What is the chemical name for 1 nitrogen atom,
2 hydrogen atom?

NH3 has 1 Nitrogen atom and 3 hydrogen atoms.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )