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forum.virtualchallengemeets.com • View topic - 2008 B

2008 B

Two hours? That's <EM>PLENTY</EM> of time.

2008 B

Postby sxk1693 » Sat Feb 02, 2013 7:44 pm

For the bio questions, can you tell me where to study these type of info:
14, 15, and 19.

Chem
28?????? How is it not 5p?
31. Got it right, but why is there a random non-chem question in the chemistry section?
33.
38. what is molal?
39.

Phys
45 & 50. How do you do these intensity questions? Any Formula? My teacher told us that Decibels were based on a logarithmic scale, but nothing else.
52. What is elastic modulus?
53. TRICKY. Got it right, but almost chose D. What is the answer if it was kinetic friction though?
56.

Thanks.
HIGHS 2013 MEETS:
NS: 220(TMSCA STATE)
CA: 232(B)
MA: 274(District)
SC: 220(A)
CS: 212(VCM1)
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Re: 2008 B

Postby sxk1693 » Sat Feb 02, 2013 7:47 pm

And nsguy, the reason I skipped 2007B is because I stopped grading it after I missed half the bio portion :) (and then I saw your 112 in bio).

This post is to announce the death of nsguy's bio portion memes. :( JKJK Weseley :)
HIGHS 2013 MEETS:
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CA: 232(B)
MA: 274(District)
SC: 220(A)
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Re: 2008 B

Postby sxk1693 » Sat Feb 02, 2013 7:48 pm

#19 especially.
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MA: 274(District)
SC: 220(A)
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Re: 2008 B

Postby darksaber21 » Sat Feb 02, 2013 7:54 pm

Those biology questions are more of you to have discovered on your own while studying for AP biology or just biology in general. Knowing Biological Autonomy might help, but it's more to separate people really, I think.


For #33, all you need to do is just figure out the partial pressures of each of the gases, then add them all up together.
Now I know the stakes, and I'm willing to show what I gots. I will see you all at state for the first and final time, so let's end the year with a bang! :)
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Re: 2008 B

Postby darksaber21 » Sat Feb 02, 2013 8:06 pm

Molality is like molarity, except that molality is the ratio of the number of moles of the substance (solute) over the total mass of the solvent.

However, for number 38, there is a neat equation for this. You basically take the constant given times the molality of the solution to obtain the change in freezing point (in this case) of the solution (times van hoff's factor). So:

[unparseable or potentially dangerous latex formula]



39 is ridiculously easy. First, find the molarity, then find the concentration of hydroxide ions (which is equal to the molarity in this case), then find pOH, then find pH.

[unparseable or potentially dangerous latex formula]


[unparseable or potentially dangerous latex formula]


[unparseable or potentially dangerous latex formula]


[unparseable or potentially dangerous latex formula]
Now I know the stakes, and I'm willing to show what I gots. I will see you all at state for the first and final time, so let's end the year with a bang! :)
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Re: 2008 B

Postby darksaber21 » Sun Feb 03, 2013 2:23 pm

For physics #53, it solely depends on what the centripetal force(s) are, what forces allow the vehicle to travel in a circle. Typically, for cars on banked curves, only two forces are involved: the normal force placed on the car by the floor and the force of static friction. Due to the nature of the way cars move, there isn't any kinetic friction involved (as no two objects are sliding against each other).

Hope that clarifies things a little more.


More to come soon...
Now I know the stakes, and I'm willing to show what I gots. I will see you all at state for the first and final time, so let's end the year with a bang! :)
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