1. Although energy is not destroyed, why is it true that the flow of useful energy through an environmental system is essentially a one-way process?
2. Describe some ways in which use of energy has “resulted in many of the environmental problems now facing humankind.”
3. Compare nuclear energy to fossil fuel energy sources and defend or refute the statement, “Nuclear energy, with modern, safe, and efficient reactors, is gaining increasing attention as a reliable, environmentally friendly energy source.”
4. .What is shown by the reaction below?2{CH2O)--CO2(g) +CH4(g)
How is this process related to aerobic respiration?
5. Define cycles of matter and explain how the definition given relates to the definition of environmental chemistry
Answer of these questions are given by two parts. See given
below images,
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Answer - 4 is given below,

This is the required solutions.
1. Although energy is not destroyed, why is it true that the flow of useful energy...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...