Chem MC help (1 Viewer)

[deswa1]

Hey guys

Can someone please explain how to work this one out?

Cheers

 

[nerdasdasd]

Hey guys

Can someone please explain how to work this one out?

Cheers

Is the answer b?

 

[barbernator]

That's a difficult one, it's either A or D but I'm guessing you already got this far. (because the Town sewage drastically increases BOD due to organic material going into the water)

I would go with A because rock discharge could increase TDS and also chemicals changing the pH.

The other reason I chose that is because I couldn't really see a reason why water running through a forest would change pH and TDS/

 

[deswa1]

Is the answer b?

No its A. And shit- I'm a retard lol- I remembered that the Success books have worked solutions so I know why now. This is their explanation in case anyone else wants to know:

"Site 1 must be the town owing to the high levels of E. coli which are found in town sewage. Site 3 must be the estuary due to the very high levels of total dissolved solids that would be found in brackish water so close to the ocean. Site 4 must be the mine site as mines often have acidic discharges"

I knew why Site 1 was town and Site 3 was estuary but I couldn't tell if 2 was the mine or forest.

 

[deswa1]

That's a difficult one, it's either A or D but I'm guessing you already got this far. (because the Town sewage drastically increases BOD due to organic material going into the water)

I would go with A because rock discharge could increase TDS and also chemicals changing the pH.

The other reason I chose that is because I couldn't really see a reason why water running through a forest would change pH and TDS/

Yeah that logic makes sense too- cheers bro

 

[nerdasdasd]

Looks like I need to revise monitoring.

 

[someth1ng]

Yeah, TDS comes from salts (and other things) due to mining.

It was funny, I read the TDS as turbity do I was like, site 3 in the mine, surely. Then I read the answers and was like, dafuq?