Can anyone please help with this?

Which is mostly likely why many scientists reject the cold fusion theory

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

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?