Question

1. Consider blocks of solid water and carbon dioxide in a closed system. If the pressure is increased will the state of either change? How and why?

2. The Montreal Protocols were signed in 1987 banning chlorofluorocarbons (CFCs) to repair what? Why was it necessary to ban them?

Answer 1

 

1.In a Closed System,if the Overall Pressure inside it Increases,it will Exert a Pressure on the Substances Present in it. And this Increase in Pressure causes a Change in State of that Substance based the Molecular Packing and Structure of the Compounds.

If Pressure is Exerted on a Solid Block of Water is Increased,it's State Does not Change, because Solids are generally Incompressible in Nature due to the Tight Packing of Molecules in it.

While the Carbon Dioxide being a Gas are Highly Compressible in Nature due to the Loose Packings of the Molecules it. So if the Pressure Exerted on the CO2 Gas is Increased, it's State may Change to Liquid.

2. The Montreal Protocol were signed for Banning the use of Chlorofluorocarbons(CFCs) Emissions into the Atmosphere, because this along with Compounds like HCFCs is Responsible for the Maximum Extent of Ozone Depletion in the Atmosphere of Earth.

This Layer is a Nessesary because Ozone Layer is the Primary Source which Reduces the Levels of Harmful Radiations like UV from the entering the Earth's Atmosphere.So the Ban in the Emission of CFC is a Necessary Act.