Final answer:
The true statement is that a rate law must be determined experimentally (a); it reflects the relationship between reaction rate and reactant concentrations and cannot be deduced solely from a chemical equation.
Step-by-step explanation:
The correct statement regarding rate laws in chemical reactions is: a) A rate law for any particular reaction must be determined experimentally. This is because the rate law is an expression that shows the relationship between the reaction rate and the concentrations of each reactant, and it cannot be deduced solely from the stoichiometry of the balanced chemical equation. The specific rate constant (k), which is part of the rate law, varies with conditions such as temperature and pressure, and its value must be experimentally determined. It is incorrect to say that a rate law changes only if the temperature increases (b), that the value of k is independent of temperature (c), or that a rate law can be predicted by the coefficients of a chemical equation (d).