Which statement best describes a chemical change A. substance form new substance
B. the nuclei of atoms are rearranged
C. A substance changes size or phase
D. atoms are made and destroyed

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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