HELP PLEASE. ASAP.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

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

The identities of substances are the same before and after which type of change