Water Quality B/C

sazhassan
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Re: Water Quality B/C

Postby sazhassan » April 1st, 2012, 10:04 pm

What the heck wasup with the division b water quality test?? It was so hard!!!! This is my best event I study everything and then it becomes the hardest event ever at States!!! Then we have to use the Salim nometer and got 7th percent!!! I'm freaking out because I got 7th place out of 20 teams!!!! Ahhh!! :cry: :oops: :cry: :oops: :cry: :cry: :o
My 1st season of SO:
Optics - (5th, 4th)
Water Quality - (3rd, 7th)
Compute This - (2nd, 5th)
Reach for the Stars - (1st, 2nd)
Experimental Design - (3rd, 7th)
Anatomy - (2nd, 2nd)
Team: 3rd, 4th

2013 events:
Anatomy, Reach for the Stars, water quality, meteorology, dynamic planet

cngu23
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Re: Water Quality B/C

Postby cngu23 » April 2nd, 2012, 10:39 am

sazhassan wrote:What the heck wasup with the division b water quality test?? It was so hard!!!! This is my best event I study everything and then it becomes the hardest event ever at States!!! Then we have to use the Salim nometer and got 7th percent!!! I'm freaking out because I got 7th place out of 20 teams!!!! Ahhh!! :cry: :oops: :cry: :oops: :cry: :cry: :o


Division C test wasn't that easy either, especially with the multiple choice. The multiple choice seemed way harder than the short answer.
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Re: Water Quality B/C

Postby bookworm2110 » April 2nd, 2012, 1:36 pm

silentsage wrote:Does anyone think that proctors are scared to make a solution below 3% or above 8%? I've never encountered any higher.

At my competition, we had solutions of 10%, 5%, and 1.5%. They were at least around there, because I don't know if we got them right.

sazhassan
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Re: Water Quality B/C

Postby sazhassan » April 2nd, 2012, 4:01 pm

cngu23 wrote:
sazhassan wrote:What the heck wasup with the division b water quality test?? It was so hard!!!! This is my best event I study everything and then it becomes the hardest event ever at States!!! Then we have to use the Salim nometer and got 7th percent!!! I'm freaking out because I got 7th place out of 20 teams!!!! Ahhh!! :cry: :oops: :cry: :oops: :cry: :cry: :o


Division C test wasn't that easy either, especially with the multiple choice. The multiple choice seemed way harder than the short answer.

My partner said Division C and B were the same except for one question. Wq is my best event, I got 7th. ;(
My 1st season of SO:
Optics - (5th, 4th)
Water Quality - (3rd, 7th)
Compute This - (2nd, 5th)
Reach for the Stars - (1st, 2nd)
Experimental Design - (3rd, 7th)
Anatomy - (2nd, 2nd)
Team: 3rd, 4th

2013 events:
Anatomy, Reach for the Stars, water quality, meteorology, dynamic planet

ptkid
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Re: Water Quality B/C

Postby ptkid » April 2nd, 2012, 7:39 pm

sazhassan wrote:What the heck wasup with the division b water quality test?? It was so hard!!!! This is my best event I study everything and then it becomes the hardest event ever at States!!! Then we have to use the Salim nometer and got 7th percent!!! I'm freaking out because I got 7th place out of 20 teams!!!! Ahhh!! :cry: :oops: :cry: :oops: :cry: :cry: :o


What type of questions were there? Can you list some?
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jfang1234
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Re: Water Quality B/C

Postby jfang1234 » April 7th, 2012, 10:40 am

Any in depth bug questions? I hope it focuses more on the other sections, its water quality, not entomology!!!!. lol sorry, i just hate the bug part.

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Re: Water Quality B/C

Postby silentsage » April 7th, 2012, 11:22 am

jfang1234 wrote:Any in depth bug questions? I hope it focuses more on the other sections, its water quality, not entomology!!!!. lol sorry, i just hate the bug part.

I love the bugs, but my Regional WQ had none. I find the bugs to be really easy once studied, and life is the most important indicator of water quality, so sorry, there has to be identification.
Road Scholar seems to depress everyone on my team who does it, but it's my favorite event...
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Re: Water Quality B/C

Postby alethbridge » April 10th, 2012, 9:19 pm

The problem we have found seems to be with the clay. It can dry out, change shape slightly, not seal correctly, absorb water. What I have found to be more accurate is to use different materials that are impermeable to water. I have had much more accuracy using a pipette or plastic syringe. The bulb part at the bottom I filled completely with sand (if you do not fill it completely, the air pocket will make the salinometer tip to the sides). Then, because my pipette was not long enough to keep the top above water, I plugged it with some clay and cut a straw in half and pushed the straw onto the pipette. I then taped over the edge of where the straw connects to the plastic pipette. I then started with my 0% solution and marked the line, then I mixed a 10% solution and marked the line. Then using my ruler I made a line that was 1/2 way in-between and then just experimented with eyeballing the other 4 lines in between 0 & 5 and 5 & 10 to make them equally spaced. I have tested this salinometer with other % solutions and it seems to be fairly accurate now. Here is a link of what the plastic pipette looks like (ask your science teacher if they have some!) and I used a larger straw that seemed to fit snugly. I cut the tip of the pipette somewhat to be able to pour the sand in. Hope this is helpful.

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Re: Water Quality B/C

Postby FlyingMonkey85 » April 13th, 2012, 2:03 pm

I am new to Water Quality, and had a question on the salinometer. When they ask for say a 5% salinity, is it 5 grams of salt and 95 grams of water? Or is it 5 grams of salt and 100 grams of water? Also, what salt will they be using? Non-Iodized Table Salt? Thanks in advance...
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Re: Water Quality B/C

Postby gigaboo » April 13th, 2012, 4:39 pm

FlyingMonkey85 wrote:I am new to Water Quality, and had a question on the salinometer. When they ask for say a 5% salinity, is it 5 grams of salt and 95 grams of water? Or is it 5 grams of salt and 100 grams of water? Also, what salt will they be using? Non-Iodized Table Salt? Thanks in advance...


It seems like this was confusing for a lot of people. Earlier in the thread, someone posted the answer to that question and an official rules clarification. Good luck!

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Re: Water Quality B/C

Postby FlyingMonkey85 » April 13th, 2012, 6:00 pm

Thanks gigaboo. As you can see, I am new to Scioly too. However, I did not find an answer to what kind of salt we use. Previous posts just say "NaCl". Is this the iodized salt or the non iodized? I would think non iodized as iodized salt contains minute amounts of iodine-containing salts, but the "Make a Simple Salinometer" on the Science Olympiad site shows a box of iodized salt in the first picture (I think?).
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Re: Water Quality B/C

Postby quizbowl » April 13th, 2012, 6:47 pm

FlyingMonkey85 wrote:Thanks gigaboo. As you can see, I am new to Scioly too. However, I did not find an answer to what kind of salt we use. Previous posts just say "NaCl". Is this the iodized salt or the non iodized? I would think non iodized as iodized salt contains minute amounts of iodine-containing salts, but the "Make a Simple Salinometer" on the Science Olympiad site shows a box of iodized salt in the first picture (I think?).

To be honest, it does not matter at all. While there are some "iodine-containing salts", their presence is incredibly miniscule - they would not change the actual salinity of the water by an amount that would be detrimental to a salinometer. While yes, it is possible that it could create a slightly different salinity, but it would be affecting, at most, the hundredths digit of the percentage. Relax.
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FlyingMonkey85
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Re: Water Quality B/C

Postby FlyingMonkey85 » April 13th, 2012, 7:58 pm

Thanks! That saved me from buying extra salt that I probably won't use in the future... That hundredths digit of the percent could easily change the tenths digit when rounded, and with only .5% lenience, it could be very significant. :lol:
"It's not denial, I'm just selective about the reality I accept" -Calvin

Patar Eyevan
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Re: Water Quality B/C

Postby Patar Eyevan » April 13th, 2012, 8:58 pm

hey have you guys taken any of the practice tests on the test exchange? If so I was wondering if the answer key was right or wrong for a few questions... One of the question asked the water in which scenario has more dissolved oxygen and the answer on the key stated that high pressure and low temperature is correct. But I thought lower pressure and lower temperature meant higher DO?... and also another question asked what was the pH range of most aquatic organisms. The answer on the key was 7-9 but I thought many organisms can tolerate below pH of 7?
First year doing sci oly... so fun :)
Regionals 2012:
Fermi Questions: 1st
Water Quality: 2nd
Microbe Mission: 3rd

State 2012:
Water Quality: 5th
Microbe Mission: 2nd

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Re: Water Quality B/C

Postby Patar Eyevan » April 13th, 2012, 9:01 pm

Sorry for the double post... but also for the Macomb regionals test, one of the questions asks: what does the amount of oxygen in any body of water depend on? and the options were:

A: the amount of animals species diversity
B: the amount of plant species diversity
C: Water temperature, number of green plants, and sunlight
D: All of the above

I put C since the quality of water does not depend on species diversity, rather the species diversity represents the quality of the water. The answer on the answer key was D... can anyone clarify this?
First year doing sci oly... so fun :)
Regionals 2012:
Fermi Questions: 1st
Water Quality: 2nd
Microbe Mission: 3rd

State 2012:
Water Quality: 5th
Microbe Mission: 2nd


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