The illustration above represents a number of important processes in the human e

Question

The illustration above represents a number of important processes in the human environment which cycle the elements carbon and oxygen between different substances. For each of the processes A through E listed below,

Choose the number in the diagram corresponding to this process

State whether the reaction indicated is endothermic or exothermic

Write a balanced chemical reaction equation for the process

Also briefly explain the reasoning for your choices as appropriate.

A. Combustion of hydrocarbons

B. Corrosion of Iron

C. Photosynthesis

D. Refining of Iron

E. Cellular Respiration (metabolism)

Explanation / Answer

1. photosynthesis- Endothermic reaction, 6CO2+ 6H2O----------- C6H12O6+6O2

2. Cellular respiration,C6H12O6+6O2 ------------------- 6CO2+ 6H2O+ energy,Exothermic reaction

3. Rusting of iron- Exothermic reaction as it gives out heat, 4Fe+ 3O2-----2Fe2O3

4. Refining of iron , FeO+ CO-----------Fe+CO2 , exothermic reaction

5. Combustion of hydrocarbons -Exothermic reaction,Example CH4+ 2O2-------------CO2+ 2H2O

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