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November 01, 2025, 12:23:37 pm
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Author Topic: Naved's Chemistry Questions (Units 1 & 2)  (Read 2122 times)  Share 

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naved_s9994

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Naved's Chemistry Questions (Units 1 & 2)
« on: June 11, 2009, 08:40:21 pm »
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Hey member of VN,
I wish to improve my knowledge of quality of Chemistry, and will post questions related to Units 1 & 2 (Water,Atmosphere)
over the next 4 - 6 months.

If possible then please help me!

Thanks and regards,
naved_s9994  :)
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #1 on: June 11, 2009, 08:43:57 pm »
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Why is water such a good solvent?

What is the difference between liquid and aqueous?
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TrueTears

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #2 on: June 11, 2009, 08:46:08 pm »
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Quote from: naved_s9994 on June 11, 2009, 08:43:57 pm
Why is water such a good solvent?

What is the difference between liquid and aqueous?
aq is when a substance is dissolved in a liquid.

Where as a liquid is normally pure.

Water is polar, the O-H can form hydrogen, ion-dipole bonds to many other substances.
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #3 on: June 11, 2009, 08:50:10 pm »
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                   H20
C2H5OH(l)     -->  C2H5OH(aq)     --- the addition of water,(substance), has made it aqueous?

P.S, what program can i use to type properly in chem here..?
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TrueTears

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #4 on: June 11, 2009, 08:54:48 pm »
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Yes, ethanol has a polar O-H group (hydroxy) attached, it forms hydrogen bonds with water hence it dissolves in it.

Use LaTeX.
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #5 on: June 11, 2009, 08:59:48 pm »
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Thanks truetears (once ill get more karma), im donating some each day from tday onwards to you !

Btw, for Latex, i found a link...it says its about 540MB?
Am i at the wrong place...im using windows vista, can any1 redirect me? thanks
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TrueTears

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #6 on: June 11, 2009, 09:01:39 pm »
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #7 on: June 13, 2009, 11:34:53 am »
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Do we have to know the reason behind, in Polar covalent compounds the hydrogen bonds between the molecule itself, and the molecules between the water are broken..... and then the RANDOMLY bond with eachother?
So do we have to know, why they randomly bond ?

Also, if any1 can explain the table attached
« Last Edit: June 13, 2009, 01:21:15 pm by naved_s9994 »
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Toothpaste

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #8 on: June 13, 2009, 04:39:46 pm »
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For that table, Mao, uploaded a set of notes called Confusing Chemistry Concentrations which you can find on the notes database under chemistry.

EDIT: http://notes.vcenotes.com/?step=downloader&download=63
I think direct linking works.


Basically when you see something with concentration of 5%m/v (mass/volume)
it means: 5g in 100mL

10ppm (parts per million) = 10g in 1000000g
« Last Edit: June 13, 2009, 04:49:09 pm by Toothpick »
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #9 on: June 14, 2009, 09:24:23 pm »
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ahh sweet, thanks toothpick!

thanks
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #10 on: June 15, 2009, 06:57:18 pm »
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why is it that..
When NaCl is added to water, each ion then will eventually have 6 water molecules surrounding it?
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #11 on: June 22, 2009, 07:45:44 pm »
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EFFECT of POLARITY on SOLUBILITY?
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TrueTears

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #12 on: June 22, 2009, 07:50:45 pm »
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Like dissolves Like.

So if solvent is polar, the solute is polar, then they would dissolve.

The converse is also true, if solvent is non-polar and solute is non-polar then they would also dissolve :)
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #13 on: June 22, 2009, 07:51:04 pm »
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In regards to experiment of Xylene, Water, Iodine, Pottasium Iodide
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naved_s9994

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Re: Naved's Chemistry Questions (Units 1 & 2)
« Reply #14 on: June 22, 2009, 08:23:01 pm »
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is KI3 more soluble in xylene or water?
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