# Search results

1. ### Bromination and Nitration

Homework Statement 1) What other nitration products in a electrophilic nitration of benzoic acid would be formed if each reaction were carried out at a higher temperature? 2) The nitration of hydroquinone leads to a low yield of nitrohydroquinone. Propose the structure of the major product...
2. ### Is there any difference between Miscible and Soluble?

Thank you for the explainations :) That really helps!
3. ### Is there any difference between Miscible and Soluble?

Are there any differences between the terms Miscible and Soluble? I am kind of confuse between these two terms. Are they interchangeable? Thank you!
4. ### [Chemistry Lab] Isolation of Aldehyde and Carboxylic Acid

[Chemistry Lab] Cannnizzaro Reaction Hi! I am having some questions about my chemistry lab. In the lab we are given 1 of the 5 unknown aldehyde (benzaldehyde, anisaldehyde, nitrobenzaldehyde, chlorobenzaldehyde, and dimethoxybenzaldehyde) and reacts it with methanol and KOH to undergo...
5. ### [Chemistry] Calculation of Pt potential

Homework Statement Calculate the potential of a Pt electrode immersed in a solution that is 0.0263M in K2PtCl4 and 0.1492M in KCl. The answer given in 0.78 Homework Equations E = Eo - 0.05912/2 * log Q (Nernst Equation) The Attempt at a Solution We try looking at the reduction of PtCl4...
6. ### Mass balance/Charge balance

Can somebody explain how do you write a Mass Balance or Charge balance for a acid-base equilibrium? Let say, if you are given 0.01M Zn(OH)2 in a saturated NaOH solution and also given that Zn(OH)2 + 2OH- -> Zn(OH)4(2-) how would you solve the mass balance/charge balance? I really have no idea...
7. ### [Chemistry] Another electrochemistry question

so in this case, k is 1.1×10^16? cause when i try the quadratic on the internet quadratic solver, it says the answer is an imagary number....
8. ### [Chemistry] Another electrochemistry question

but since the k is such large number, [Ce4+] is going to be large too right?
9. ### [Chemistry] Another electrochemistry question

1. Homework Statement Given the following half-reactions: Ce4+ + e− → Ce3+ E° = 1.72 V Fe3+ + e− → Fe2+ E° = 0.771 V A solution is prepared by mixing 7.0 mL of 0.30 M Fe2+ with 8.0 mL of 0.12 M Ce4+. Calculate [Ce4+] in the solution. I've got the potential of a platinum electrode...
10. ### [Chemistry] Membrane Potential

[Chemistry] Another electrochemistry question Homework Statement Given the following half-reactions: Ce4+ + e− → Ce3+ E° = 1.72 V Fe3+ + e− → Fe2+ E° = 0.771 V A solution is prepared by mixing 7.0 mL of 0.30 M Fe2+ with 8.0 mL of 0.12 M Ce4+. Calculate [Ce4+] in the...
11. ### Electrochemistry question

What is the different between spontaneous reduction and spontaneous oxidation? For spontaneous reduction you need to have Ecell to be (+), then what about spontaneous oxidation? Thanks.
12. ### Questions about Diels Alder reaction

I am doing a research on Diels Alder, and I just want to know what are some of the history and applications of Diels Alder? Thank you.
13. ### PKa of phenol lab

Homework Statement I am working on a lab about pKa of phenol, and I don't understand how to do the following questions. Can someone please kindly help me?? 1) Why was the rinsing of glassware with acetone not allowed in this experiment? T/F Acetone has a UV absorption itself and causes...
14. ### PKa of Phenol

what about the ratio of phenol and phenoate? is that mean the ratio of concentration?
15. ### PKa of Phenol

please help!!!! questions on pKa of Phenol Hi, I have some questions regarding the pKa of Phenol lab that I am working on right now. 1) What would cause the absorbance curves to not go through the isosbestic point? For this one, I know that isosbestic point is not pH dependent so pH won't...
16. ### [Chemistry] How do you find the new concentration?

Homework Statement For solution A the concentration is 7.00x10^-4 mol/L. You transfer 10ml of the solution A out into a 10 dram vial and add 10mL of 0.1M HCL acid solution, and the new mixture is called solution B. What is the concentration of solution B? Homework Equations The Attempt...
17. ### I don't understand this integral

nevermind , i got it
18. ### I don't understand this integral

this is the process i got so far (x^2/2)((y^2-x^2)^(3/2))/(3/2)(-1/x^2) but one thing i don't understand, for the (-1/X^2), is this a proper intergral step?
19. ### I don't understand this integral

what about this one? how do you integrate x(y^2 - x^2)^(1/2)? my TA says the answer is (-1/3)((y^2 - x^2)^(3/2)) but i don't get where is the (-1/3) comes from....
20. ### I don't understand this integral

I don't understand for integral ysin(xy)dx = -cos(xy) for a=1 b=2. I know sin's integral is cos, but I don't understand how to eliminated the y in the left equation so it become the right equation. Please help!
21. ### Analytical Chemistry involving buffer

Homework Statement What volume of 0.200M HCl must be added to 250.0ml of 0.300M sodium mandelate to produce a buffer solution with a pH of 3.37? Homework Equations The Attempt at a Solution For 2 and 3, can I use the equation pH = pKa + log [A-/HA]? but for HCl isn't that 100%...
22. ### Need help with Trig/angle question

For example: if i have a point (1, -1) in the forth quadrant of the xy plane. How do you convert it to angle = [7(pie)/2]+2n(pie) format? i just forget how to do that part. Also, what if the answer for tan-1(angle) is not a whole #, ex: 53.1, then how do you do the conversion? Thank you.
23. ### How to calculate the comet's speed?

i got the answer, thank you so much! btw, so does that mean if for similiar questions, the M is always M of sun?
24. ### How to calculate the comet's speed?

one question, when we calculate with the K2 + U2 = K1 + U1, the M we are using, is that the mass of the sun or neptune?
25. ### How to calculate the comet's speed?

Homework Statement Comet moves around the sun in a very ellipical orbit around the sun. As it approach, in 1986, Comet Halley was 8.79x10^7km from the sun and moving with a speed of 54.6km/s. What will be the comet's speed be when it crosses Neptune's orbit in 2006? length of comet from...
26. ### Calculus-taylor series

okay so in that case -|x| < 1 is wrong right?
27. ### Calculus-taylor series

thank you so much by the way, one side question, can R be negative?
28. ### Calculus-taylor series

o..... okay so in general, if we want to know the equation for An to do the ratio test, the An equation we need is derive from the f^(n)(x) pattern right?
29. ### Calculus-taylor series

okay, i think i start to get it......what you saying is using the equation derive in part a) right?
30. ### Calculus-taylor series

but what i don't understand is, when you do the ratio test lim |An+1/An| don't you need an equation involving n? for example like n^x/(n+1)