Recent content by colliflour

In general, the presence of suds is a good indicator of the presence of soap. Technically it is an indicator of a chemical which modifies the surface tension, many chemicals fall into this category (some sugars, etc) but mainly this category is surfactants from soap. Other components have the...

You seem to be completely missing what the phase diagram means- if you're not on a vaporization or sublimation line or melting line on the phase diagram, there are not 2 phases present there is only 1. There is no vapor over the liquid. The liquid water fills the container, no gas is present...

What do you mean, what is meant by pressure? pressure means pressure- force per unit area on the substance. The substance could be pressurized in a piston cylinder with no gas around it. If the pressure on a solid is released (vacuum created around it) it may turn to liquid or gas, moving into a...

Yes, I believe you're dealing with chlorine gas. The 409 likely lowered the pH of the bleach's buffer solution which will allow chlorine to come out of solution.

Hot water just feels soothing to the hands, which I like!

http://jb.oxfordjournals.org/content/116/2/298.short you'd likely find something like this. Diazo compounds give strong uv-vis absorbances. You'd likely end up with a huge mess of peaks with some identifiable and most others not. What is in urine is highly dependent upon food intake, so the...

Same way you take the absorbance spectra of any other sample. Get a spectrometer, read the manual, do the experiment.

1) technically, it's when the activities are the same. If the ionic atmospheres in each half cell are different, activity of the ion in question is modified and the final state may have somewhat different concentrations in each half cell (assuming copper electrodes in both for example) 2)...

Allow me to throw a wrench into the gears here. I can see some substance to BigDaddy's thinking. Two phases can coexist outside of the equilibrium line on the phase diagram, but not for long. This can be due to surface tension of the liquid, lack of nucleation sites for boiling or something...

Moran and Shapiro's Fundamentals of Engineering Thermodynamics was essentially my introduction to physical chemistry of fluids. I'm not sure what you mean by 'gas-based' but I assume you mean low molecular weight molecules undergoing physical changes. You could also consider fluid dynamics (I...

There is a common misconception that only gases are compressible. Liquids and solids do change their volume with changes in pressure. If you look at a P,T,V diagram, you'll see that the slope of the V surface for a gas is much greater than for a liquid or solid, i.e. it's more compressible. See...

First: mechanical action is the primary factor, diffusion has too long of a time scale to be relevant. Second: cold water is better for removing a surface layer of soap/dirt on the dish because cold water is more viscous so it will have a greater sheering action. On the other hand, hot water has...

http://www.pipeflowcalculations.com/airflow/ Try this. I got flow rates of 149 cfm for 1 inch long pipe for one method and 227 cfm for another method. Depends how in particular the empirical modeling for turbulent flow is done. It also depends on how slippery the inside of the pipe is. Also...

Hagen-Poiseuille equation: Q=Pi*R^4*deltaP/(8*mu*L) where Q=volumetric flow rate, R=pipe radius, deltaP=pressure difference, mu=viscosity of air(dependent on temperature as SteamKing said), L=pipe length A quick calculation at 25 degrees C gave me 4406106 cubic feet per minute with L=1 inch. so...

The emission spectra is measured as a collective effect, but each molecule has a distinct spectra and has its own microscopic sort of absorptivity and emissivity. If you take a sample of this molecule and turn it into a gas and measure the spectrum, you might actually get different values than...