When the burner in a hot air balloon is turned on, the temperature of the air in the balloon causing its volume to and the balloon

a) decreases, expand, sink
b) increases, expand, rise
c) decreases, contract, rise
d) increases, contract, sink

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2

How many grams are in 68.2 molecules of br2?