When the moon moves between the sun and earth and casts a shadow on earth's surface, there is a(n)
a. lunar eclipse.
b. full moon.
c. new moon.
d. solar eclipse.

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?