When an ice cube melts in your hand, it changes from a solid to a liquid.
H2O (s) → H2O (l)
This is an example of ________________ reaction, because heat is _____________ the system.
a
endothermic; leaving
b
endothermic; entering
c
exothermic; entering
d
exothermic; leaving
b) endothermic; entering
The correct answer is:
c
exothermic; entering
The correct answer is:
c) exothermic; entering
Explanation:
In this case, the process of an ice cube melting is an example of an exothermic reaction. An exothermic reaction releases heat energy into the surroundings. When the ice cube melts, heat energy is transferred from your hand to the ice cube, causing it to melt and change from a solid to a liquid.
To determine whether it is an endothermic or exothermic process, we analyze whether heat is entering or leaving the system. In this case, heat is entering the system (ice cube) from your hand, making it an exothermic reaction.