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