Lesson Plan of Difference between Solutions and Suspensions General Science Grade VI

Lesson Plan of Difference between Solutions and Suspensions

General Science Grade VI

Students’ Learning Outcomes

·         Identify solute and solvent in a solution.

·         Difference between solute, solvent and solution.

·         Difference between solutions and suspensions.

·         Identify uses of solutions and suspensions in daily life.

Information for Teachers

Concept Map

·         When two or more than two substances are mixed in such a way that no new substance is formed, the resulting substance is called a mixture.

·         Mixture is either homogeneous or heterogeneous.

·         Homogeneous: The mixture having uniform composition is called the homogeneous mixture (mixture of sugar in water).

·         Heterogeneous: The mixture having non-uniform composition is called the heterogeneous mixture (mixture of sand in iron, mixture of oil in water).

·         A solution is a homogeneous mixture, which contains one, or more solutes dissolved in a solvent. Solution has particle size 1 nm or smaller in diameter. Solution is the substance that dissolves in the solvent & it is present in small amount in the solution e.g. salt, sugar, etc. solvent is the substance in which solute dissolves and it is present in large quantity in the solution. e.g. water, petrol, acetone etc.

·         A suspension is a heterogeneous mixture of two or than two substances. (Sand in water). Suspension particles are more than 100 nm in diameter.

·         Colloid is a mixture that is intermediate between homogeneous & heterogeneous mixtures. (Foam, gel, smoke, milk). They have particle size between 1nm and 100nm.

                                                                            Solution & Suspension

Similarity
Both are mixtures
Differences
Solutions	Suspension
Homogeneous	Non-homogeneous
Solute separates by itself in solvent	Solute doesn’t by itself from solvent
No residue after filtration	Residue after filtration

Material / Resources

Beaker, sugar, salt, tea spoons, soil, glucose, and water

Worm up activity

·         Write the word, “mixture”, inside a box drawn on board and ask students to give their ideas about it. You may get a kind of response from the students as shown below. Write their ideas on board around the mixture box.

(Brainstorming)

Development

Activity 1

Divide students in groups and instruct them to:

·         Half fill a beaker with water, add half teaspoon of salt in it and stir.

·         Half fill another beaker with water, add half teaspoon of sugar in it and stir.

·         Observe the mixtures in both the beakers.

·         now ask the following questions:

o   Can you see the salt in water?

o   Can you see the sugar in water?

o   Where did they go?

o   Can you separate them? (if yes, then how?)

·         After taking students responses tell them that salt & sugar are solutes that dissolve in water to give solution. Tell them the definitions of solute, solvent and solution.

Activity 2

Divide students in small groups and instruct them to:

·         dissolve a small amount of glucose in water and stirs

·         img

·         Now ask the following question:

o   What is the result of the experiment?

o   What is solute in the solution?

o   What is solvent in the solution?

·         After getting their responses tell them that glucose is salute & water is solvent.

Activity 3

Divide the students in groups and instruct them to:

·         Take two beakers, label them A and B.

·         Half fill the two beakers with water.

·         Add one teaspoon of salt in beaker A.

·         Add one teaspoon of soil in beaker B.

·         Stir the two mixtures for a while.

·         img

Now ask the following questions:

o   How are two mixtures different from one another?

(Expected response: Mixture A is solution and B is a suspension.

o   Give one example of solution and suspension?

(Expected response: Solution; Glucose in water Suspension; Chalk in water)

o   Which of the following techniques could be used to separate the mixture A?

a)      Decantation

b)      Filtration

c)       Evaporation

d)      Distillation

(Expected response: Evaporation)

o   Which of the following techniques could be used to separate the mixture B?

a)      Decantation

b)      Filtration

c)       Evaporation

d)      Distillation

(Expected response: Filtration)

After getting students responses explain them the difference between solutions & suspensions. also explain the meanings of these four mixture separating techniques i.e. decantation, filtration, evaporation, and distillation.

Sum up / Conclusion

Conclude lesson by telling children that we leant.

·         Homogeneous mixtures are called solution.

·         Solution can be in any physical state e.g. alloy is a solid-solid solution of metals.

·         Upon filtration solution don’t leave residue but suspensions leave residue.

Assessment

·         Take a paper and make 6 paper strips out of it. (prepare 6 strips for each group)

·         write properties of solutions and suspensions on these paper strips, (one property or example per paper strip)

·         Distribute the strips among the groups.

·         Ask students to separate the solution and suspension strips from one another.

Follow up

·         Ask students to think and discuss about the phrase “Shake well before use”. Tell them that this sentence is usually written on certain medications. Why do you think it is important to shake well before using any such medication?