Choose the options below that are true. (select all that apply) Select all that apply: a. The rate law for a given reaction can be determined from a knowledge of the rate-determining step in that reaction's mechanism.
b. The rate laws of all chemical reactions can be determined directly from their net chemical equations.
c. The rate laws of bimolecular elementary reactions are second order overall.
d. The rate law for a given reaction can be determined from its reaction mechanism,

a, c are true statements

Explanation:

First statement concludes that only the slower stage or the rate deciding phase of the reaction allows for the rate law to be calculated. This is true

The second declaration is not valid in all regards, because we can not evaluate the correct rate law by just observing the net equation. It needs to be determined experimentally.

In the third statement, most of the bimolecular reactions are second order in general, since two reactants exist. Hence, it is true

The fourth declaration is wrong. To measure the rate of each elemental phase accompanying the response, we must observe the rates

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.