Which statement describes how diffusion works

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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 : )