Answer asap please!! Which of the following scenarios would result in the LEAST amount of friction?
A. A box being pushed across a gravel driveway
B. An ice skater gliding across the ice
C. The breaks on a car being applied
D. A paratrooper coming back down to earth with a parachute

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

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?