Asecond-order reaction: a. is the rate-limiting step of a reaction. b. only occurs in multistep process. c. has a rate constant with units of (time)-1. d. is characterized by two molecules coming together to form a product. e. occurs when one substrate is converted into one product.

Option d is the correct answer.

Second order reaction is the chemical reaction which depends upon the concentration of two reactants.

Second order reaction is given by:

A+ B→P (Two different reactants A and B combine to form product P).

Thus, according to the definition, second order reaction is characterised by two molecules combine together to form product.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.