Question

A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens when the cleaner is added to water?
A. An endothermic chemical reaction
B. An exothermic chemical reaction
C. An endothermic physical reaction
D. An exothermic physical reaction

Answer 1

B. An exothermic chemical reaction