Answer:
a. making popcorn in a microwave oven. Endothermic
b. a burning match. Exothermic
c. boiling water. Endothermic
d. burning rocket fuel. Exothermic
e. the reaction inside a heat pack Exothermic
Explanation:
In order to answer, we need to review the definitions of exothermic and endothermic reactions.
Exothermic reactions give out heat. They cause increase in the energy of the system.
Endothermic reactions absorb heat. They cause decrease in the energy of system.
By this definition,
a. making popcorn in a microwave oven. Endothermic as heat energy is provided to the corn which causes it to pop.
b. a burning match. Exothermic as heat energy is given out by a burning match.
c. boiling water. Endothermic as heat energy is provided to the water which causes it to boil.
d. burning rocket fuel. Exothermic as heat energy is given out by burning fuel.
e. the reaction inside a heat pack. Exothermic as reaction which takes place inside heat pack gives out heat. This heat provides comfort to painful joints and muscles.
Energy is absorbed in an endothermic reaction while energy is released in an exothermic reaction.
An exothermic process is a process in which energy is released. This implies that heat is evolved in the process. In an endothermic process, heat is absorbed in the process. We shall now classify the following process as endothermic or exothermic accordingly;
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