3TV - Chapter 4 - Section 4.1 - Combustion

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

§4.1 Combustion

What is needed for combustion?

Ignition temperature

Complete 

combustion

Combustion products (oxides)

Element	Symbol	Name of oxide	Formula
Carbon	C	Carbondioxide
Hydrogen	H	Water
Sulphur	S	sulphurdioxide

CO​2​​

H​2​​O

SO​2​​

Complete combustion of methane

What are the three requirements for combustion?

1. Oxygen, gasoline and heat
2. Air, wood, lighter
3. Oxygen, fuel, temperature
4. Air, fuel, temperature

Combustion always forms:

1. Atoms
2. Fire
3. Oxides
4. Water

The combustion products of complete combustion of H2 are:

1. H2O
2. HO
3. HO2
4. CO2

The combustion products of complete combustion of  C₂H₅S are:

1. C, H, S
2. CO2, H2O, SO2
3. CO2, H2O
4. CO2, H2O, S

Combustion product in a complete combustion always contain the atom:

1. C
2. H
3. O
4. S

Incomplete 

combustion

Incomplete combustion 

of compound with 

C and H atoms

• Insufficient oxygen
• Yellow flame
  
• 
  
•       and             ( bit of            ) 

Complete combustion 

of compound with 

C and H atoms

• Enough oxygen
• Blue flame
•  
• 
  

H​2​​O

H​2​​O

CO​2​​

CO​2​​

CO

C

Incomplete combustion

Reaction equations 

incomplete combustion

complete combustion

Demo - Reagents

Reagent for water

Reagent for carbondioxide

Carbondioxide

Water

Sulfurdioxide

Starch

colourless Limewater
(becomes turbid)

White copper(II) sulfate
(white becomes blue)
Custard (white becomes yellow)

Iodine solution (brownyellow, becomes colourless)

Iodine solution
(brownyellow, becomes purple)

What is incomplete combustion?
A combustion with ........
oxygen

1. too much
2. insufficient
3. no
4. enough

What color becomes a flame with incomplete combustion?

1. yellow
2. blue

Has there been complete combustion?

1. yes
2. no

What type of reaction is this?

2C​8​​H​18​​+25O​2​​−>16CO​2​​+18H​2​​O

1. Seperation
2. Complete combustion
3. Decomposition reaction
4. Incomplete combustion

Ethanol + oxygen --> carbondioxide + carbon + water

This reaction is ...

1. Complete combustion
2. Incomplete combustion
3. No combustion