# Search results

1. ### Nanotubes in Electric Field

Conducting carbon nanotubes align their primary axises in the direction of static electric field. Why is this? I am thinking that it's because since this is their longer axis, the gradient of the generated electric field within the nanotubes will be less than in the perpendicular case. Is this...
2. ### Outputting Voltages to a Computer

First off, I had no idea in which subforum to post this, so moderators feel free to move this if appropriate. I have an old oxygen sensor (electrode) which outputs a DC voltage ranging from 1-5 V which has no interface to a computer. So I was wondering if something like this-...
3. ### Fuel Consumed by Oil Refineries

Hi everyone, I was looking at some data from the Energy Information Association (http://www.eia.doe.gov/emeu/mecs/mecs2006/pdf/Table3_2.pdf\) about the fuel used by different industrial processes. Under the industry of "Petroleum Refining," there is a bit of natural gas and electricity used...
4. ### Pressure in a manometer

Homework Statement A mercury-filled manometer with two unequal-length arms of the same cross-sectional area is sealed off with the same pressure p in the two arms. With the temperature constant, an additional 10.0cm3 of mercury is admitted through the stopcock at the bottom. The level on the...
5. ### Percentage of Energy: Total Internal Reflection

Homework Statement A point source of light is at depth h below the surface of a large and deep lake. Show that the fraction, f, of the light energy that escapes directly form the water surface is independent of h and is given by f=0.5(1-\sqrt{1-1/n^2}) where n is the index of...
6. ### Question about the Purity of KClO3

I recently magically made some potassium chlorate via a secret process that I cannot reveal. The stuff burns with a nice lilac flame, but it tests positive for chloride ions when silver/copper nitrate is added (a white precipitate forms). The flame color, however, indicates that they are very...
7. ### Bleach Oxidation Reactions

I'm having trouble determining the products of these reactions with bleach. I know for sure that all of these reactions do occur because it's part of a lab in which we find the stoichimetric coefficients for the reactants using calorimetry. Since they don't want us to be able to balance the...
8. ### Native Species from 2 Nonnatives?

A few days ago, I watched The Wild Parrots of Telegraph Hill, a documentary about wild parrots in San Francisco. There are two different species of parrots that never come into contact with one another in the wild because they live in different parts of South America. However, these two...
9. ### Boric Acid Esters

I dissolved some boric acid into some isopropyl alcohol and when I burned the solution the flame was green. I am guessing that I am not getting triisopropyl borate and that the flame just burns green due to the presence of borate ions in solution. Adding sulfuric acid would create the ester...
10. ### Bromine from BCDMH

I am trying to isolate bromine from 1-Bromo-3-Chloro-5,5-Dimthylhydantoin (BCDMH used for pools). I would assume I could do this by passing chlorine gas through an aqueous solution but it is not soluble in water. Since this is used in pools, it must eventually dissolve/decompose so maybe then it...
11. ### Mercury Hg2+2 ion

Mercury can form Hg2+2 and Hg+2 ions. Why does mercury form Hg2+2? Are there any other "diatomic ions" like this? I assume this has to do with atomic size, but why don't zinc and cadmium behave like this? They only form Zn+2 and Cd+2.