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redgy
Questions (26)
using L'Hospital's rule, evalutate; LIM as x->0 e^x +cos x / e^x + sin x
I'm at LIM x->0 e^x+cosx / e^x +sinx but now I at a lost
1 answer
482 views
let xy + x^2 = x find y'
1 answer
311 views
Let 4xy^3 - x^2y= 5x - 6 - x^3 where y is a differential of X. Find y' in terms of x and y.
I get: y'= -4y^3 - 2xy + 3x^2 -5 /
1 answer
446 views
How do I go from C-triple bond-C and end up with [(Z)-6 methylhept-2-enyl] benzene. I think the first step is adding NaNH3, but
0 answers
316 views
In deciding which has more entropy, would it be correct to say
s<l<g<aq or s<l<aq<g I'm thinking the second one....
1 answer
475 views
Balance each of the following redox reactions occurring in acidic aqueous solution.Express your answer as a chemical equation.
2 answers
1,739 views
Explain why methanol spontaneously evaporates in open air at 25.0 .
I know that a negative delta G means a spontanious reaction,
0 answers
1,088 views
Calculate the percent ionization of a 0.15 formic acid solution in a solution containing 0.11 potassium formate.
I have the
2 answers
3,215 views
What is the author, Andrei Codrescu, trying to saying in "A Leafy Angel?"
2 answers
487 views
This is from a "effect of pH on the solubility of Ca(OH)2" lab: If excess Ca(NO3)2 were present, what effect would it have on
1 answer
1,374 views
What chemical reaction is responsible for the endpoint observed when the NH3/NH4Cl buffer solution is titrated with HCl? Write a
3 answers
2,851 views
I'm trying to understand the meaning of Tom Dent's poem "secret messages" (for Danny Barker). What is he trying to say? I'm
1 answer
672 views
Based on their molecular structure, how can you figure out which is stronger between two oxyacids? Our textbook is really vague.
1 answer
534 views
Based on their molecular structure, why are these acids thes stronger of the two binary acids given?
HCl stronger than HF HF
2 answers
1,003 views
If the pH of a 1.00in. rainfall over 1400 miles^2 (square) is 3.20, how many kg of sulfuric acid, H2SO4 are present, assuming
1 answer
481 views
What is the pH of a solution with [H+]= 4.75 x 10^-5?
I set this up as: pH= -log[H+] =-log (4.75 x 10^-5) = 4.32 Is this the
1 answer
464 views
We titrated Sprite with 0.1051 M standard NaOH. I've ploted three different titrations and am supposed to use the titration
4 answers
997 views
Why should the volume of standard base (or acid) needed to reach the equilvalence point in a titration be more than 10.0 mL?
1 answer
386 views
find f'(x) for the following:
f(x)= cos^5(4x-19) I keep getting 20cos^4(4x-19)sin, but the answer is supposed to be
1 answer
926 views
find f'(x) for f(x) = x/(sqrtx^2+1) please show all the steps. I'm realy confused on this one. I get as far as setting it up
2 answers
505 views
For the ionization of a weak acid, HA:
a) give the expression for Ka. b) after taking the log 10 of both sides ofthe quation in
2 answers
633 views
find the pK for the following ionization constants, K=
1.8*10^-5 and 1.1*10^.2
2 answers
1,024 views
When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in
2 answers
2,385 views
When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in
1 answer
635 views
Why would it not be useful to just use pure ethanol or pure ethylene glycol as an antifreeze since their normal freezing points
0 answers
758 views
calculate the necessary amounts of solutes and solvent to make a 4l bottle of antifreeze that will have a 35 degree change in
2 answers
861 views
Answers (14)
gottem' both. thanks anyway. I'm sure I'll have more questions on down the road.
I figured out the Zinc problem, but still need some help with the other one.
Thank you so much! I see what I was doing wrong now. I need more practice with these type problems.
actually all that matters is what my instructor thinks it means
Thank you so much for ALL your help. You make it so simple and easy to understand.
nevermind. I got it. it's 2.9 x 10^6 kg. but thanks anyway
That does help greatly. Thank you so much!
Okay, thanks. The choices offered are phosphoric acid, citric acid, a oxalic. Let me make sure I'm understaning you, for example: I have an equilvenc point at 4.80mL and the pH at that point read 6.93. So I should go to 3.5 and the pH at that point is
never mind. I figured it out. That is the correct anser, I didn't carry through with the derivitives.
THANK YOU!!!!!!
Now I can. Thanks. Our labe manual is an "experiment" for next year's classes, so a lot of info has been left out in error and we have to fend for our selves. I really appreciate the help.
thank you!
Yes, it does. Thank you!
thanks
