PLS HELP ME PUT IS IT PURE ELEMENT OR COMPOUD ASP !

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Stage in which a star’s outer layers have started to cool and grow outward?

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?