To find moles from grams would be the amount of grams which in your case is 3.4 divided by the molar mass which is just adding ip Si, O2
A) They are different states of matter.
At the right angle. Both molecules have to be going fast enough and at the right angle or else they will just bounce off
The answer is not A because in A, two aqueous solutions(solutions which are diluted and aren’t concentrated) are reacting to produce a gas.
The number of shells increase, the energy level their outer shell have decreases as we go down wards,