as the maths anyway! I presume that is a charge dipole rather than a magnetic one?

You've got it. The electrons spend more time at one end of the molecule, causing a charge dipole.

Can it be used for any analytical purposes?  Bit like NMR spectroscopy but different?
Tomorrow is precious, don't ruin it by fouling up today.
Passed Monday 10th Dec 2018 age 74

hermes2015

Yes, one analytical technique where we use different polarities is high performance liquid chromatography (HPLC). Separation of a mixture into its components can be achieved by fine tuning the polarities of eluting solvents and changing them over time as a gradient.
"Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se."
― Charles Eames

Dave

Quote from: hermes2015 on March 04, 2017, 04:52:56 PM
Yes, one analytical technique where we use different polarities is high performance liquid chromatography (HPLC). Separation of a mixture into its components can be achieved by fine tuning the polarities of eluting solvents and changing them over time as a gradient.

Ah, interesting. Need to look more at HPLC but got the idea - guessing it "smears" the various compounds into a sequence. Need to know wgat's in that shiny tube shown in the Wiki article.

Enough for the monent though, thanks Hermes.

Ah, found http://www.waters.com/waters/en_GB/How-Does-High-Performance-Liquid-Chromatography-Work%3F/nav.htm?cid=10049055&locale=en_GB
Tomorrow is precious, don't ruin it by fouling up today.
Passed Monday 10th Dec 2018 age 74


xSilverPhinx

Quote from: Icarus on January 19, 2018, 04:05:02 AM
Article of possible interest to xSP  https://www.npr.org/sections/health-shots/2018/01/18/578355877/repeated-head-hits-not-concussions-may-be-behind-a-type-of-chronic-brain-damage?utm_source=npr_newsletter&utm_medium=email&utm_content=20180118&utm_campaign=breakingnews&utm_term=nprnews

That is interesting, in a morbid kind of way. People are more susceptible to such brain injury than previously thought.

Since we don't have any pain receptors in the brain we can't know there's something wrong (the brain doesn't feel its own pain) unless there are other symptoms to suggest it.

QuoteThe researchers analyzed human brains — from teenagers and young adults who had been exposed to mild head impact but died from another cause soon after. They found early evidence of brain pathology consistent with what is seen in CTE, including abnormal accumulation of tau protein. CTE is a neurodegenerative disease characterized by that kind of abnormal accumulation around small blood vessels in the brain. The disease can cause brain cell death, cognitive deficits and dementia.

The accumulation of tau protein is also prevalent in Alzheimer's. I wonder how that and CTE differ. :notsure:

I am what survives if it's slain - Zack Hemsey


Icarus