To draw a Lewis structure for a covalent compound, begin by

calculating A, the available

electrons, and N, the needed

electrons.

What is N for silicon

tetrachloride, SiCl4?

Enter

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

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?