2) amine is the correct answer
Answer:
36.3
Explanation:
The full answer would be 36.3426, but because of the 0.21, you round it down to 3 sig figs.
Probably the kinetic energy of rubbing the pump against the valve, combined with the increase in gas pressure in the tire itself.
Color change , temp. change ,if a solid forms , umm there's probably more but that's all I remember
