Recent content by fish

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    Polar aprotic solvent sn2 rate

    In a Finkelstein rxn, if more acetone is added so that the total volume of the solution is doubled, would the reaction be faster or slower and by how much? Polar aprotic solvents (like acetone) increase the rate of SN2 reactions by dissolving the ionic nucleophile and yet not solvating the...
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    Cutting trees reasonably

    British Columbia (Canada) "Foresters have traditionally used the biological maturity of trees as the minimum harvesting age for planning harvesting schedules in the province. The Ministry of Forests standards arbitrarily define 120 years as the mature age for most softwood species; and 80...
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    Redox with 3 half reactions

    eq3 HBr ---> KBr K+ + HBr ---> KBr + H+ multiply eq3 by 4 so K+ will cancel 4K+ + 4HBr ---> 4KBr + 4H+ adding all three: KBrO2 + 4KI + 4HBr ---> 5KBr + 2H2O + 2I2
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    Redox with 3 half reactions

    KBrO2 + KI + HBr ---> KBr + I2 + H2O eq1 KBrO2 ---> KBr 4e- + 4H+ +KBrO2 ---> KBr + 2H2O eq2 2KI ---> I2 + 2K+ + 2e- 4KI ---> 2I2 + 4K+ + 4e- eq3 HBr ---> KBr K+ + HBr ---> KBr + H+ since the charges in eq3 are +1=+1 you don't have to multiply this equation by 4 do you...
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    What are you studying and why?

    there is also a $1 million prize for solving/proving Riemann [Broken] [Broken]
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    Musical Instruments, do you play one? I play Keyboard

    Here's a link to Brent Mason's site. It's got some sample song files from his solo CD "Hot Wired". Since his record company is no longer supporting the CD, he is going to re-record the whole thing and re-release it.
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    Musical Instruments, do you play one? I play Keyboard

    Glad you folks found the site useful. :smile: I take a simplistic approach to that. What's nice about the guitar fretboard layout, is scales (and chords) just follow the same patterns over and over, so to change key, just move the whole pattern up or down one fret at a time. (not minding any...
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    [OH-] or [H+] ?

    __________HA <------> H+ + A- initial (mol) .1 ________ 0 ___ 0 change __ -x _______ +x ___ +x final _____.1-x _______ x ___ x Ka = 10^-8 find pH of .1 mol acid since ka X 100 = 10^-6 < .1 can use initial concentration: .1-x = .1 Ka = [H+][A-]/[HA]...
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    Musical Instruments, do you play one? I play Keyboard

    I put together a guitar instruction page that covers basic theory, finger picking, alternate/open tunings, solos & scales over chord progressions and various tablatures. [Broken]
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    Greatest song in the world tribute

    THRASHER by Neil Young -------- They were hiding behind hay bales, They were planting in the full moon They had given all they had for something new But the light of day was on them, They could see the thrashers coming And the water shone like diamonds in the dew. And I was...
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    Molar conc.

    this seems to work, .30 mol/.500L = .60 M
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    Molar conc.

    If 25 mL of 12 M HCl are added to 475 mL of distilled water, what is the molar concentration of the diluted hydrochloric acid? c1v1=c2v2 25*12=475c c=.63 M HCL book has the answer as .60 M HCL Isn't the answer .63?
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    Who are your favorite movie or TV characters of all time?

    I liked Christopher Lloyd's Jim Ignatowski character from Taxi. __________________ Andy Kaufman in the wrestling match...
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    Paternity test identical twins

    Identical twins both mate with a female and produce a child. How could you determine who the father is? Identical twins result from when the zygote splits, so both twins will have the exact same DNA unless there was a mutation to the germ cells?
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    [ Photography ]

    Canon has a real good user group discussion forum: [Broken] You'll find all kinds of picture taking tips and info there. I've got a Canon Powershot A70, these are great cameras for the $ Here are some of the pics I've taken with the Canon A70. Some of the...