How many significant figures should the answer to: 1.00246+0.2400 contain

Calcium chloride +gold(1) oxide—>

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory