3
votes
In JJ thomson's cathode ray experiment why is the effect of gravity on the electron not considered?
Various versions of Thomson's original article (Philosophical Magazine, 44, 293-316 (1897)) can be accessed freely online, for instance at Google books, or here (link liable to rot).
But you can work ...
- 20.8k
3
votes
Accepted
Tollen's Test - Clean Up
This mixture, often called "chromic acid," is a common way to clean glassware. It is a strongly oxidizing acid which reacts with most organic material, so it is able to remove most types of ...
- 832
3
votes
Storage of air and temperature sensitive reagents
Three thoughts:
As soon as you pierce the septum, it is perforated. Depending on what you aim to store in the bottle, the material of the septum and its age (not age, but what happened to the septum [...
- 28.4k
2
votes
Soil chemical Anaylsis/CAL-P
The first sample of soil has $6.57$mg $\ce{P2O5}$ in $100$ mg soil, or $65.7$ mg $\ce{P2O5}$ in $1$ kg soil. As $\ce{P2O5}$ contains $43.6$ % P, the soil contains $0.436 · 65.7$ mg P = $28.5$ mg P in $...
- 27k
2
votes
Accepted
What does it mean if a calibration curve regression doesn't cross (0,0)
I saw a couple of reports about how forcing it was bad but I was
just wondering if there was any other explanation for why my
absorbance might be so high.
You are doing emission spectroscopy (AES= ...
- 38.9k
2
votes
What's the practical use-cases of Raoult's Law?
I can think of one right away, that is estimating molecular masses of solutes. Further, making fractional distillation requires mole fractions in the gas phase to be different those in the solution ...
- 2,093
1
vote
why are there no pictures or experiments on solid ozone?
The color of liquid ozone is documented in sciencemadness.org:
Liquid diatomic oxygen, for comparison:
The color difference is similar to what we see between aquo and ammine complexes of copper, and ...
- 53.1k
1
vote
Understanding Rossini and Frandsen experiment for measuring $(\partial u/\partial P)_T$?
One form of the general virial equation of state for a real gas is $$\frac{Pv}{RT}=1+B^*(T)P+C^*(T)P^2+...$$where v is the molar volume. At low pressures, this approaches $$\frac{Pv}{RT}=1+B^*(T)P$$
...
- 13.1k
1
vote
using either 2-propanol or isopropyl alcohol for writing a report
Many compounds can have more than one systematic IUPAC name. A compound may be named correctly in two or more ways in accordance with the several methods recommended by IUPAC.
However, “isopropanol” ...
- 4,424
1
vote
Accepted
Storage of air and temperature sensitive reagents
Your question can not be easily answered. The only valid reply must be: It really depends on the individual case and the reactivity as well as physical properties.
Is your compound easy to evaporate? ...
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