4.1 combustion

• Science
• Middelbare school
• vwo
• Leerjaar 3

4.1 combustion

you will learn

- to recognise a combustion reaction, the tree conditions for combustion and how you can prevent or fight a fire

- the difference between complete and incomplete combustion and which reaction products are formed

- to write a chemical equation of a combustion reactrion  

three conditions for a combustion

• combustible substance
• oxygen
• combution temperature

fire triangle

How to fight to fire?

• Water
• Foam 
• take away fuel
• etc. 

Water to fight a fire

lowers temperature

takes away oxygen

very effective but not always useful

take away fuel

firebreak in a forest 

you can prevent or fight a fire by remoring at least one of teh three conditions for combution.

Oxides

an oxide is a compound between oxygen and the element that was burned.

Reaction equation for a combustion

Always 2 reactants:

- oxygen - O2

- combustible substance

A (..) +        (g) -> A,O (s)

O​2​​

combustion

A  +                                       ->  A,O

or

A, B   +            -> A,O + B,O

O​2​​

O​2​​

(in)complete combustion

complete combustion: enough oxygen to burn all the fuel

incomplete combustion: not enough oxygen to burn all the fuel

(in)complete combustion

Which substances are formed in complete combustion of
carbon mono sulfide (CS)?

1. H​2​​O.....CO​2​​
2. C.....S
3. CO​2​​​​​.....SO​2​​
4. CO.....SO​2​​

Reagent

a substance with which you can identify another substance 

reagents

What is reagent for water?

1. iodine water
2. clear chalkwater
3. white coppersulphate

Make balanced equation for the complete combustion of

Add phases (g), (l), (s), (aq)!

C​3​​H​8​​

Reagent for carbon di oxide is...

1. white coppersulphate
2. bromine water
3. clear chalkwater

home work

read par 4.1 and do questions par 4.1