Question

Jesse has a class project. She wants to show how CO2 from the atmosphere gets converted to carbonates. What kind of process would help her depict this? photosynthesis chemical processes litterfall natural processes

Answer 1

The correct answer is A.

Photosynthesis.

 Photosynthesis is referred to as the process where plants use energy from the sun, carbon dioxide, and water to make food. Photosynthesis is largely responsible for maintaining and producing oxygen content of the atmosphere of the earth and then supplies all organic compounds and energy which is necessary for life.

 The first photosynthetic organisms which probably evolved in the history of evolution is used as reducing agents, for example, hydrogen sulfide and hydrogen.

Answer 2

Answer:

Option D, Natural Process

Explanation:

The following happens in all the below given processes -  

a) Photosynthesis – In photosynthesis, CO2 taken by plant react with water in presence of sunlight  to produce glucose and oxygen. No carbonate is formed in this process.

b) Chemical process – Chemical process are not necessarily natural process and since Jesse wants to know process of conversion of CO2 to carbonate in atmosphere, therefore this should be a natural process.  

c) Litterfall – it is related to falling of dead leaves from plant and has no relevance with carbonate formation.

d) Natural process – Natural processes helps the formation of carbonate from CO2 present in atmosphere

A series of chemical reactions are involved  

Step 1 – Carbon in atmosphere is dissolved by rain/water to form carbonic acid  

CO2 + H2O -> H2CO3 (carbonic acid)

Step 2 – Carbonic acid causes weathering of rock thereby producing bi carbonate ions

H2CO3 + H2O + silicate minerals -> HCO3- + Mineral cations + clays

Step 3  Carbonate is precipitated from bicarbonate ions

Mineral  + 2HCO3- -> MineralCO3 + CO2 + H2O

Thus, Option D is correct.