Recent content by goggles31

For example, how would you find the laplace transform of xy' in y''-xy+y=1, y(0)=1, y'(0)=2 ?

I centrifuged my sample at 9000 rpm for 30 minutes. There is a layer of sediment on the wall but if i tilt the centrifuge it comes off the wall.

Yes, I am sure. I have another sample in which I varied the concentration of precursor. It produces a peak.

I prepared zinc oxide nanoparticles by reacting zinc sulfate with sodium hydroxide and urea. Then, I centrifuged the reaction mixture to obtain the white powder and washed it with deionized water several times. I then mixed the powder with deionized water for UV-Vis. My results are a bit weird...

My notes state that the method is constructed based on the idea: yk+1=yk+∫f(x,y)dx where the integral is taken from xk to xk+1 We can estimate the integral by considering ∫f(x)dx (from xk to xk+1) =c0fk+c1fk-1 To simplify the equation, we move xk to the origin such that ∫f(x)dx (from 0 to h)...

Which one is cheaper to do if I have a reactor at 45 bar, 80C and wish to distill a substance before it enters another reactor at 15 bar, 150C?

I would appreciate it if someone could recommend something. I found a boiling point calculator by CalcTool but it doesn't seem that reliable.

I'm looking for a website that suggests chemical equations based on a single reactant and product. For example if I have C2H4 as a reactant and C2H3Cl as a product, I should get 1. C2H4 + Cl2 --> C2H3Cl + HCl 2. C2H4 + Cl2 --> C2H4Cl2 C2H4Cl2 --> C2H3Cl + HCl

Sorry I meant 2pir. Specifically the term σcosθ(2pir).

https://web.mst.edu/~numbere/CP/CHAPTER%203.htm I have trouble understanding why the length used in 3.1.1 is pir^2. My notes don't explain what length we use either.

I read that a hollow cathode lamp is preferable to a continuum light source since it emits a sharp atomic spectrum and hence the noise is lower. Could someone please explain how the noise is affected by the sharpness of the atomic lines? Also would you expect only the colours corresponding to...

Raoult's law: P = xP* , combined with Dalton's law becomes y = xP*/P Henry's law: P = kx, combined with Dalton's law becomes y = kx/P Relative volatility: y = ax/(1 + (a -1)x) Raoult's law and Henry's law are linear when temperature and pressure are kept constant. But if we vary the temperature...

I applied to product rule to Tds hence obtaining two terms.

Cv = (∂U/∂T)v = T(∂S/∂T)v I can prove this by using the Maxwell relations, but I have trouble deriving it from the first law. dU = TdS - pdV (∂U/∂T)v = T(∂S/∂T)v + ∂S(∂T/∂T)v = T(∂S/∂T)v + ∂S Is there a problem with my derivation?

What is the difference between energy and enthalpy of adsorption?