Recent content by Hockeystar

The NaOH was removed using a separatory funnel. The only distillation that occurred was after 45mins of a reflux containing 9M H2SO4, KBr and 1-butanol.

Based on your feedback, 1-bromobutane and dibutyl ether must both be in the organic layer (Very little dibutyl ether however after distillation) . I'm still confused though. Williamson Ether Synthesis creates the ether we want to eliminate by reacting the 1-bromobutane with the alcohol in the...

Homework Statement The lab is to create 1-Bromobutane from 1-Butanol. Dibutyl ether is a side product you want to remove. Homework Equations N/A The Attempt at a Solution 9M H2SO4, KBr and 1-Butanol are refluxed for 45 mins. After distillation, you place 10 ml of cold 1M H2SO4 acid into...

Homework Statement U = [Polynomial of degree 3 such that 3p(1) = p(0)] Find the basis of U and find a linear transformation T: P3 ---> R such that U is the kernel of T.Homework Equations The Attempt at a Solution The basis part is easy. 3p(1) = p(0) 3a + 3b + 3c +d = d c= -b-a Basis ...

Homework Statement Let x be an eigenvector of A with eigenvalue \lambda and suppose x is also an eigenvector of B, corresponding to the eigenvalue \lambda2. Let C = A + B. Show that x is an eigenvector of C. What is the corresponding eigenvalue? to the eigenvalue 2 Homework Equations...

Thanks for helping me with this problem, it was train wreck for me. Even though I got the first question wrong I got the next 2 right. Finally understood that the string behaves like an open column because there are nodes on each end.

EDIT: Just edited it as you replied. The length should be 1/10L not L. The third harmonic for a closed tube is: 1/10L = 3/4\lambda \lambda= 4L/30f= vstring/\lambda f= (T/u)0.5 *1/(4L/30) f= (T/u)0.5 *(30/4L) Equate the two together: vsound/4L = (T/u)0.5 *(30/4L) T= v2u/900

Crap, it's a closed air column not an open one. Setting the frequencies together I should get: T = v2u/9L4

Sorry, I forgot to include, "What must be the tension of the string to produce the desired effect?". Thanks for correcting me on (v) sound vs. (v) string. I still need some help though. f = vsound/4L (Air Column closed Fundemental) f = 3/2L*(T/u)0.5 (String...

Homework Statement You have designed a new musical instrument of very simple construction. Your design consists of a metal tube with length L and diameter L/10. You have stretched a string of mass per unit length u across the open end of the tube. The other end of the tube is closed. To...

Thanks for the help guys :-)

Homework Statement Planet X rotates in the same manner as the earth, around an axis through its north and south poles, and is perfectly spherical. An astronaut who weighs 950.0 N on the Earth weighs 917.0 N at the north pole of Planet X and only 860.0 N at its equator. The distance from the...

I have the same question and I am stuck. How did he get 275L = 0.250m^3?

Thanks for your help just solved this question. The previous question was 0.1 M NaNO2 and 0.05 HNO2. The Ka was 4e-4. I kept on getting 3.70 to be the pH which meant [H+] was 0.0002 but the answer was 3.6e-4. EDIT. Masteringchemistry wanted we to assume their Ka value in their textbook which...

The problem is I used the HH equation in my last question and failed. Should I just use the HH equation with the acetic ion concentration being the concentration of HCl and the acetate ion concentration is just the original concentration subtract HCl concentration?