What is happening when the reactants begin to react? select the two correct statements. [a] + [b] decrease slowly [a] + [b] decrease rapidly [a] + [b] remain constant [cd] decrease slowly [cd] increases slowly [cd] increases rapidly

[A] + [B] decrease rapidly.

[CD] increases rapidly.

Explanation:

A + B → CD,

The reaction proceeds that A reacts with B and their concentration decreases to produce CD that its concentration increases with time.

At the beginning of the reaction; the concentration of A + B decreases rapidly and the concentration of CD increases rapidly.

Kindly, see the attached image.

[A] + [B] decrease rapidly.

[CD] increases rapidly.