For example, "Z" is the standard symbol for atomic number. I'm writing a manuscript that uses the group and period of elements within some equations, and so far I'm just denoting them as $G_{table}$ and $P_{table}$, defining them in the paragraph before the equation is presented. But there are a ...

According to this article -> http://ntrs.nasa.gov/search.jsp?R=19660041998 Lava evaporates under natural conditions, but apparently, only a little bit. I'd like to know the temperature at which lava could fully, or mostly, evaporate at 1 atm. I know this is extremely difficult, if not impos...

Unsure if this is more chemistry or physics, but here goes... Consider a Bunsen burner and the flame it produces when the air inlets are closed vs open. According to the description on the linked Wikipedia page, combustion is incomplete when the air inlets are closed, but essentially complete whe...

Among the given halides, which one can be used as halide component for Friedel–Crafts reaction? (a) Isopropyl chloride (b) Bromobenzene (c) Chlorobenzene (d) Chloroethene I don't understand what a "halide component" is. Is it the reactant that we use with existing molecule (a simple benzene rin...