Fire is an example of ________________ reaction, because heat is _____________ the system.
a
endothermic; entering
b
exothermic; entering
c
endothermic; leaving
d
exothermic; leaving
b. exothermic; entering
The correct answer is b) exothermic; entering.
Explanation: In an exothermic reaction, heat is released from the system into the surroundings. Fire is an example of an exothermic reaction because it releases heat as it burns, which enters the surroundings.
The correct answer is:
b) exothermic; entering
To determine the correct answer, we need to understand the concepts of endothermic and exothermic reactions, as well as the direction of heat flow.
An endothermic reaction is a chemical reaction that absorbs heat from its surroundings. In an endothermic reaction, heat is entering the system, meaning heat is being absorbed by the reactants. This results in the surroundings becoming cooler.
On the other hand, an exothermic reaction is a chemical reaction that releases heat into its surroundings. In an exothermic reaction, heat is leaving the system, meaning heat is being released by the reactants. This results in the surroundings becoming warmer.
In the case of fire, it is an exothermic reaction because it releases heat. Heat is being transferred from the fire (the system) to its surroundings, making the surroundings warmer. Therefore, fire is an example of an exothermic reaction, and the correct answer is b) exothermic; entering.