Please answer each of the following questions concisely
(1) Identify the following as either organic or inorganic and explain the reasoning behind your choice (2 points each; 20 points total):
carbonates
phosphates
propane
carbon monoxide
carbon dioxide
1,1-difluoroethane
dimethyl ether
water
cyclohexane
chlorine
(2)
The general public often expects solutions to our environmental issues that have zero risk.  Explain in less than 200 words whether this is possible, supporting your answer with a thoughtful discussion of what risk is and how to calculate risk. 
One can argue that both nitric oxide and sulfur dioxide are natural, and hence, harmless.  Would you agree or disagree with this statement?  Explain using the concept of equilibrium and biogeochemical cycles, and discuss their effects on natural waters. (10 points possible)
(3)  In one sentence, state the difference between past climate change and present climate change, providing both evidence and logic.  (10 points possible)
(4)  Name the top five greenhouse gases of concern. Briefly explain how each gas is responsible for extra warming.  (15 points possible)
(5) A student states that sulfates are bad for our planet because they warm the planet.  Now that you have a much greater understanding of the chemistry of various molecules, please help enlighten this student. (15 points possible) 
(6)
Is the six-membered ring system in benzene particularly stable or unstable?   Explain using chemical concepts we have discussed and read about. 
How does the type of bonding and functional groups of a molecule affect its reactivity or interactions in the environment?