Atoms of different elements can be identical
That is correct! Great Job High School!
It's a weak base because weak bases don't dissociate completely. If it did, then it would be a strong base.
This is a combustion reaction because it is being combined with oxygen. Then to balance you will put the number of carbons you have or 4 in front of the CO2 and then same with H2. Then you will add up the oxygen and divide it by two to get. 1, (13/2), 4, 5