Because you need to know what you are looking for before actually trying something so you can prevent any accidents by doing stuff at random
The answer is D. And if it is equally shared it is nonpolar covalent bond
At the constant temperatures the lighter the gas molecules, the faster the average velocity of the gas molecules.
I believe the answer is A (it was on another Brainly question as well).
Average speed in km/h:
S = D/T
T = 10/60 hrs
= 0.1667
S = 10 / 0.1667
= 59.988 km/h