Combustion

Question 1

Which type of combustion occurs when the oxygen supply is limited?

Answer 1

Incomplete Combustion

Question 2

Which type of combustion occurs when the oxygen supply is plentiful?

Answer 2

Complete Combustion

Question 3

What is the equation for incomplete combustion?

Answer 3

Hydrocarbon + Oxygen ——-> Carbon Monoxide + Carbon (Soot) +Water.

It DOESN”T produce BOTH carbon and carbon monoxide, only one of them.

Question 4

What is the equation for complete combustion?

Answer 4

Hydrocarbon + Oxygen ——–> Carbon Dioxide + Water

Question 5

What two indicators can we use to test for complete combustion? What will they do?

Answer 5

Cobalt Chloride Paper- Turns from blue to pink if complete combustion occurs

Limewater- Turns cloudy if Carbon Dioxide is present

Question 6

What are the various properties that are useful for evaluating the suitability of a fuel?

(Hint: TEACUPS)

Answer 6

• Toxicity
• Energy Value
• Availability
• Cost
• Use
• Pollution
• Storage

Question 7

Why does complete combustion produce more energy?

Answer 7

Because it has an unlimited supply of oxygen so it is able to oxidise all of the molecule in the hydrocarbon

Question 8

Why is carbon monoxide dangerous?

Answer 8

It is; toxic to humans, colourless and tasteless. It is also produced by household appliances