Based on the oxidation states of the atoms in this reaction, answer the questions. 4fe(0) + 3o2(0) → 2fe2(3+)o3(2-) how many electrons does the iron half-reaction lose? how many electrons does the oxygen half-reaction gain? what is the total number of electrons that are moved in this oxidation-reduction reaction?.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal