What does the empirical formula of a compound represent?

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

Why does his teacher ask him to balance the equation by including the correct coefficient

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