Recent content by Lisa...

Please, help me, I keep getting stuck on this and the question is due tomorrow. Now I have the primitive function as the one in the attachment (with x for 'r', l for 'L' and r for 'R'). I don't know how to go further...

Homework Statement Knowing that the wave function of the hydrogen atom is proportional to e-r/a0, estimate how t depends on the proton proton separation d. I need just to make a drawing of the integrand and make a reasonal approximation using my intuition (no numerical methods allowed to...

Thank you so very very much! :) Now I can finish the problem! You're great :D Oh btw and I guess that delta E can be calculated with this total work and the TOTAL q right?

On a second thought, I don't think my edit is such a brilliant idea, because then q= n Cp delta T should be 0 too for step II and IV which can't be cause heat is neaded to melt the ice/vaporize the water. I know I need densities of -30,0°C ice (solid), 0°C ice/water (solid/liquid), 100°C...

Or perhaps it is necessary to calculate w and E directly for the transition (solid) => (gas) with: w = -p \Delta V = - n R \Delta T and \Delta E = \frac{3}{2} R \Delta T (=q +w) and q= \Delta H = \frac{5}{2} \Delta T

I need to calculate q, w, \Delta E, \Delta H and \Delta S for the process of heating a sample of ice weighing 18.02 g (1 mole) from -30.0 °C to 140.0°C at constant pressure of 1 atm. Given are the temperature independent heat capacities (Cp) for solid, liquid and gaseous water: 37.5 J/K/mol...

Could you please explain how to resonate the double bond into the ring in part A5 and how BH3 & H2O2 would react, because I can't find it in my literature. To get part A2, isn't a keto-enol tautomerization a possibility? Could you please help me with the other questions, cause I really...

Hi! I've made the following assignments and I'll appreciate it if anybody of you can help me with them and correct me if my answer is wrong. Thanks a lot! A) Provide reagents that could be used to effect the transformation of 'Stof A' to each of the following compounds (1-5)...

Hi Patrick! Today in college I've checked it with my professor. He immediately confessed the word force should be replaced by potential as you suggested. So I've done a Taylor expansion on L= E - sqrt{E^2 + U ^2} Using U << E the Taylor series are: L(U)= L(0) + \frac{1}{1!}...

I've checked my notes and the only thing my prof told me about this, is that he mentioned the Lennard Jones potential. It shows that at a short distance the potential is proportional to 1/r12 (molecules are close to one another and repulse each other), though at large distances it goes with...

Oh and as for: The *minus* derivative of: E - sqrt{E^2+ (\frac{1}{4 \pi \epsilon_0 z^3} \mu_1 \mu_2)^2} would be \frac{-3 \mu_1^2 \mu_2^2}{8 \pi^2 \epsilon_0^2 z^7} \frac{1}{2 sqrt{E^2 + \frac{\mu_1^2 \mu_2^2}{16 \pi^2 \epsilon_0^2 z^6}}} assuming E is independent of z (is...

So I have A= \left(\begin{array}{cc}0&U\\U&2E\end{array}\right) B= \left(\begin{array}{cc}E&U\\U&E\end{array}\right) (I'll use L for lambda) Eigenvalues of A are found by using: det(A-LI)=0 \left(\begin{array}{cc}-L&U\\U&2E-L\end{array}\right) = 0 L2 - 2EL -U2 =0...

Hey! My teacher gave me a very challenging problem on QM. I've only had one introductiary course, but he said he wanted me to figure this problem out by using whatever resources, so now I turn to you guys ;-). The problem is the following: London attraction forces can be thought of as...

This is what I've done. Please tell me if I've done it okay, cause I need to deliver it in 2 hours...: V= IR, so Vin= IZ = I \sqrt{R^2 + (wl - \frac{1}{wc})^2} Vin= IR \sqrt{1 + (\frac{wl - 1/wc}{R})^2} so \frac{(wl - 1/wc)}{R} = + or - 1 to give sqrt(2) \frac{wl}{R} -...

Anybody?! Please... it's due to tomorrow!