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Re: Chem Lab C
Posted: March 11th, 2010, 4:18 am
by theproblemsolver
Masterhat, if you knew it was first order then you already knew the rate law so you did no have to determine it, or am understanding wrong?
Re: Chem Lab C
Posted: March 11th, 2010, 5:18 pm
by masterhat
theproblemsolver wrote:Masterhat, if you knew it was first order then you already knew the rate law so you did no have to determine it, or am understanding wrong?
No, pseudo-first order allows you to determine the rate by doing the initial concentration of the limiting reagent / time. Then you can plug this back in for the initial rate to determine the appropriate rate constant and exponents.
Re: Chem Lab C
Posted: March 15th, 2010, 8:16 am
by peoneill
Faythe wrote: Lolololol i did INCREDIBLE at chem lab at our invitational! (I'm being sarcastic) We drew pictures of elk and at the top we wrote that we like the judge's beard and they're our best friends. Lol. The funny thing is we didn't get last. Our team ended up getting 3rd over all which is cool though. And there were a lot of really smart teams there.
I've gotten this exact strategy (often with "Go IU!" or "We love Indiana!" or "I
Chemistry!") on a handful of chem lab exams but never in other events - and when I ran designer genes I definitely had a few teams that could do virtually nothing, but were far less excited about it. My theory: goggles make people feel good.
Re: Chem Lab C
Posted: March 23rd, 2010, 7:38 pm
by peoneill
Chem lab was AWESOME at Indiana this year. People did so well!!! I was really floored.
Re: Chem Lab C
Posted: March 23rd, 2010, 8:07 pm
by sisomg11
Now that your event supervision is over, can you share with us some of your ideas for possible labs that you described above as difficult?
Re: Chem Lab C
Posted: March 26th, 2010, 5:47 pm
by binary010101
If there is an equation involving reactants/products in both the gas and ionic (aqueous) phase, how would the equilibrium expression be written?
Re: Chem Lab C
Posted: March 26th, 2010, 6:37 pm
by starpug
binary010101 wrote:If there is an equation involving reactants/products in both the gas and ionic (aqueous) phase, how would the equilibrium expression be written?
Eh, you may need to plug stuff into the solubility equation then the equilibrium equation.
Re: Chem Lab C
Posted: June 21st, 2010, 3:27 pm
by quizbowl
so is next year still kinetics and aqueous solutions?
Re: Chem Lab C
Posted: June 21st, 2010, 3:43 pm
by starpug
quizbowl13 wrote:so is next year still kinetics and aqueous solutions?
My bet is it will be, it was only in its first year this year. Barring some massive problems we don't know about, it will be the same next year.
Re: Chem Lab C
Posted: June 23rd, 2010, 5:16 pm
by 3nv1r0nm3ntal ch3m
Starpug, I would like to congratulate you and the rest of your team on going to nationals 15 years in a row! My school has only made it to nationals once. Good job!