Hello all.
I am performing chemistry experiments and recording the times of various observed results. What I am doing currently is performing the test several times in order to determine what result is "normal."
My goal is to determine a range as a standard by which all future tests will...
IX Resin is a cool idea.
I don't suppose it's possible to do a "homemade" resin, so in that case from where would be a good place to purchase some that can exchange typical Na and Cl ions? (hopefully not to expensive!)
Thanks.
Hello all.
I'm tutoring a high school student and am having trouble with a seemingly simple science project that was assigned: How to remove table salt from water. Having graduated as a Chemical Engineer, I said distillation! But the problem statement says you can't be that boring. Then I said...
Hello all;
I'm doing work for my job, and I've forgotten my statistics =(.
I first want to know if what I'm trying to do is possible.
I want to create a linear regression of the form Y = a * x1 + b * x2 + c.
http://imgur.com/Q4vGP" [Broken]
As you can see, there is space that is...
bad.. BAD Dorumon!! =P
sqrt(a + b) =/= a + sqrt(b)
You should have some trigonometric substitutions in your notes/textbook that involve cosine. Take a look at them, and see if they make the integrand a little nicer.
I'm not sure why you don't agree. I end up with the statement:
a X (b - c) = 0
And for that statement to hold, the following must necessarily be true:
b - c = 0
since we know that a is nonzero.
a is parallel to 2a, so taking the cross-product of two parallel vectors yields the...
Yes, that is a catch indeed.
The tube system will be a closed loop, and therefore the nitrogen or helium would act as diluents; reducing the performance of the cell.
FYI: The pressure build-up is very small, so that is not a concern. There is a gauge which reads from 0 to 5 psig, and the...
Here is the situation:
We are building a small model car (roughly 8 in wide by 18 in long) whereby hydrogen is produced in a chemical reaction, travels through some tubing to our fuel cells, which in turn powers the motor.
The issue lies in the start-up procedure; it is required to purge...
when you see a square root in your integrand, you will likely want to attempt trig substitution if there is no other obvious route.
There are 3 different trig substitutions possible based on the form under the root:
x = z * [email protected]
x = z * [email protected]
x = z * [email protected]
you should know which one to use based...
thanks for your replies.
I did some research on this topic myself and found out where some of my confusion lies.
on the site http://www.fuelcellknowledge.org/research_and_analysis/cell_performance/index.html", it does clearly say in the Gibbs and Nernst Potential document that the Nernst...
Hello, I'm doing work in Fuel Cells and am having difficulty with a simple issue; the Nernst Voltage (E) is greater than the Standard Potential (EO)
The only electrochemical reaction considered is H2 + 0.5O2 --> H2O
The Nernst equation for this reaction is
E = EO - (RT / 2F) ln (PH2O / (PH2...
Hello, I'm taking Physical Chemistry I in second year, and my prof does not have a required book for the course and everything will be based off his notes (which are very good by the way)
However, I would like a deeper understanding of the material, and the prof did recommend two books. What...
Hello, I'm taking Physical Chemistry I in second year, and my prof does not have a required book for the course and everything will be based off his notes (which are very good by the way)
However, I would like a deeper understanding of the material, and the prof did recommend two books. What...
VWR does offer what I'm looking for, however it comes at a high price
http://www.vwrcanlab.com/catalog/product/index.cgi?object_id=0008810&class_id=5005843 [Broken]
over $400 for all types of glass tubing.
Hey everybody
I'm looking to buy a set of these:
http://www.sciencelab.com/page/S/PVAR/10615/10-2410
the 5mm OD tubes that become malleable when subjected to heat (for a little project I want to do). Unfortunately, this website does not ship to Canada.
Anyone know of any brick & mortar...
You can't simply say Harvard>UofT always, forever and ever in everything; period.
If you have attend both universities, or did some comparison between the layout of their programs, then you could say math is better here, engineering is better there or w/e conclusion you want to draw.
That...
Prove the following statement:
\[
\sum\limits_{r + s = t} {\left( { - 1} \right)^r \left( \begin{array}{c}
n + r - 1 \\
r \\
\end{array} \right)} \left( \begin{array}{c}
m \\
s \\
\end{array} \right) = \left( \begin{array}{c}
m - n \\
t \\
\end{array} \right)
\]
Any initial...
As a general rule, you can't really compare different operators together.
For example, each of the following types of operations: polynomial, trigonometric, logarithmic, exponential - if any two appear in the same equation, you can only solve it numerically.
Give me an exact solution for...
1. this isn't calculus
2. you should really explain where you got vectors a and b from.
3. why are you dotting when you should be crossing?
4. do you know the definition of area for a triangle with vertices A,B,C?
I didn't really look at your work too closely, but this way seems more obvious to me.
(tan(x) + sqrt(3))(cos(x) + 2) = 0
This is equation is factored, i.e. in the form you need to solve the problem.
Therefore, this equation equals 0 when:
1) tan(x) + sqrt(3) = 0
or
2) cos(x) + 2 = 0...