For each of the scenarios, identify the order with respect to the reactant, a. a⟶products the half‑life of a increases as the initial concentration of a decreases. order: a three‑fold increase in the initial concentration of a leads to a nine‑fold increase in the initial rate. order: a three‑fold increase in the initial concentration of a leads to a 1.73‑fold increase in the initial rate. order: the time required for [a] to decrease from [a]0 to [a]0/2 is equal to the time required for [a] to decrease from [a]0/2 to [a]0/4. order: the rate of decrease of [a] is a constant. order: