Chapter U5.107, Problem 2E

Interpretation Introduction

Interpretation: An example in which chemical reaction is used to do work is to be explained.

Concept introduction: The pairing of chemical systems with machines transforms chemical changes into useful work. The heat transferred, $q$ , from a reaction or process can be utilized in some way, or the chemical products themselves can be used.

Answer to Problem 2E

In steam engine, chemical reaction is used to do work.

Explanation of Solution

A steam engine uses combustion reaction to heat water in a cylinder with a piston. When the heat is transferred to water, the liquid changes phase to a gas than expands and moves the piston. This is a two step process as the heat from a chemical change is used to cause a physical change. The expanding gas (water vapor) does the work in this type of engine

Conclusion

Steam engine is an example where chemical reaction results work.