12.Alternative chemicals introduced include chlorohydroflurocarbons and more recently hydroflurocarbons.
a) outline a reason why these are considered more desirable than previously used CFCs.
b) Unfortunately, most of the gases used to replace CFCs are a prob for a different reason. Identify this problem. (do they contribute 2 the greenhouse effect?)
13.One reason for the development of CFCs was to replace ammonia as a refrigent. They were also used as solvents,propellents and foam blowing agents.
a) Outline a property of CFCs that make them valuable for these purposes.
b) Explain why the use of CFCs for these purposes is now viewed with concern. (impact on environment???)
a) outline a reason why these are considered more desirable than previously used CFCs.
b) Unfortunately, most of the gases used to replace CFCs are a prob for a different reason. Identify this problem. (do they contribute 2 the greenhouse effect?)
13.One reason for the development of CFCs was to replace ammonia as a refrigent. They were also used as solvents,propellents and foam blowing agents.
a) Outline a property of CFCs that make them valuable for these purposes.
b) Explain why the use of CFCs for these purposes is now viewed with concern. (impact on environment???)
