CHEMISTRY

Q1

Why is it important to understand why carbon cycles through the ecosystems?

[removed] A.Because carbon is an essential element in all organic materials, and it is released into the atmosphere as a waste product of combustion, in the form of CO2, affecting global climates.  
[removed] B.Because carbon is an essential element, and it is released into the atmosphere as carbonic acid, which contributes to acid precipitation  
[removed] C.Because carbon is an essential element, and it is released into the atmosphere in the form of CO2, which is a primary ozone-depleting agent  
[removed] D.Because carbon is an essential element in organic materials, and it is released into the atmosphere by plants, during photosynthetic activities

Question 2 of 10 10.0 Points

Carbon dioxide is considered a greenhouse gas because it can

[removed] A.Absorb green frequencies well  
[removed] B.Absorb IR radiation well  
[removed] C.Absorb UV radiation well  
[removed] D.Because it can reflect EM radiation well

 

Question 3 of 10 10.0 Points

Why are greenhouse gasses important to life on earth?

[removed] A.Without them, the earth’s atmosphere would be too thin to support life  
[removed] B.Greenhouse gasses react with water vapor providing water solutions ideal for plant growth  
[removed] C.Without them, the earth’s average temperature would be too low to sustain life.  
[removed] D.Greenhouse gasses protect the earth from UV radiation

 

Question 4 of 10 10.0 Points

Considering that there are other more powerful greenhouse gasses in the atmosphere, why did CO2 gained so much attention in the past decades?

[removed] A.Because CO2 levels have dropped about 50ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events  
[removed] B.Because anthropogenic CO2 levels into the atmosphere have risen almost 70ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events.  
[removed] C.Because, among the greenhouse gasses, CO2 is the only compound that is strictly linked to life on earth.  
[removed] D.Because CO2 is the most stable greenhouse gas, and numerous studies indicate strong correlations between this instability and its high UV ray reflectivity

 

Q5

Plants remove carbon from the atmosphere through the process of photosynthesis. During this process, CO2 is converted into sugar, and makes up ______% of the glucose molecule.

[removed] A.50  
[removed] B.30  
[removed] C.45  
[removed] D.40  

 

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