Separating Mixtures through Decantation.pptx

Separating Mixtures through Decantation

1. Separating Mixtures through Decantation liquid and insoluble solid mixtures

2. A Problem A-RICE! Have you tried cooking rice? How did you do it ?

3. A Problem A-RICE!

4. A Problem A-RICE! What are the processes involved? Why do we Need to wash the rice ?

5. A Thought A-RICE! Sometimes, it is necessary to separate the different components of a mixture. For example - in cooking rice: impurities need to be removed before cooking it.

6. Group Activity: Let It Sink & Separate! rules for the group work 1. Have respect for each other. 2. All group members should do an equal amount of work. 3 . Time management. 4. Be willing to cooperate with others on their ideas. 5. Effective communication.

7. Group Activity: Let It Sink & Separate! I. LESSON CONCEPT: Decantation is the “pouring off” of a liquid from a solid-liquid mixture. The solid component is allowed to settle at the bottom (sedimentation), and the liquid is removed (poured off) while preventing the solid from escaping.

8. Group Activity: Let It Sink & Separate! II. MATERIALS : 2 Clear Glasses spoon Timer Sand Water ruler

9. Group Activity: Let It Sink & Separate! III. PROCEDURES: 1. Gather all the needed materials. 2. Place two heaped tablespoons of sand into one glass and half fill with water. 3. Mix the sand and water. 4. Leave the water to settle for 1 minute.

10. Group Activity: Let It Sink & Separate! 5 . then attempt to pour off only clean water into the other glass. 6. Stop when the water starts to become cloudy (translucent). 7. Measure and record the height of the water.

11. Group Activity: Let It Sink & Separate! 8 . Repeat the activity increasing the time left for the sediment to settle. 8. Record your observation in the table . 9. Be ready to report your findings to the class.

12. Group Activity: Let It Sink & Separate! Table 1: Water and Sand Time to settle Height of clear water Clearness of Water 1 minute     3 minutes     5 minutes    

13. Group Activity: Let It Sink & Separate! IV. GUIDE QUESTIONS : 1. Can the solid particles be separated from water right after mixing without letting it settle at the bottom of the container?

14. Group Activity: Let It Sink & Separate! IV. GUIDE QUESTIONS : 2. Did waiting a longer time improve the clarity of water? Why?

15. Group Activity: Let It Sink & Separate! IV. GUIDE QUESTIONS : 3. Do you think water becomes potable after decanting? Why?

16. Group Activity: Let It Sink & Separate! IV. GUIDE QUESTIONS : 4. What could water be used for after decanting?

17. Group Activity: Let It Sink & Separate! GROUP PRESENTATION Read the RUBRICS FOR GROUP PRESENTATION

18. Decantation Decantation is the “pouring off” of a liquid from a solid-liquid mixture. The insoluble solid component is allowed to settle at the bottom ( sedimentation ), and the liquid is removed ( poured off ) while preventing the solid from escaping .

19. Decantation Processes evolved: Sedimentation – allowing the mixture to stand so that gravity has time to pull the solid to the bottom of a container.

20. Decantation Sedimentation :

21. Decantation Sedimentation Using gravity only works when the solid is more dense than the liquid . Allowing more time for the solid materials to settle will produce a clearer liquid.

22. Decantation Processes evolved: pouring – after the solid particles settled down at the bottom, the liquid is removed by pouring it off while preventing the solid from escaping.

23. Decantation pouring:

24. Let’s Recall What is Decantation? What are the processes involved?

25. Evaluation Draw/Illustrate the process of decantation. Label your illustrations.

26. Evaluation Complete the table below . Mixtures Put a √ if they can be separated through decantation and X if not. Sand and water   Alcohol and water   Mud and water   Vinegar and soysauce   Peebles and water  

27. Assignment bring the following materials: 1 . Clear glass or cup container 2. Tray 3. Cooking oil 4. Kerosene 5. Soy sauce 6. Vinegar