User:Chemicalinterest/DYK

Here are some possible DYK hooks. Some of these are complex, uncited, etc.

...that sodium (a reactive metal) reacts with chlorine (a toxic gas) to make table salt?
...that lithium will turn into a white powder if left in air for two days?
...that the red hydrated type of cobalt(II) chloride turns into the blue anhydrous type when it is heated?
...that phosphorus ignites when it is placed in bromine?
...that hydrogen is lighter than helium?
...that tin(II) oxide burns with a green flame?
...that zinc burns when in small pieces and melts when in larger pieces?
...that chlorine trifluoride can burn sand and concrete?
...that lead(II) nitrate crackles and pops when heated?
...that chromium(III) chloride can be purple or green?
...that manganese(VII) oxide can explode easily?
...that sulfur burns with a blue flame?
...that copper(II) sulfate can corrode many metals?
...that mercury is heavier than lead?
...that lithium is the lightest metal?
...that hydrogen telluride smells like decayed garlic?
...that hydrogen sulfide, the "rotten egg gas", is toxic as well as bad-smelling?
...that iridium does not react with any acid?