MIXTURES (Solutions, suspensions, colloids) - Lesson 2

FOCUS QUESTION: What is a mixture and how can mixtures be separated?

SPECIFIC OBJECTIVE: 

1.       Classify mixtures as solutions, suspension and colloids

CONTENT







ENGAGE:

Students, I need you to recall what the definition for mixture is based on our last lesson.
How can mixture be defined?
Are all mixtures the same?
Explain your answer using the experiments you performed in the last lesson.

I need you to get your note books ready. We will be learning today about the different types of mixtures, and their characteristics. For this lesson, you will need the following:

3 clear glasses of water
1 tsp salt
1/4 cup flour
1 glass of milk (you may use dry milk)
a flashlight
1 cup garden soil


EXPLORE:


Add water to each of the substances you have secured: (salt, flour, milk) and stir for two minutes. Describe the appearance of the resulting mixture in writing . Share this observation with the class, and in a teacher-led discussion.
For the garden soil, just examine what it is made of. (do not add water to this). Just examine it and determine if it could be considered a mixture just as it is. What does it comprise/made up of?

Based on the experiment, under which heading would you place each activity? Quickly place them on the correct heading. I have done one for you.


Liquid & Liquid                                 Solid & Solid                            Solid  & Liquid

                                                              garden soil


Now let's see what your mixtures look like.



Now you can arrange the glasses in rows, shine the flashlight on the glasses and demonstrated below.



garden soil


A mixture of a solid and a solid – tell what it comprise.
What would you call this mixture? Solution, suspension or colloid


Now I want you to watch this video clip to glean additional information about solutions, suspensions and colloids.


Look at this second video clip.
https://www.youtube.com/watch?v=UktHPe4oQLc


EXPLAIN

Now students, you are going to explain what you have learnt from the lesson. Can you now define the following?

• mixture
• solution
• suspension
• colloid

EXTEND

Watch this slide show for additional information.

Examine these charts for further note taking.










EVALUATE

ACTIVITY # 1