Need with 7,9 and may you check my answer for 8 to ?

How hot is the suns corona? (integrated science)

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

Can someone me out on this question for my national 5 chemistry homework