Wouldn't it be electrons because that affects whether the outer shell is stable?
Not 100% sure...
Pressure affects partial motion because the higher the air pressure the more the particular bounce off the walls and each other
The products for the complete combustion of a hydrocarbon in excess air is carbon dioxide and water. Any hydrocarbon when reacted with oxygen will always yield the said products. Incomplete combustion, on the other hand, yields carbon monoxide and water.