Chem Lab C

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Chem Lab C

Postby Jim_R » Sun Aug 10, 2014 5:46 pm

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Re: Chem Lab C

Postby 09821qh » Mon Sep 15, 2014 1:27 am

Who's excited for this event!? Do any of you know what to expect for kinetics :roll:

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Re: Chem Lab C

Postby computergeek3 » Wed Sep 17, 2014 4:12 am

09821qh wrote:Who's excited for this event!? Do any of you know what to expect for kinetics :roll:


What I would expect for kinetics is determining reaction order (0 order, 1st order, 2nd order) and determining rates of reactions. Additionally, I would expect to find questions about figuring out the rate-determining step of a system of reactions and how that affects the rate of the overall reaction. Any AP/IB textbook should have further explanations of all of that stuff!
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Re: Chem Lab C

Postby 09821qh » Thu Sep 18, 2014 10:57 pm

Thank you! Also, according to the rules, I think determining rate laws will only be for state and national level but just to be safe, I'll be sure to practice them anyway :D

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Re: Chem Lab C

Postby Crazy Puny Man » Fri Sep 19, 2014 3:38 am

09821qh wrote:Thank you! Also, according to the rules, I think determining rate laws will only be for state and national level but just to be safe, I'll be sure to practice them anyway :D


I don't even think determining rate laws is the hardest part of kinetics, so that part puzzles me...

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Re: Chem Lab C

Postby mej710 » Sun Sep 21, 2014 3:47 pm

What are the topics for this year?

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Re: Chem Lab C

Postby XJcwolfyX » Mon Sep 22, 2014 1:31 pm

stoich and kinetics
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Re: Chem Lab C

Postby SWAnG » Sun Nov 30, 2014 7:17 pm

For exponents and logarithims there is a special rule for sig figs. Are we expected to utilize this or not?

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Re: Chem Lab C

Postby chalker » Mon Dec 01, 2014 12:07 am

SWAnG wrote:For exponents and logarithims there is a special rule for sig figs. Are we expected to utilize this or not?



SO has an official SigFig policy on the website at: http://soinc.org/sites/default/files/up ... 2-5-12.pdf

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Re: Chem Lab C

Postby SWAnG » Mon Dec 01, 2014 12:43 am

chalker wrote:
SWAnG wrote:For exponents and logarithims there is a special rule for sig figs. Are we expected to utilize this or not?



SO has an official SigFig policy on the website at: http://soinc.org/sites/default/files/up ... 2-5-12.pdf


Thanks! I'm assuming we use the multiplication/division rules for exponents and logarithms then?

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Re: Chem Lab C

Postby bernard » Tue Dec 02, 2014 4:07 pm

SWAnG wrote:
chalker wrote:
SWAnG wrote:For exponents and logarithims there is a special rule for sig figs. Are we expected to utilize this or not?

SO has an official SigFig policy on the website at: http://soinc.org/sites/default/files/up ... 2-5-12.pdf

Thanks! I'm assuming we use the multiplication/division rules for exponents and logarithms then?

Take a look at this link. It does a good job of explaining why the significant figure rules are the way they are. However, I cannot say that these rules are "official" since they are not on the Official Science Olympiad website.

Significant Figure Rules for Logarithms: When you take the log of a number with N significant figures, the result should have N decimal places. The number in front of the decimal place indicates only the order of magnitude. It is not a significant figure.

Significant Figure Rules for Exponents: When raising 10 to a power: If the power of 10 has N decimal places, the result should have N significant figures. The rule for raising e to a power is similar.
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Re: Chem Lab C

Postby SWAnG » Thu Dec 04, 2014 2:07 am

I agree those are the correct ways to do them. However scioly has no policy on it other than the multiplication one... And a lot of supervisors don't know the rules.

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Re: Chem Lab C

Postby Unome » Thu Dec 04, 2014 12:22 pm

SWAnG wrote:I agree those are the correct ways to do them. However scioly has no policy on it other than the multiplication one... And a lot of supervisors don't know the rules.

So even in Division C I'm going to have to ask all the supervisors about sigfigs?
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Re: Chem Lab C

Postby chalker » Thu Dec 04, 2014 12:58 pm

Unome wrote:
SWAnG wrote:I agree those are the correct ways to do them. However scioly has no policy on it other than the multiplication one... And a lot of supervisors don't know the rules.

So even in Division C I'm going to have to ask all the supervisors about sigfigs?



If you follow the rules above, I can't imagine a situation where you'd be penalized. So I'm not sure that you'd need to explicitly ask about it everytime, although you always are allowed to.

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Re: Chem Lab C

Postby Catie314 » Tue Dec 23, 2014 12:09 am

Does anyone know of common labs that are likely to be used for this event this year?
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