Consider the following overall reaction and its rate law: 2 a + b  2 c, rate = k [a][b]. which of the following mechanisms can be considered a possible mechanism for the reaction? i: 2 a + b  2 c (one step)ii: a + b ⇄ m (slow) iii: a + b ⇄ m (fast) m+ a  2 c (fast) m+ a  2 c (slow)a) only ib) only iic) i and iiid) ii and iiie) i, ii, and iii

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *