What are the steps to evaporation but without heat just evaporation steps to follow

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 ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?