2.2 Periodic table

Periodic table and molecular formulas
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Slide 1: Diapositive
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Periodic table and molecular formulas

Slide 1 - Diapositive

Learning goals
At the end of the lesson you:
  • Know the name of 40 atoms and their symbols
  • Can write a chemical formula
  • Know the name of 40 elements and their formulas
  • Know the name of 17 compounds and their formulas
  • Know the place and name of four groups in the periodic table
  • Know that groups in the periodic table have similar properties

Slide 2 - Diapositive

Periodic Table of Elements
  • 1869: Dimitri Mendelejev
  • Elements ordered by mass and similar poperties
  • Predicted non-discoverd elements 

Slide 3 - Diapositive

Slide 4 - Diapositive

Symbols

Each kind of atoM has its own symbol.

First letter always capital letter.

Second letter always a

lower case letter


H  = hydrogen
He = helium

Slide 5 - Diapositive

Special groups
Group 1: Alkali metals

Group 2: Alkanline earth metals
Group 17: Halogens
Group 18: Noble gasses


Slide 6 - Diapositive

Molecular formula

Atoms shown as spheres with symbol




Cl
H
H
O
O
C
C
O
H

Slide 7 - Diapositive

Molecular formula


CO2                                                                                                          







 




C
O
O
H
H
O
Index: shows the number of atoms (at the bottom right of the symbol)
H2O

Slide 8 - Diapositive

Molecular formula

Multiple molecules are shown with the coëfficiënt. This number comes before the molecar formula.



C
O
O
C
C
C
C
O
O
O
O
O
O
O
O

The coëfficiënt is 5, so 5CO2

Slide 9 - Diapositive

What was the basis of the order Mendelejev used for the known elements?
A
Color
B
Mass
C
Date of discovery
D
Name

Slide 10 - Quiz

What do elements in the same group have in common?
A
Mass
B
Date of discovery
C
Chemical properties
D
Being metal or non-metal

Slide 11 - Quiz

How many atoms do you see?
A
5
B
10
C
15
D
0

Slide 12 - Quiz

How many kind of atoms do you see?
A
3
B
2
C
5
D
0

Slide 13 - Quiz

How many molecules do you see?
A
15
B
2
C
5
D
1

Slide 14 - Quiz

Wat is the coëfficient in the following formula?

3CH4
A
4
B
1
C
3
D
0

Slide 15 - Quiz

How many H-atoms are there in the following formula?

3CH4
A
4
B
1
C
3
D
12

Slide 16 - Quiz

Give out List of substances

Assign test of List of substances

Slide 17 - Diapositive

Making exercises
Make 16+20 (10 min in silence)
Finished? Make 14, 15, 17 - 19, 21, 22, 24- 26

Slide 18 - Diapositive

Making exercises
Make 22+24 (10 min in silence)
Finished? Make 14, 15, 17 - 19, 21, 25, 26

Slide 19 - Diapositive

Reflection
At the end of the lesson you:
  • Know the name of 40 atoms and their symbols
  • Can write a chemical formula
  • Know the name of 40 elements and their formulas
  • Know the name of 17 compounds and their formulas
  • Know the place and name of four groups in the periodic table
  • Know that groups in the periodic table have similar properties

Slide 20 - Diapositive