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Lesson 4.2.2 The Halogens
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Slide 1:
Diapositive
Chem
Secondary Education
Age 13
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Slide 1 - Diapositive
Today's Lesson Goals
identify the key terms about halogens
formulate a hypothesis
analyse experimental data about the properties of halogens
formulate a conclusion based on the analysis
Slide 2 - Diapositive
timer
4:00
Slide 3 - Diapositive
Scientific Demonstration
Slide 4 - Diapositive
Enquiry question: Would you expect bromine to be more reactive than chlorine?
Slide 5 - Question ouverte
Experiment Results
Slide 6 - Diapositive
Understanding key concepts
Slide 7 - Diapositive
Are halogens metals or non-metals?
YES
NO
Slide 8 - Sondage
Slide 9 - Diapositive
What is the trend in melting points in Group 7? The melting point _______ from top to bottom.
Slide 10 - Question ouverte
What is the trend in color in Group 7?
A
dark to light
B
light to dark
C
no difference
Slide 11 - Quiz
What is the trend in boiling points in Group 7? The boiling point _______ from top to bottom.
Slide 12 - Question ouverte
What would predict about the boiling point and melting point of iodine, the next element in Group 7?
A
lower
B
higher
C
same as bromine
Slide 13 - Quiz
Iodine to be _________________ than bromine.
more reactive
less reactive
Slide 14 - Sondage
Slide 15 - Diapositive
The electronic structure for bromine is missing from the table. How many electrons do you predict will be in the outer shell?
A
5
B
6
C
7
D
8
Slide 16 - Quiz
What happens to the size of the atoms as you go down group 7?
A
become smaller
B
become bigger
C
all of the same size
D
disappear
Slide 17 - Quiz
Slide 18 - Diapositive
What similarity is there in the structure of these atoms?
A
1 electron in the outer shell
B
same number of shells
C
7 electrons in the outer shell
D
no similarity
Slide 19 - Quiz
Suggest why this group is called Group "7".
Slide 20 - Question ouverte
Slide 21 - Diapositive
Collaborative Work
timer
5:00
Slide 22 - Diapositive
timer
5:00
Slide 23 - Diapositive
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