Question

Which of the following indicates that an exothermic reaction has taken place?

Answer 1

a change in color

release of heat and/or light energy

cooling of the surroundings

absorption of heat by the reaction

Answer 2

Exothermic reactions are chemical reactions that release heat and/or light.

The root word EXO means OUT.

So EXOthermic reactions are when heat is being given OUT.

You see?

For example, when you light a fire,
it is an exothermic reaction.

The fire gives out heat and light.