U1.3: Energy from Fuels

Question 1

State what the complete combustion of non-metals produces (using P3)

Answer 1

P4 + 5O2 –> P4O10

Question 2

State what the complete combustion of metals produces - Alkali metals are the most reactive metals (hence, using Al and Mg)

Answer 2

2Mg + O2 –> 2MgO
4Ag + O2 –> 2Ag2O

Question 3

State what the complete combustion of Organic Compounds produces (Alkanes - CH4 and Alcohols - CH3CH2OH)

Answer 3

Alkanes:
- Ch4 + O2 –> CO2 + H2O

Alcohols:
- CH3CH2OH + 3O2 –> 2Co2 + 3H2O

Question 4

State what the incomplete combustion of alcohols produces (using CH3CH2OH in somewhat limited O2 and extremely limited O2)

Answer 4

Somewhat limited O2:
- 2CH3CH2OH + 4O2 –> 4CO + 6H2O

Extremely limited O2:
- 2CH3CH2OH + 2O2 –> 4C + 6H2O

Question 5

State what the incomplete combustion of somewhat limited oxygen produces (Using C3H8)

Answer 5

C3H8 + 3/2O2 –> 3CO + 4H2O

Question 6

State what the incomplete combustion of extremely limited oxygen produces (using C3H8)

Answer 6

C3H8 + 2O2 –> 3C + 4H2O