Combustion & Fractional Distillation

Question 1

What is the formula for complete combustion?

Answer 1

[Hydrocarbon] + Oxygen —-> Carbon Dioxide + Water

Question 2

What are the products if oxygen and propane react?

Answer 2

Carbon Dioxide & Water

Question 3

Why are oxides of nitrogen formed in car engines?

Answer 3

The really high temperatures inside car engines are optimal for oxygen and nitrogen to react together

Question 4

What happens to sulfur that is released from burning fossil fuels in car engines?

Answer 4

Sulfur is oxidised into sulfur dioxide and dissolves in rainwater, causing acid rain.

Question 5

What happens when there isn’t enough oxygen inside a car engine?

Answer 5

Incomplete combustion

Question 6

Why isn’t bitumen used as a fuel? (2 reasons)

Answer 6

1) Has a high viscosity
2) It isn’t very flammable

Question 7

Why does diesel oil collect above heavy fuel oil in the fractionating column?

Answer 7

Diesel oil has a lower boiling point than heavy fuel oil so condenses much later.

Question 8

Why does diesel oil collect below kerosene in the fractionating column?

Answer 8

Diesel oil has a higher boiling point than kerosene so condenses much earlier.