While the above answers quite clearly explain the theory, I thought I would provide some clarification and citations: If it is indeed propane you were taking the spectrum of, then you would get a ...

Reactive chemicals should be stored in chemical storage cupboards to prevent fires. I've attached an example of the type of cupboard we use in my lab to give you an idea of what I am talking about. We ...

Mass. Heavy water is noticeably heavier then light water. Simply weigh an equal amount of each water and see which weights more. Light water weights 1 g/mL (0.99700 g/mL at 25 °C) Heavy water ...

At 256 scans you should see something if your compound has reasonable concentration. The rule of thumb I was taught as an undergrad was ~10 mg of compound for a $^{13}$C scan in under a mL of solvent (...

It is indeed common, though you don't use standard borosilicate glass as I understand it. Also, it is a technique that needs special training to do right; it can be dangerous to both you and your ...

No: HCl is a very strong acid, and HBr even more so. HF is the only weak acid. This is because it binds hydrogen much more strongly then the other halides.

Make up a basebath out of conc KOH in isopropyl alcohol (Or whatever recipe you prefer). Leave it in there for an hour or two, then rinse with distilled water. Most of the time it will come out ...

No. Calculating the physical properties of materials is very, very difficult and can't simply be done from the elemental composition.