# 2.3 Balancing reaction equations

What do you know about balance?
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Slide 1: Woordweb
ScheikundeMiddelbare schoolvwoLeerjaar 3

In deze les zitten 16 slides, met interactieve quizzen en tekstslides.

Lesduur is: 40 min

## Onderdelen in deze les

What do you know about balance?

#### Slide 1 -Woordweb

Learning goals
At the end of the lesson you can:
• Balance a chemical equation

#### Slide 2 -Tekstslide

Balance
Atoms
left and right

index not, coëfficiënt yes
don't write 1

#### Slide 3 -Tekstslide

Step 1 Reaction equation
Aluminiumoxide -> aluminium + oxygen
Al2O3 -> Al + O2

#### Slide 4 -Tekstslide

Step 2 Count atoms
Aluminiumoxide -> aluminium + oxygen
Al2O3 -> Al + O2
Al
2
Al
1
O
3
O
2

#### Slide 5 -Tekstslide

Step 3 Right and left equal (1)
Aluminiumoxide -> aluminium + oxygen
Al2O3 -> 2 Al + O2
Al
2
Al
2
O
3
O
2

#### Slide 6 -Tekstslide

Step 3 Right and left equal (2)
Aluminiumoxide -> aluminium + oxygen
Al2O3 -> 2 Al + 1.5 O2
Al
2
Al
2
O
3
O
3

#### Slide 7 -Tekstslide

Stap 3 Whole numbers
Aluminiumoxide -> aluminium + oxygen
2 Al2O3 -> 4 Al + 3 O2
Al
4
Al
4
O
6
O
6

#### Slide 8 -Tekstslide

Is this reaction balanced?
A
Yes
B
No

#### Slide 10 -Quizvraag

Make the reaction equation balanced.

2P+3Cl2......PCl3
A
1
B
2
C
3
D
4

#### Slide 11 -Quizvraag

What is the balanced equation?
A
CH4(g)+O2(g)CO2(g)+H2O(l)
B
CH4(g)+O2(g)CO2(g)+2H2O(l)
C
CH4(g)+2O2(g)CO2(g)+H2O(l)
D
CH4(g)+2O2(g)CO2(g)+2H2O(l)

#### Slide 12 -Quizvraag

What is the balanced equation?
A
Fe2O3(s) + C(s) --> Fe(l) + CO2(g)
B
Fe2O3(s) + 2 C(s) --> 2 Fe(l) + 2 CO2(g)
C
2 Fe2O3(s) + 3 C(s) --> 4 Fe(l) + 3 CO2(g)
D
3 Fe2O3(s) + 4 C(s) --> 6 Fe(l) + 4 CO2(g)

#### Slide 13 -Quizvraag

Making exercise
Make 34a-c (10 min in silence)
Finished? Make 27, 28, 29, 34d - l

#### Slide 14 -Tekstslide

Making exercise
Make 34d - l (10 min in silence)
Finished? Make 27, 28, 29

#### Slide 15 -Tekstslide

Reflection
At the end of the lesson you can:
• Balance a chemical equation