Question

when 50.0 g of magnesium metal reacts with hydrochloric acid, it produces magnesium chloride and hydrogen gas. the reaction releases 2500 j of heat. what type of energy change occurs in this reaction? cannot be determined because the temperature change is unknown exothermic endothermic

Explanation:

In a chemical reaction, if heat is released (as stated here, the reaction releases 2500 J of heat), the reaction is classified as exothermic. Exothermic reactions are those where energy (in the form of heat) is given out by the system to the surroundings. Endothermic reactions absorb heat, and the option about temperature change being unknown is incorrect here because the release of heat directly indicates an exothermic process.

Answer:

B. exothermic