
Concept explainers
Interpretation: An exothermic process needs to be determined.
Concept introduction:
The first law of thermodynamics is given as,
Here,
q is the heat and,
w is the work done.

Answer to Problem 4STP
A is the correct option.
Explanation of Solution
An exothermic process is a process where energy flows out of the given system into the surrounding. For example, in the combustion of a match, energy flows out of the system as heat.
Endothermic process is a process in which energy flows from the surroundings into the system. For example, Water boils to form steam.
Therefore, candle wax melting is a exothermic reaction as heat is released to the surrounding in this process.
In option B, C and D there is no flow of heat from the system to the surrounding. Therefore, option B, C and D are incorrect.
Chapter 10 Solutions
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