The rate of a chemical reaction was observed to rise with increasing temperature up to
temperature, tx. at temperatures higher than tx, however, the reverse was observed.
this may be explained by,
a. a reaction mechanism comprising of a complex set of elementary
reactions
b. a reaction kinetics limited by factors other than the rates of elementary
chemical reactions
c. a reaction running under equilibrium control
d. experimental error in the determination of the rates of reaction
e. none of the above

explanation:

detials on each model with digrams

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a