Explain why the elements Cobalt and Nickel in the fourth period violate the original periodic law as stated by Mendeleev. GUYS PLEASE HELP I CANT AFFORD TO GET THIS WRONG ITS MY LAST TEST PLEASE!!!

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

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