This document describes an experimental activity on chromatography of food dyes for a 5th grade level. It involves using chromatography to separate mixtures of food dyes on filter paper. Students will observe as the salt water rises up the filter paper, separating the dye mixtures. For the green dye, they will see it separates into its yellow and blue components. The conclusion discusses the key aspects of chromatography learned, including how it is used to separate components of mixtures and identify pure substances.

1. CHARLINE PINET FONTENIAUD
MY PROJECT
TEACHING PRESENTATION
2012-2013 EFTIS_M1 ENGLISH FOR SCIENCE TEACHERS

2. EXPERIMENTAL ACTIVITY : CHROMATOGRAPHY
OF FOOD DYES.
 Level : fifth
1

3. EXPERIMENTAL ACTIVITY : CHROMATOGRAPHY
OF FOOD DYES.
 Level : fifth
 Part A of the program : homogeneous
mixtures and pure substances.
1

4. EXPERIMENTAL ACTIVITY : CHROMATOGRAPHY
OF FOOD DYES.
 Level : fifth
 Part A of the program : homogeneous
mixtures and pure substances.
 Skills and knowledge studied
1

5. INTRODUCTION
 Chromatography
2

6. INTRODUCTION
 Chromatography
2

7. INTRODUCTION
 Chromatography
2

8. INTRODUCTION
 Chromatography
 Material
2

9. INTRODUCTION
 Chromatography
 Material
2

10. INTRODUCTION
 Chromatography
 Material
2

11. INTRODUCTION
 Chromatography
 Material
2

12. INTRODUCTION
 Chromatography
 Material
2

13. INTRODUCTION
 Chromatography
 Material
2

14. CONDUCT OF THE ACTIVITY
Time Part of the teacher Part of students
Distributes the document to the students,
5 min Read the document.
introduce the activity.
Presents the material, helps students depositing Preparing the filter paper and elution begins (by
10 min
drops of dye on the filter paper. placing the filter paper in salt water).
Pass among groups to give the main rule of Observed salt water "rises" on the filter paper, all
10 min
chromatography : do not move beaker ! notes observations.
Helps students exploit the chromatogram and Placed filter paper in a stove, answer questions
15 min
answer questions. from the sheet.
3

15. CONDUCT OF THE ACTIVITY
Time Part of the teacher Part of students
Distributes the document to the students,
5 min Read the document.
introduce the activity.
Presents the material, helps students depositing Preparing the filter paper and elution begins (by
10 min
drops of dye on the filter paper. placing the filter paper in salt water).
Pass among groups to give the main rule of Observed salt water "rises" on the filter paper, all
10 min
chromatography : do not move beaker ! notes observations.
Helps students exploit the chromatogram and Placed filter paper in a stove, answer questions
15 min
answer questions. from the sheet.
40 min
3

16. SHEET
FOR
STUDENTS
4

17. SHEET
FOR
STUDENTS
 Experience
4

18. SHEET
FOR
STUDENTS
 Experience
 Question
4

19. ANSWERS
5

20. ANSWERS
 What happens between salt water and the paper filter ?
5

21. ANSWERS
 What happens between salt water and the paper filter ?
 The water rises along the filter paper causing the dye
5

22. ANSWERS
 What happens between salt water and the paper filter ?
 The water rises along the filter paper causing the dye
 Have you separate components during this experience?
Explains. Give the separated components.
5

23. ANSWERS
 What happens between salt water and the paper filter ?
 The water rises along the filter paper causing the dye
 Have you separate components during this experience?
Explains. Give the separated components.
 Only the green dye is separated into two distinct tasks : yellow
and blue
5

24. ANSWERS
 What happens between salt water and the paper filter ?
 The water rises along the filter paper causing the dye
 Have you separate components during this experience?
Explains. Give the separated components.
 Only the green dye is separated into two distinct tasks : yellow
and blue
 The green dye is not a pure substance
5

25. CONCLUSION
6

26. CONCLUSION
« chromatography »
6

27. CONCLUSION
« chromatography »
« separate components »
6

28. CONCLUSION
« chromatography »
« separate components »
« homogeneous mixture »
6

29. CONCLUSION
« chromatography »
« separate components »
« homogeneous mixture »
« eluent »
6

30. CONCLUSION
« chromatography »
« separate components »
« homogeneous mixture »
« eluent »
« pure substance »
6

31. CONCLUSION
« chromatography »
« separate components »
« homogeneous mixture »
« eluent »
« pure substance »
« several tasks »
6

32. THANK YOU FOR YOUR ATTENTION
7
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http://media.education.gouv.fr/file/special_6/52/7/Programme_physique-chimie_33527.pdf