5. Exercises V

Answer the following questions:

 

 

GasolineFossilBiodieselNatural fuels take millions of years to be formed. They are limited in nature and cannot be replenished easily once consumed. Hence, they are considered as exhaustible physicalcombustionchemicalnatural resources. Fossil fuels take millions of years to be formed. Once consumed, they are limited in nature and cannot be replenished easily. Hence, they are considered as exhaustible natural resources.

 

 

Characteristics of coke: Coke is 98% pure carbonoxygenhydrogennitrogen. It is a tough, porous and black substance. It produces very little smoke.

Uses of coke: Coke is beneficial as fuel. It is an excellent reducing agentoxidizing agentchoking agentblister agent. It is widely used in metallurgical processes to reduce metals from their oxides. It is used for producing water gas.