How can we purify water?
In order to acomplish the 6th goal of the millenium, students will do a research about different ways to purify water and they will design a method. Then, they will test it, analysing different properties of water, and decide which designed method is the best.
1.Design a method to purify water.
2. Analyse different properties of water before and after being purified and relate it to its purity.
3.Compare the different designed methods and justify which is the best one. Question themselves if it would be healthy to drink the water resulting on the designed purifying method.
4.Record and edit a video in order to show to the classmates the designed method to purify water.
Objectives
Contents
Contents
Pure substances and mixtures.
Separation methods.
Properties of water.
Process and activities
1. Quizzlet to review the main vocabulary related to pure substances and mixtures.
2. Make a glossary with the words they think will need to do the project.Glossary
3. Kahoot to show to the students different ideas to design the method. They have to identify the separation technique and procedure used to purify water.Kahoot
4. Students (in groups of three) choose one of the methods shown or propose a new one. Ground rules to work in groups. Traffic light activity
5. Complete a template with the principal characteristics of the method.
6 Students make observations and measure different magnitudes related to the sample of water that has to be purified.
7. Complete a template about the sample of water that has to be purified.
Properties of water.. before and after being purified
8. Design and test the method in the lab.
9. Record the 1st part of the video: Show and explain how the method works.
10. Analyse a sample of water purified using the ‘water purity tester kit’ provided by the teacher. Students have to test bacteria growth, Tyndall effect, evaporation test and pH level.
11. Record the 2nd part of the video: Show and explain the differences between the water before and after being purified.
12. Edit the video merging both parts and making it attractive to show to classmates.
13. Presentation of the videos to the classmates.
14. Students complete a rubric to decide which of the methods is the best.
..and the final product: The videos
