In a type of chemical reaction called thermal decomposition, heat is added to a substance, which then splits apart to form several new substances. what type of chemical reaction is a thermal decomposition reaction? select one: a. endothermic b. exothermic c. organic d. synthetic

The answer is a. endothermic.
In endothermic reaction, as the name suggests, the reactants require energy absorption to form and complete the chemical reaction to form products.
And even if you don't know the answer, you can exclude all other answers by scientific logic and you will be left with the correct answer.

Hope this helps.