ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: naved_s9994 on March 06, 2010, 10:15:47 pm

Title: UV
Post by: naved_s9994 on March 06, 2010, 10:15:47 pm

Wondering why two different concentrations of the same sample,
would allow more light to pass?

Title: Re: UV
Post by: monokekie on March 06, 2010, 10:20:04 pm

er I don't really understand your question but I ll still have a go.

sample absorbs light, because atoms tend to vibrate more when light of a particular wavelenth is passed through their bonds.

if a sample has more lights passed through than the other, it means that it absorbed less light, meaning that there was less substance present, which means that its less concentrated..

Title: Re: UV
Post by: naved_s9994 on March 06, 2010, 10:22:24 pm

Okay, I get that.
On a bit of side note, does this relate in any way to density?

Title: Re: UV
Post by: monokekie on March 06, 2010, 10:28:30 pm

Density is the mass(usually for H2O in VCE) per unit of volume, which doesn't really relate to the concentration of substances present in the two samples.

Title: Re: UV
Post by: Potter on March 07, 2010, 10:14:03 pm

I just think of it as if you have a suspension. If you pass light through it, not all the light is emitted through the other side. The more substance in the suspension, the higher the 'absorption'.

Title: Re: UV
Post by: naved_s9994 on March 08, 2010, 09:38:33 am

Quote from: Potter on March 07, 2010, 10:14:03 pm

I just think of it as if you have a suspension. If you pass light through it, not all the light is emitted through the other side. The more substance in the suspension, the higher the 'absorption'.

Ahh NICE !
Thanks man!