MIXTURE SEPARATION - Lesson 3

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

SPECIFIC OBJECTIVE: Recognize that all mixtures can be separated.

CONTENT







ENGAGE

Students, by now you should have known what a mixture is, the types of mixtures (solution, suspension, colloid) and the characteristics of each.
Quickly tell someone how well you are able to define each term.

👍 Great job if you were able to do that.


EXPLORE

Now, today we are going to look at an interesting topic. Firstly, I want you to recall what we did in the very first lesson on MIXTURES.

Do you remember this picture?



Ok I would like you to tell me how you think we could separate this mixture of sweets.

Of course we could simply just pick them out according to colours and place them on separate plates. Now this process is what we call hand separation or manual separation.

Do you believe that every mixture can be separated this way? Think of some of the mixtures you did experiment on in both lessons 1 and 2.



Let's read this information below.



Would you say that hand picking was used here to separate the tea leaves from the liquid?
Of course not.
What was used here? Yes, a STRAINER.
Well by now you would have realized that mixtures can indeed be separated, but not all are separated the same way.

Can you think of another way in which a mixture can be separated?
I want you to watch the following video clip to learn of other ways in which mixtures can be separated.

Video clip 1 on how to separate mixtures.

Video clip 2 on ways to separate  mixtures

https://www.youtube.com/watch?v=L7ZQ0o1Gp5Y

EXPLAIN
Now boys and girls, can you now tell me:

• what is a mixture
• 5 ways in which mixtures can be separated
• explain what each method is

EXTEND
Look at this slide below. Do you see any other method that was not mentioned in the activities above?
I would like you to research what these are.


Look at the following methods as well for note taking.












EVALUATE

1. Look at all the pictures below. They all depict methods of separating mixtures. Write the method of separation beside each picture.

2. Complete this activity

3.

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

MIXTURES - Lesson 1

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


Specific Obj: By the end of the lesson, students should be able to:
     1.   Demonstrate that a mixture is made up of two or more       substances
   2.     Recognize that all mixtures can be separated
CONTENT

Why do we make mixtures? Mixtures have many uses: perhaps we are mixing ingredients to bake a cake, or mixing metals to make a really strong alloy. A cake is a mixture of ingredients, including flour, eggs and milk.

Many things around us occur naturally as mixtures: salty sea water, moist air, soil, compost, rocks (mixture of minerals) to name a few. Many mixtures are man-made, for instance; Coca Cola, paint, salad dressing and so forth.

KEY VOCABULARY:  mixture, filter, filtration, evaporation, sieving, decanting, solution, colloid, suspension


ENGAGE
 Students I want you to try to unscramble the letters in the box below. You may use  the picture below as a clue.

M   T  R    E  I  U  X

Well your answer should be MIXTURE.
What do you think a mixture is?

How does it look?

Were you able to separate the contents you used all the time?

Did any change of colour occur?

If we are baking a cake, do we have to mix ingredients together?

EXPLORE:

(Students, I want you to get the following materials now:  1 tsp sugar, 2 tsp cooking oil, some small stones, some marbles and some water. You will also need 4 clear drinking glasses- 1/2 glass of water in each).

Ok we are going to explore what mixture is, but first, I want you to carry out some simple experiments.
1. Mix the following materials together and record what you observe. Sort the items mixed as solid-solid, solid-liquid or liquid-liquid (eg. Sugar and water is a mixture of solid and liquid).
 (A) Sugar and water
 (B) oil and water
 (C) stones and marbles

 (D) sand and rice 

Watch the video clip to lean more about mixtures.

EXPLAIN
How would you define the term mixture?

What have you noticed in each experiment?

Did all materials react the same way in the water?

EXTEND: 

Read the following to glean additional information.

EVALUATE:
1. Write a simple definition for mixture.
2. Name at least 3 types of mixtures.
3. Complete the activity in this link.
4. Complete this one.

https://www.ecosystemforkids.com/4th-grade/mixtures/mixtures.pdf