Saturday
July 26, 2014

Posts by yoo


Total # Posts: 25

Chemistry
calculate the ph 25.00 mL solution of 0.125 M acetic acid (Ka= 1.75 x 10^-5) after the addition of each of the following volumes of 0.100 M KOH: 10.00 mL, Vep and 35.00 mL

calculus
To find the concavity just graph it or use the first derivative and pick values greater than, or less than your critical points see if those values are positive or negative. IF positive, the graph will concave up, if negative - concave downwards. To find the points of inflecti...

bio
Supercoiling of DNA can occur (choose all that apply): A. when double stranded DNA is overwound B. when double stranded DNA is underwound C. when double stranded DNA is heated above it's Tm D. when DNA is treated with nucleases and Generally, cellular DNA is: A. Slightly u...

bio
Supercoiling of DNA can occur (choose all that apply): A. when double stranded DNA is overwound B. when double stranded DNA is underwound C. when double stranded DNA is heated above it's Tm D. when DNA is treated with nucleases and Generally, cellular DNA is: A. Slightly u...

organic chem
what are some chemical reasons that might have resulted in a lower yield of a product on a grignard reaction. Something related to grignards being very reactive and since its the limiting reagent, any reaction that destroys it will result in a hit in yield.

calc
f(x)=3x^ln(x), find f '(9). i can't find the answer :( I got 3x^lnx(((ln(lnx))/x)+ 1/lnx)

calc
f(x)=6(sin(x))^x, find f'(1). and f(x)=3x^ln(x), find f'(9). i tried these so many times and it keeps telling me that my answers are wrong :/ for the first one i did f'(1) = 6sin(1) * {ln[sin(1)] + cot(1)}., is that correct, when i put it in my calculator and put m...

chem
what other experiments or techniques can be used in replace of infrared spectroscopy

chem
rank strongest acid to weakest acid? rank strongest acid to weakest acid H3CNH2 CH3C (triple bond) CH CH2=CHCH3 H20 CH4 i tried to rank them using the Pka values but I couldn't find the pKa value of the alkyne and I thought the H3CNH2 was the strongest but it's not?

math
Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x=2y^2 , y=1 ,x=0 about the y-axis

math
A car drives down a road in such a way that its velocity ( in m/s) at time t (seconds) is v(t)=2t^1/2 +2 . Find the car's average velocity (in m/s) between t=4 and t=9. i really need help with thisss

organic chemistry
in gas chromatography, why do E1 and E2 give different peaks (areas) though it's the same compound?? dehydration of a secondary alcohol proceeds readily with the presence of strong acid and proceeds with E1 mechanisms. Removing product from chemical system at equilibrium s...

organic chemistry
dehydration of a secondary alcohol proceeds readily with the presence of strong acid and proceeds with E1 mechanisms. Removing product from chemical system at equilibrium shifts the equilibrium in the direction favoring the formation of the products. I carried out a dehydratio...

organic chemistry
so it is because acidic and basic conditions are used...but I'm still unsure how that gives different product ratios.

organic chemistry
in gas chromatography, why do E1 and E2 give different peaks (areas) though it's the same compound?? For example, for 1-butene, the percent composition is low in E1 but very high in E2.

organic chemistry
what product is formed from 1-bromo-2 methyl-cyclohexane reaction with CH3ONa and CH3OH...from a substitution reaction ...I got 1-CH3OH-2methly-cyclohexane but it's wrong. Not sure how to do it

chem
thank you!

chem
standard free energy change of -11.70 kJ mol-1. Calculate equilibrium constant for 25 degrees C. I got 7.772..and it's wrong I did -11700J/ (-2.303 x 8.314 x 298)= 2.0505277 and then e^(2.0505277)= 7.77 I don't know what I did wrong

chemistry
I did a lab about melting point. It is asking me for the purity of the compounds? How do I find it? Do I use melting points or percent yield?

english
What does relocalization within this text? what does relocalization mean within this text "A sane urbanism has to mean an intense commitment to RELOCOLIZATION, specifically to local economies. It means not spending $8 billion dollars to expand highway capacity via the Gat...

chemistry
is melting point of 120-126 C a typical range for a melting point

chemistry
for oxidation number of Fe(CO)5 I don't understand why Fe is zero

chemistry
Describe the electrolysis of an aqueous soln of KNO3

chemistry
Tarnished silver contains Ag2S. The tarnish can be removed by placing silverware in an aluminum pan containing an inert electrolyte soln, such as NaCL. Explain the electrochemical principle for this procedure, [The standard reduction potential for the half-cell reaction Ag2S(s...

chemistry
A hypothetical diprotic acid has pKa1=5 and pka2=7. Could a buffer at pH6 be prepared with this acid? If so how?

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