Why is it more efficient to use a compact fluorescent bulb than a regular bulb?!

How air particles exert a pressure on the inside of the balloon

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

Find the mass, in grams, of 5.00*10^23 molecules of f2