Question

A chemical reaction takes place within a test tube. After the reaction, the test tube feels warmer than it did before the reaction. The reaction was:
endothermic
exothermic
ectothermic
esothermic

Answer 1

Answer: exothermic

Explanation:
In an exothermic reaction, heat energy is released.
Because the test tube feels warmer than before the reaction, it means that the reaction released heat to warm the test tube and to raise its temperature.

Answer 2

The correct answer is exothermic. An exothermic reaction is a reaction that releases heat, and therefore it transfers heat to the surroundings (in this case, the tube), making it warmer. Instead, in an endothermic reaction, the heat is absorbed by the reaction.