What effect does a catalyst have on a reaction? O A. A catalyst increases the concentrations of products.
B. A catalyst contributes energy to a reaction,
C. A catalyst speeds up the rate of a reaction.
D. A catalyst makes it possible for a reaction to happen.

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?