$1)$ Much like CFCs$,$ plastics have many worthwhile chemical properties, but also have a serious downside. What is one positive and one negative to the use of plastics? $2)$Safe access to drinking water can be affected by climate change, overconsumption, and contamination. Describe one way each of these can affect potable water. $3)$The isotope I$-131$ was a great concern after the Chernobyl incident. Is it also a concern when considering the long$-$term storage of nuclear waste? Why or why not? $4)$Describe five challenges to the more widespread use of solar cells. $5)$From what you know of the Chernobyl disaster, is it likely that a similar event could happen again? Why or why not? $6)$Water has several unusual propert, name them. $7)$Distillation and reverse osmosis are ways to produce potable water from salt water or contaminated water. What is the primary downside preventing these techniques from being deployed on a wider scale? $8)$When a home is sold in Maryland, a radon test must be performed. Why does radon accumulate in basements, and what is the mechanism by which it can cause people harm $9)$ What two conditions must be met for a molecule to be polar?