A fire is an example of ________________ reaction, because heat is _____________ the system.
a
exothermic; leaving
b
exothermic; entering
c
endothermic; leaving
d
endothermic; entering
a
exothermic; leaving
A fire is an example of (a) exothermic; leaving the system.
The correct answer is:
b) exothermic; entering
To understand why, let's break down the question and the options.
The question asks for an example of a reaction and how heat affects the system. We can conclude that the system in question is experiencing a reaction, and heat is either leaving or entering the system.
In an exothermic reaction, heat is released or produced, which means heat is leaving the system. This is commonly observed in reactions that give off light or heat, such as a fire. So, option b) says the reaction is exothermic, and the heat is entering the system. This is not correct since an exothermic reaction means heat is leaving, not entering.
In an endothermic reaction, heat is absorbed or taken in, which means heat is entering the system. This is observed when a reaction feels cold to the touch or requires an input of energy. So, option d) says the reaction is endothermic, and the heat is entering the system. However, this is also incorrect because a fire is not an example of an endothermic reaction.
Therefore, the correct answer is b) exothermic; entering.