Combustion of Alkanes(Complete)

Question 1

What is combustion?

Answer 1

An exothermic reaction producing oxygen.

Question 2

What does complete combustion always produce?

Answer 2

Water and carbon dioxide.

Question 3

Describe the relationship between the flame and chain length?

Answer 3

The longer the carbon chain, the yellower and more smoky the flame is.

Question 4

Write notes on CO.

Answer 4

CO - carbon monoxide.
It is a cumulative poison- it builds up over time.
It is colourless and odourless.
It is a neutral oxide and does not have any effect on litmus or universal indicator.

Question 5

Write the combustion equation for the following:
CH4
C2H6

Answer 5

CH4 + 2O2 = CO2 + 2H2O

C2H6 + 3.5O2 = 2CO2 + 3H2O